The studies on the synthesis of two-dimensional(2D)Janus materials have made significant progress over the years.They offer new opportunities to increase the potential usage of Janus transition metal dichalcogenide(TM...The studies on the synthesis of two-dimensional(2D)Janus materials have made significant progress over the years.They offer new opportunities to increase the potential usage of Janus transition metal dichalcogenide(TMDC)materials in different application areas due to their unique structural,electrical,optical and mechanical properties.However,the difficulties in synthesizing these materials stand out as a critical factor for further research in this field.This manuscript aims to provide a comprehensive overview of this rapidly developing field by reviewing studies in which Janus TMDC structures have been experimentally obtained.Within the scope of the research,the synthesis methods such as chemical vapor deposition(CVD),pulsed laser deposition(PLD),selective epitaxial atomic replacement(SEAR),plasma-assisted selenization process(PASP)and room temperature atomic layer selenization(RT-ALS)have been handled in detail.The analysis results obtained by various characterization methods such as Raman spectroscopy,photoluminescence(PL),atomic force microscopy(AFM),Kelvin probe force microscopy(KPFM),transmission electron microscopy(TEM),scanning electron microscopy(SEM),X-ray photoelectron spectroscopy(XPS),piezoelectric properties,mechanical properties and second harmonic generation(SHG)have been looked into.Moreover,the kinetic mechanisms of the synthesis processes have been particularly discussed so that the synthesis processes of the materials can be optimized and more controlled synthesis techniques can be developed.As a result of literature review,we can conclude that Janus TMDC structures should have a much wider range of applications despite the difficulties in their synthesis and novel strategies should be developed to synthesize new kind of Janus materials.展开更多
At present,many parts of the world are seriously short of water resources.Photothermal seawater desalination has been considered to be an efficient and clean way to solve water shortages.Transition metal dichalcogenid...At present,many parts of the world are seriously short of water resources.Photothermal seawater desalination has been considered to be an efficient and clean way to solve water shortages.Transition metal dichalcogenides(TMDs)has excellent photothermal properties and plays a key role in photothermal seawater desalination.In recent years,a lot of progress has been made regarding TMDs in photothermal seawater desalination,so it is necessary to review the progress of TMDs structure regulation in improving photothermal properties to further enhance the development of this filed.In this review,firstly,various structural regulation methods of TMDs to optimize its properties and improve the performance of photothermal seawater desalination are comprehensively summarized.Secondly,the relationship between unique structure and its photothermal properties of TMDs is further detailedly discussed.Last but not least,we have provided some suggestions in the solar desalination applying TMDs in future.This review would provide a very important reference for the research of structure regulation of TMDs for effective photothermal seawater desalination.展开更多
Hydrogen evolution reaction(HER)plays a crucial role in developing clean and renewable hydrogen energy technologies.However,conventional HER catalysts rely on expensive and scarce noble metals,which is a significant c...Hydrogen evolution reaction(HER)plays a crucial role in developing clean and renewable hydrogen energy technologies.However,conventional HER catalysts rely on expensive and scarce noble metals,which is a significant challenge for practical application.Recently,twodimensional transition metal dichalcogenides(2D-TMDs)have emerged as attractive and cost-effective alternatives for efficient electrocatalysis in the HER.Substantial efforts have been dedicated to advancing the synthesis and application of 2D-TMDs.This review highlights the design and synthesis of high-performance 2D-TMDs-based HER electrocatalysts by combining theoretical calculations with experimental methods.Subsequently,recent advances in synthesizing different types of 2D TMDs with enhanced HER activity are summarized.Finally,the conclusion and perspectives of the 2D TMDs-based HER electrocatalysts are discussed.We expect that this review will provide new insights into the design and development of highly efficient 2D TMDs-based HER electrocatalysts for industrial applications.展开更多
Layered transition metal dichalcogenides(TMDs)have emerged as promising electrode materials for supercapacitors due to their high theoretical specific capacitance,unique layered structure,large surface area,and tunabl...Layered transition metal dichalcogenides(TMDs)have emerged as promising electrode materials for supercapacitors due to their high theoretical specific capacitance,unique layered structure,large surface area,and tunable energy band structure.Substantial progress has been made in the development of TMDs for supercapacitors,with several great breakthroughs reported.However,the practical application of TMDs is still hindered by several challenges,including their susceptibility to oxidation,the tendency to restack or aggregate,structural instability,and interior electrical conductivity.To overcome these limitations,the construction of heterostructures has been identified as an effective strategy.By modulating the interface structure between different components,heterostructures can enhance overall structural stability and facilitate faster ion transport,thereby improving the efficiency of supercapacitors.This review provides a comprehensive overview of recent advances in TMD-based heterostructures for supercapacitors,focusing on their synthesis methods,the relationship between structure,properties,and electrochemical performance,as well as existing challenges.Particular emphasis is placed on hetero structure engineering strategies that integrate TMDs with materials of various dimensionalities(0D,1D,2D,and 3D)to enhance their electrochemical performance for supercapacitors.Finally,the review discusses critical challenges and outlines future perspectives that may guide the development of TMDs for supercapacitors and beyond.展开更多
Extensive first-principles calculations have been performed to examine the electrochemical properties of Na-ion-intercalatable heterostructures formed by transitional metal dichalcogenides(MS_(2),where M=Ti,V,Nb and M...Extensive first-principles calculations have been performed to examine the electrochemical properties of Na-ion-intercalatable heterostructures formed by transitional metal dichalcogenides(MS_(2),where M=Ti,V,Nb and Mo)and blue phosphorus(BlueP),which have been reported as potential anode materials for rechargeable sodium-ion batteries.Upon formation of heterostructures,much improved structural stabilities have observed compared with the pristine MS_(2) and BlueP.Metallic T-TiS_(2),T-MoS_(2),H(T)-VS_(2) and H(T)-NbS_(2) would retain the conductive character after formation of heterostructures with BlueP,however,HTiS_(2)/BlueP and H-MoS_(2)/BlueP would undergo a semiconductor to metallic transition accompanied by Na intercalation.Moreover,the presence of relatively low diffusion barriers ranging from 0.04 eV to 0.08 eV,coupled with the suitable average open-circuit voltage spanning from 0.12 eV to 0.89 eV,guarantee exceptional charge-discharge rates and ensure the safety of battery performance.Among these heterostructures,H(T)-NbS_(2)/BlueP and T-TiS_(2)/BlueP exhibit best Na adsorption ability of up to 4 layers,corresponding to theoretical capacities of 570.2 and 746.7 mAh/g,respectively.These encouraging properties indicate that T-TiS_(2)/BlueP and H(T)-NbS_(2)/BlueP could serve as suitable anode materials for high-performance sodiumion batteries.展开更多
The thermal conductivity of two-dimensional transition metal dichalcogenides(TMDs)materials is significantly reduced compared to bulk materials due to the quantum size effect,which renders them highly application prom...The thermal conductivity of two-dimensional transition metal dichalcogenides(TMDs)materials is significantly reduced compared to bulk materials due to the quantum size effect,which renders them highly application promising as thermoelectric materials.Here,we employ first-principles methods combined with the non-equilibrium Green's functional formalisms(NEGF-DFT)to reveal the impact of pressure on the thermoelectric performance of monolayer,bilayer and heterostructure TMDs(2H-MoS_(2),2H-WS_(2)and MoS_(2)@WS_(2))materials.The thermoelectric performance of monolayer and heterostructure is significantly enhanced under specific low pressure,and the figure of merit(ZT)of monolayer MoS_(2)and WS_(2)can reaching up to 2.79 and 2.68 at 700 K.Conversely,for bilayer materials,pressure led to a decrease in ZT.The simultaneous discovery of a unique phenomenon in Mobased TMDs materials is that they can undergo transformation from N-type to P-type thermoelectric materials with high electrical conductivity under higher pressure.This is because the pressure causes different effects on the carrier motion at different high symmetry points.Additionally,another bilayer stacking mode is constructed,which successfully surpasses the thermoelectric performance of traditional bilayer MoS_(2)by a specific pressure.This study shows a method to enhance the thermoelectric performance,and more importantly provides a theory that can predict the effect of pressure on the thermoelectric performance of all structures constructed from TMDs materials.展开更多
Two-dimensional(2D)transition metal dichalcogenides(TMDs),endowed with exceptional light-matter interaction strength,have become a pivotal platform in advanced optoelectronics,enabling atomically precise control of ex...Two-dimensional(2D)transition metal dichalcogenides(TMDs),endowed with exceptional light-matter interaction strength,have become a pivotal platform in advanced optoelectronics,enabling atomically precise control of excitonic phenomena and offering transformative potential for engineering next-generation optoelectronic devices.In contrast to the narrowband absorption characteristics of conventional band-edge excitons,which are limited by the bandgap energy,highenergy excitons not only demonstrate broad momentum matching capability in the ultraviolet regime due to band nesting effects,but also exhibit distinct absorption peak signatures owing to robust excitonic stabilization under 2D confinement.These unique photophysical properties have established such systems as a prominent research frontier in contemporary exciton physics.This review primarily outlines the distinctive physical characteristics of high-energy excitons in TMDs from the perspectives of band structure,excitonic characteristics,and optical properties.Subsequently,we systematically delineate cutting-edge developments in TMD-based photonic devices exploiting high-energy excitonic band-nesting phenomena,with dedicated emphasis on the strategic engineering of nanoscale heterostructures for tailored optoelectronic functionality.Finally,the discussion concludes with an examination of the challenges associated with the design of high-energy exciton devices and their potential future applications.展开更多
Designing novel two-dimensional structures and precisely modulating their second harmonic generation(SHG)attributes are key to advancing nonlinear photonic technologies.In this work,through first-principles calculatio...Designing novel two-dimensional structures and precisely modulating their second harmonic generation(SHG)attributes are key to advancing nonlinear photonic technologies.In this work,through first-principles calculations,we propose a novel tetrahedral phase of transition metal dichalcogenides(TMDs)and validate its structural feasibility in a family of compounds,i.e.,ZX_(2)(Z=Ti,Zr,Hf;X=S,Se,Te).Cohesive energy and phonon dispersion calculations further demonstrate that eight of nine possible ZX_(2)monolayers are dynamically stable.All the ZX_(2)monolayers exhibit pronounced out-of-plane SHG with nonlinear susceptibility components reaching the order of 10^(2)pm/V.Strain engineering imposes a profound influence on the SHG response of ZX_(2)monolayers by reducing symmetry and modifying nonlinear susceptibility components.The redshift and significant enhancement of the prominent peak in SHG spectra are also revealed due to strain-induced charge redistribution and band gap reduction.Intriguingly,strain-driven nonlinear optical switching effects are realized in the ZX_(2)monolayers,with a reversible switching of SHG component ordering under tensile and compressive strain.In such a case,the anisotropic SHG pattern transforms from fourfold to twofold symmetry under the strain.Our work demonstrates the efficacy of strain engineering in precisely enhancing SHG,paving the way for the integration of novel TMD structures into tunable and flexible nonlinear optical devices.展开更多
Two-dimensional transition metal dichalcogenides(2D TMDCs)have received considerable attention in local strain engineering due to their extraordinary mechanical flexibility,electonic structure,and optical properties.T...Two-dimensional transition metal dichalcogenides(2D TMDCs)have received considerable attention in local strain engineering due to their extraordinary mechanical flexibility,electonic structure,and optical properties.The strain-induced out-of-plane deformations in 2D TMDCs lead to diverse excitonic behaviors and versatile modulations in optical properties,paving the way for the development of advanced quantum technologies,flexible optoelectronic materials,and straintronic devices.Research on local strain engineering on 2D TMDCs has been delved into fabrication techniques,electronic state variations,and quantum optical applications.This review begins by summarizing the state-of-the-art methods for introducing local strain into 2D TMDCs,followed by an exploration of the impact of local strain engineering on optical properties.The intriguing phenomena resulting from local strain,such as exciton funnelling and anti-funnelling,are also discussed.We then shift the focus to the application of locally strained 2D TMDCs as quantum emitters,with various strategies outlined for modulating the properties of TMDC-based quantum emitters.Finally,we discuss the remaining questions in this field and provide an outlook on the future of local strain engineering on 2D TMDCs.展开更多
Two-dimensional(2D)transition metal dichalcogenide(TMD)nanosheets have attracted considerable attention owing to their diverse properties and great potential in a wide range of applications.In order to further tune th...Two-dimensional(2D)transition metal dichalcogenide(TMD)nanosheets have attracted considerable attention owing to their diverse properties and great potential in a wide range of applications.In order to further tune their properties and then broaden their application domain,large efforts have been devoted into engineering the structures of 2D TMD nanosheets at atomic scale,especially the alloying technology.Alloying different 2D TMD nanosheets into 2D alloys not only offers the opportunities to fine-tune their physical/chemical properties,but also opens up some unique properties,which are highly desirable for wide applications including electronics,optoelectronics and catalysis.This review summarizes the recent progress in the preparation,characterization and applications of 2D alloyed TMD nanosheets.展开更多
Molecular dynamics simulations are performed to investigate the misfit straininduced buckling of the transition-metai dichalcogenide(TMD)lateral heterostructures,denoted by the seamless epitaxial growth of different T...Molecular dynamics simulations are performed to investigate the misfit straininduced buckling of the transition-metai dichalcogenide(TMD)lateral heterostructures,denoted by the seamless epitaxial growth of different TMDs along the in-plane direction.The Stillinger-Weber potential is utilized to describe both the interaction for each TMD and the coupling between different TMDs,i.e.,MX2(with M=Mo,W and X=S,Se,Te).It is found that the misfit strain can induce strong buckling of the freestanding TMD lateral heterostructures of large area,resulting from the TMDs'atomic-thick nature.The buckling phenomenon occurs in a variety of TMD lateral heterostructures of different compositions and in various patterns.Our findings raise a fundamental mechanical challenge for the structural stability of the freestanding TMD lateral heterostructures.展开更多
Transition metal dichalcogenides, featuring layered structures, have aroused enormous interest as a platform for novel physical phenomena and a wide range of potential applications. Among them, special interest has be...Transition metal dichalcogenides, featuring layered structures, have aroused enormous interest as a platform for novel physical phenomena and a wide range of potential applications. Among them, special interest has been placed upon WTe_2 and MoTe_2, which exhibit non-trivial topology both in single layer and bulk as well as pressure induced or enhanced superconductivity. We study another distorted IT material NbTe_2 through systematic electrical transport measurements. Intrinsic superconductivity with onset transition temperature(T_c^(onset)) up to 0.72 K is detected where the upper critical field(H_c) shows unconventional quasi-linear behavior,indicating spin-orbit coupling induced p-wave paring. Furthermore, a general model is proposed to fit the angledependent magnetoresistance, which reveals the Fermi surface anisotropy of NbTe_2. Finally, non-saturating linear magnetoresistance up to 50 T is observed and attributed to the quantum limit transport.展开更多
Transition metal dichalcogenides(TMDs)show great advantages in electromagnetic wave(EMW)absorption due to their unique structure and electrical properties.Tremendous research works on TMD-based EMW absorbers have been...Transition metal dichalcogenides(TMDs)show great advantages in electromagnetic wave(EMW)absorption due to their unique structure and electrical properties.Tremendous research works on TMD-based EMW absorbers have been conducted in the last three years,and the comprehensive and systematical summary is still a rarity.Therefore,it is of great significance to elaborate on the interaction among the morphologies,structures,phases,components,and EMW absorption performances of TMD-based absorbers.This review is devoted to analyzing TMD-based absorbers from the following perspectives:the EMW absorption regulation strategies of TMDs and the latest progress of TMD-based hybrids as EMW absorbers.The absorption mechanisms and component-performance dependency of these achievements are also summarized.Finally,a straightforward insight into industrial revolution upgrading in this promising field is proposed.展开更多
First-principle calculations with different exchange-correlation functionals, including LDA, PBE, and vd W-DF functional in the form of opt B88-vd W, have been performed to investigate the electronic and elastic prope...First-principle calculations with different exchange-correlation functionals, including LDA, PBE, and vd W-DF functional in the form of opt B88-vd W, have been performed to investigate the electronic and elastic properties of twodimensional transition metal dichalcogenides（TMDCs） with the formula of MX2（M = Mo, W; X = O, S, Se, Te） in both monolayer and bilayer structures. The calculated band structures show a direct band gap for monolayer TMDCs at the K point except for MoO2 and WO2. When the monolayers are stacked into a bilayer, the reduced indirect band gaps are found except for bilayer WTe2, in which the direct gap is still present at the K point. The calculated in-plane Young moduli are comparable to that of graphene, which promises possible application of TMDCs in future flexible and stretchable electronic devices. We also evaluated the performance of different functionals including LDA, PBE, and opt B88-vd W in describing elastic moduli of TMDCs and found that LDA seems to be the most qualified method. Moreover, our calculations suggest that the Young moduli for bilayers are insensitive to stacking orders and the mechanical coupling between monolayers seems to be negligible.展开更多
Recently,two-dimensional transition metal dichalcogenides(TMDs)demonstrated their great potential as cost-effective catalysts in hydrogen evolution reaction.Herein,we systematically summarize the existing defect engin...Recently,two-dimensional transition metal dichalcogenides(TMDs)demonstrated their great potential as cost-effective catalysts in hydrogen evolution reaction.Herein,we systematically summarize the existing defect engineering strategies,including intrinsic defects(atomic vacancy and active edges)and extrinsic defects(metal doping,nonmetal doping,and hybrid doping),which have been utilized to obtain advanced TMD-based electrocatalysts.Based on theoretical simulations and experimental results,the electronic structure,intermediate adsorption/desorption energies and possible catalytic mechanisms are thoroughly discussed.Particular emphasis is given to the intrinsic relationship between various types of defects and electrocatalytic properties.Furthermore,current opportunities and challenges for mechanical investigations and applications of defective TMD-based catalysts are presented.The aim herein is to reveal the respective properties of various defective TMD catalysts and provide valuable insights for fabricating high-efficiency TMD-based electrocatalysts.展开更多
Transition metal dichalcogenides （TMDCs） have gained considerable attention because of their novel properties and great potential applications. The flakes of TMDCs not only have great light absorption from visible t...Transition metal dichalcogenides （TMDCs） have gained considerable attention because of their novel properties and great potential applications. The flakes of TMDCs not only have great light absorption from visible to near infrared, but also can be stacked together regardless of lattice mismatch like other two-dimensional （2D） materials. Along with the studies on intrinsic properties of TMDCs, the junctions based on TMDCs become more and more important in applications of photodetection. The junctions have shown many exciting possibilities to fully combine the advantages of TMDCs, other 2D materials, conventional and organic semiconductors together. Early studies have greatly enriched the application of TMDCs in photodetection. In this review, we investigate the efforts in photodetectors based on the junctions of TMDCs and analyze the properties of those photodetectors. Homojunctions based on TMDCs can be made by surface chemical doping, elemental doping and electrostatic gating. Heterojunction formed between TMDCs/2D materials, TMDCs/conventional semiconductors and TMDCs/organic semiconductor also deserve more attentions. We also compare the advantages and disadvantages of different junctions, and then give the prospects for the development of junctions based on TMDCs.展开更多
Field-effect transistors(FETs)present highly sensitive,rapid,and in situ detection capability in chemical and biological analysis.Recently,two-dimensional(2D)transition-metal dichalcogenides(TMDCs)attract significant ...Field-effect transistors(FETs)present highly sensitive,rapid,and in situ detection capability in chemical and biological analysis.Recently,two-dimensional(2D)transition-metal dichalcogenides(TMDCs)attract significant attention as FET channel due to their unique structures and outstanding properties.With the booming of studies on TMDC FETs,we aim to give a timely review on TMDCbased FET sensors for environmental analysis in different media.First,theoretical basics on TMDC and FET sensor are introduced.Then,recent advances of TMDC FET sensor for pollutant detection in gaseous and aqueous media are,respectively,discussed.At last,future perspectives and challenges in practical application and commercialization are given for TMDC FET sensors.This article provides an overview on TMDC sensors for a wide variety of analytes with an emphasize on the increasing demand of advanced sensing technologies in environmental analysis.展开更多
Two-dimensional(2D) transition metal dichalcogenides(TMDs) have emerged as promising alternatives to the platinum-based catalysts for hydrogen evolution reaction(HER). The edge site of these2D materials exhibits HER-a...Two-dimensional(2D) transition metal dichalcogenides(TMDs) have emerged as promising alternatives to the platinum-based catalysts for hydrogen evolution reaction(HER). The edge site of these2D materials exhibits HER-active properties, whereas the large-area basal plane is inactive.Therefore, recent studies and methodologies have been investigated to improve the performance of TMD-based materials by activating inactive sites through elemental doping strategies. In this review,we focus on the metal and non-metal dopant effects on group VI TMDs such as MoS_(2) MoSe_(2) WS_(2)and WSe_(2) for promoting HER performances in acidic electrolytes. A general introduction to the HER is initially provided to explain the parameters in accessing the catalytic performance of dopedTMDs. Then, synthetic methods for doped-TMDs and their HER performances are introduced in order to understand the effect of various dopants including metallic and non-metallic elements. Finally, the current challenges and future opportunities are summarized to provide insights into developing highly active and stable doped-TMD materials and valuable guidelines for engineering TMD-based nanocatalysts for practical water splitting technologies.展开更多
Water splitting has received more and more attention because of its huge potential to generate clean and renewable energy.The highly active and durable oxygen evolution reaction(OER)catalysts play a decisive factor in...Water splitting has received more and more attention because of its huge potential to generate clean and renewable energy.The highly active and durable oxygen evolution reaction(OER)catalysts play a decisive factor in achieving efficient water splitting.The identification of authentic active origin under the service conditions can prompt a more reasonable design of catalysts together with well-confined micro-/nano-structures to boost the efficiency of water splitting.Herein,Fe,Co,and Ni ternary transition metal dichalcogenide(FCND)nanorod arrays on Ni foam are purposely designed as an active and stable low-cost OER pre-catalyst for the electrolysis of water in alkaline media.The optimized FCND catalyst demonstrated a lower overpotential than the binary and unary counterparts,and a 27-fold rise in kinetic current density at the overpotential of 300 m V compared to the nickel dichalcogenide counterpart.Raman spectra and other structural characterizations at different potentials reveal that the in-situ surface self-reconstruction from FCND to ternary transition metal oxyhydroxides(FCNOH)on catalyst surfaces initiated at about 1.5 V,which is identified as the origin of OER activity.The surface selfreconstruction towards FCNOH also enables excellent stability,without fading upon the test for 50 h.展开更多
Recent years have witnessed the wide contributions made by transition metal dichalcogenides(TMDCs)to various fields, including the biomedical field. Here, to identify and further promote the development of biomedical ...Recent years have witnessed the wide contributions made by transition metal dichalcogenides(TMDCs)to various fields, including the biomedical field. Here, to identify and further promote the development of biomedical TMDCs, we provide a bibliometric analysis of literature regarding TMDCs for biomedical applications. Firstly, general bibliometric distributions of the dataset by year, country, institute, Web of Science category and referenced source are recognized. Following, we carefully explore the research hotspots of the TMDC-related biomedical field, among which biosensing, bioelectronics, cancer theranostics, antibacterial and tissue engineering are identified. The functions of TMDCs in each biomedical scenario, the related properties and research challenges are highlighted. Finally, future prospects are proposed to shed light on the design of novel TMDC-related biomaterials, potential new biomedical applications, as well as their clinical translation.展开更多
基金funding provided by the Scientific and Technological Research Council of Türkiye(TÜBİTAK)(Nos.120F234,121F242,122F023 and 123F332).
文摘The studies on the synthesis of two-dimensional(2D)Janus materials have made significant progress over the years.They offer new opportunities to increase the potential usage of Janus transition metal dichalcogenide(TMDC)materials in different application areas due to their unique structural,electrical,optical and mechanical properties.However,the difficulties in synthesizing these materials stand out as a critical factor for further research in this field.This manuscript aims to provide a comprehensive overview of this rapidly developing field by reviewing studies in which Janus TMDC structures have been experimentally obtained.Within the scope of the research,the synthesis methods such as chemical vapor deposition(CVD),pulsed laser deposition(PLD),selective epitaxial atomic replacement(SEAR),plasma-assisted selenization process(PASP)and room temperature atomic layer selenization(RT-ALS)have been handled in detail.The analysis results obtained by various characterization methods such as Raman spectroscopy,photoluminescence(PL),atomic force microscopy(AFM),Kelvin probe force microscopy(KPFM),transmission electron microscopy(TEM),scanning electron microscopy(SEM),X-ray photoelectron spectroscopy(XPS),piezoelectric properties,mechanical properties and second harmonic generation(SHG)have been looked into.Moreover,the kinetic mechanisms of the synthesis processes have been particularly discussed so that the synthesis processes of the materials can be optimized and more controlled synthesis techniques can be developed.As a result of literature review,we can conclude that Janus TMDC structures should have a much wider range of applications despite the difficulties in their synthesis and novel strategies should be developed to synthesize new kind of Janus materials.
基金financially supported by the National Natural Science Foundation of China(No.51902101)Natural Science Foundation of Jiangsu Province(No.BK20201381)。
文摘At present,many parts of the world are seriously short of water resources.Photothermal seawater desalination has been considered to be an efficient and clean way to solve water shortages.Transition metal dichalcogenides(TMDs)has excellent photothermal properties and plays a key role in photothermal seawater desalination.In recent years,a lot of progress has been made regarding TMDs in photothermal seawater desalination,so it is necessary to review the progress of TMDs structure regulation in improving photothermal properties to further enhance the development of this filed.In this review,firstly,various structural regulation methods of TMDs to optimize its properties and improve the performance of photothermal seawater desalination are comprehensively summarized.Secondly,the relationship between unique structure and its photothermal properties of TMDs is further detailedly discussed.Last but not least,we have provided some suggestions in the solar desalination applying TMDs in future.This review would provide a very important reference for the research of structure regulation of TMDs for effective photothermal seawater desalination.
基金supported by the National Key Projects for Fundamental Research and Development of China(2021YFA1500803)the National Natural Science Foundation of China(51825205,52120105002,22088102,22279150,22209186)+1 种基金the Beijing Natural Science Foundation(2222080)the Youth Innovation Promotion Association of the CAS(Y2021011)。
文摘Hydrogen evolution reaction(HER)plays a crucial role in developing clean and renewable hydrogen energy technologies.However,conventional HER catalysts rely on expensive and scarce noble metals,which is a significant challenge for practical application.Recently,twodimensional transition metal dichalcogenides(2D-TMDs)have emerged as attractive and cost-effective alternatives for efficient electrocatalysis in the HER.Substantial efforts have been dedicated to advancing the synthesis and application of 2D-TMDs.This review highlights the design and synthesis of high-performance 2D-TMDs-based HER electrocatalysts by combining theoretical calculations with experimental methods.Subsequently,recent advances in synthesizing different types of 2D TMDs with enhanced HER activity are summarized.Finally,the conclusion and perspectives of the 2D TMDs-based HER electrocatalysts are discussed.We expect that this review will provide new insights into the design and development of highly efficient 2D TMDs-based HER electrocatalysts for industrial applications.
基金financially supported by the National Natural Science Foundation of China(No.52302223)the Fundamental Research Funds for the Central Universities(Nos.2232024G-06-01,24S10102 and 23S10115)
文摘Layered transition metal dichalcogenides(TMDs)have emerged as promising electrode materials for supercapacitors due to their high theoretical specific capacitance,unique layered structure,large surface area,and tunable energy band structure.Substantial progress has been made in the development of TMDs for supercapacitors,with several great breakthroughs reported.However,the practical application of TMDs is still hindered by several challenges,including their susceptibility to oxidation,the tendency to restack or aggregate,structural instability,and interior electrical conductivity.To overcome these limitations,the construction of heterostructures has been identified as an effective strategy.By modulating the interface structure between different components,heterostructures can enhance overall structural stability and facilitate faster ion transport,thereby improving the efficiency of supercapacitors.This review provides a comprehensive overview of recent advances in TMD-based heterostructures for supercapacitors,focusing on their synthesis methods,the relationship between structure,properties,and electrochemical performance,as well as existing challenges.Particular emphasis is placed on hetero structure engineering strategies that integrate TMDs with materials of various dimensionalities(0D,1D,2D,and 3D)to enhance their electrochemical performance for supercapacitors.Finally,the review discusses critical challenges and outlines future perspectives that may guide the development of TMDs for supercapacitors and beyond.
基金supported by the Fund of Education Department of Shaanxi Provincial Government(No.23JP172)the National Natural Science Foundation of China(No.22309189)financial support from Xiaomi Young Talents Program.
文摘Extensive first-principles calculations have been performed to examine the electrochemical properties of Na-ion-intercalatable heterostructures formed by transitional metal dichalcogenides(MS_(2),where M=Ti,V,Nb and Mo)and blue phosphorus(BlueP),which have been reported as potential anode materials for rechargeable sodium-ion batteries.Upon formation of heterostructures,much improved structural stabilities have observed compared with the pristine MS_(2) and BlueP.Metallic T-TiS_(2),T-MoS_(2),H(T)-VS_(2) and H(T)-NbS_(2) would retain the conductive character after formation of heterostructures with BlueP,however,HTiS_(2)/BlueP and H-MoS_(2)/BlueP would undergo a semiconductor to metallic transition accompanied by Na intercalation.Moreover,the presence of relatively low diffusion barriers ranging from 0.04 eV to 0.08 eV,coupled with the suitable average open-circuit voltage spanning from 0.12 eV to 0.89 eV,guarantee exceptional charge-discharge rates and ensure the safety of battery performance.Among these heterostructures,H(T)-NbS_(2)/BlueP and T-TiS_(2)/BlueP exhibit best Na adsorption ability of up to 4 layers,corresponding to theoretical capacities of 570.2 and 746.7 mAh/g,respectively.These encouraging properties indicate that T-TiS_(2)/BlueP and H(T)-NbS_(2)/BlueP could serve as suitable anode materials for high-performance sodiumion batteries.
基金financially supported by the National Natural Science Foundation of China (Nos.11874407, 91436102 and 11374353)the Fundamental Research Funds for the Central Universities (No.06500067)
文摘The thermal conductivity of two-dimensional transition metal dichalcogenides(TMDs)materials is significantly reduced compared to bulk materials due to the quantum size effect,which renders them highly application promising as thermoelectric materials.Here,we employ first-principles methods combined with the non-equilibrium Green's functional formalisms(NEGF-DFT)to reveal the impact of pressure on the thermoelectric performance of monolayer,bilayer and heterostructure TMDs(2H-MoS_(2),2H-WS_(2)and MoS_(2)@WS_(2))materials.The thermoelectric performance of monolayer and heterostructure is significantly enhanced under specific low pressure,and the figure of merit(ZT)of monolayer MoS_(2)and WS_(2)can reaching up to 2.79 and 2.68 at 700 K.Conversely,for bilayer materials,pressure led to a decrease in ZT.The simultaneous discovery of a unique phenomenon in Mobased TMDs materials is that they can undergo transformation from N-type to P-type thermoelectric materials with high electrical conductivity under higher pressure.This is because the pressure causes different effects on the carrier motion at different high symmetry points.Additionally,another bilayer stacking mode is constructed,which successfully surpasses the thermoelectric performance of traditional bilayer MoS_(2)by a specific pressure.This study shows a method to enhance the thermoelectric performance,and more importantly provides a theory that can predict the effect of pressure on the thermoelectric performance of all structures constructed from TMDs materials.
基金Project supported by the National Natural Science Foundation Fund for Distinguished Young Scholars(Grant No.52025022)the National Natural Science Foundation of China(Grant Nos.62574038,12474421,62275045,and 12074060)+1 种基金the National Key R&D Program of China(Grant No.2023YFB3610200)the Fund from Jilin Province(Grant Nos.JJKH20241413KJ and 20240601049RC)。
文摘Two-dimensional(2D)transition metal dichalcogenides(TMDs),endowed with exceptional light-matter interaction strength,have become a pivotal platform in advanced optoelectronics,enabling atomically precise control of excitonic phenomena and offering transformative potential for engineering next-generation optoelectronic devices.In contrast to the narrowband absorption characteristics of conventional band-edge excitons,which are limited by the bandgap energy,highenergy excitons not only demonstrate broad momentum matching capability in the ultraviolet regime due to band nesting effects,but also exhibit distinct absorption peak signatures owing to robust excitonic stabilization under 2D confinement.These unique photophysical properties have established such systems as a prominent research frontier in contemporary exciton physics.This review primarily outlines the distinctive physical characteristics of high-energy excitons in TMDs from the perspectives of band structure,excitonic characteristics,and optical properties.Subsequently,we systematically delineate cutting-edge developments in TMD-based photonic devices exploiting high-energy excitonic band-nesting phenomena,with dedicated emphasis on the strategic engineering of nanoscale heterostructures for tailored optoelectronic functionality.Finally,the discussion concludes with an examination of the challenges associated with the design of high-energy exciton devices and their potential future applications.
基金supported by the National Natural Science Foundation of China(Grant Nos.12304220,12174157,12074150,and 12374174)the Natural Science Foundation of Jiangsu Province(Grant No.BK20230518)+2 种基金the China Postdoctoral Science Foundation(Grant No.2023M731383)the College Student Innovation Project(Grant No.202410299946X)the Scientific Research Project of Jiangsu University(Grant No.22A397).
文摘Designing novel two-dimensional structures and precisely modulating their second harmonic generation(SHG)attributes are key to advancing nonlinear photonic technologies.In this work,through first-principles calculations,we propose a novel tetrahedral phase of transition metal dichalcogenides(TMDs)and validate its structural feasibility in a family of compounds,i.e.,ZX_(2)(Z=Ti,Zr,Hf;X=S,Se,Te).Cohesive energy and phonon dispersion calculations further demonstrate that eight of nine possible ZX_(2)monolayers are dynamically stable.All the ZX_(2)monolayers exhibit pronounced out-of-plane SHG with nonlinear susceptibility components reaching the order of 10^(2)pm/V.Strain engineering imposes a profound influence on the SHG response of ZX_(2)monolayers by reducing symmetry and modifying nonlinear susceptibility components.The redshift and significant enhancement of the prominent peak in SHG spectra are also revealed due to strain-induced charge redistribution and band gap reduction.Intriguingly,strain-driven nonlinear optical switching effects are realized in the ZX_(2)monolayers,with a reversible switching of SHG component ordering under tensile and compressive strain.In such a case,the anisotropic SHG pattern transforms from fourfold to twofold symmetry under the strain.Our work demonstrates the efficacy of strain engineering in precisely enhancing SHG,paving the way for the integration of novel TMD structures into tunable and flexible nonlinear optical devices.
基金support from National Natural Science Foundation of China(Grant Nos.62205223)Natural Science Foundation of Guangdong Province(Grant Nos.2023A1515011455)+6 种基金Science and Technology Innovation Commission of Shenzhen(Grant Nos.20231121120748002)support from Guangdong Introducing Innovative and Entrepreneurial Teams(Grant Nos.2019ZT08L101)Natural Science Foundation of Guangdong Province(Grant Nos.2023A1515110091)Science and Technology Innovation Commission of Shenzhen(Grant Nos.JSGGKQTD20221101115701006)support from National Key R&D Program of China(Grant Nos.2021YFA1401100)National Natural Science Foundation of China(Grant Nos.12104317)Scientific Instrument Developing Project of Shenzhen University(Grant Nos.2023YQ003)。
文摘Two-dimensional transition metal dichalcogenides(2D TMDCs)have received considerable attention in local strain engineering due to their extraordinary mechanical flexibility,electonic structure,and optical properties.The strain-induced out-of-plane deformations in 2D TMDCs lead to diverse excitonic behaviors and versatile modulations in optical properties,paving the way for the development of advanced quantum technologies,flexible optoelectronic materials,and straintronic devices.Research on local strain engineering on 2D TMDCs has been delved into fabrication techniques,electronic state variations,and quantum optical applications.This review begins by summarizing the state-of-the-art methods for introducing local strain into 2D TMDCs,followed by an exploration of the impact of local strain engineering on optical properties.The intriguing phenomena resulting from local strain,such as exciton funnelling and anti-funnelling,are also discussed.We then shift the focus to the application of locally strained 2D TMDCs as quantum emitters,with various strategies outlined for modulating the properties of TMDC-based quantum emitters.Finally,we discuss the remaining questions in this field and provide an outlook on the future of local strain engineering on 2D TMDCs.
基金the funding support from the Start-Up Grant(No.9610495)from City University of Hong KongNational Natural Science Foundation of China(No.22005259)the funding support from JSPS-KAKENHI(Nos.19K15399,21K04839)。
文摘Two-dimensional(2D)transition metal dichalcogenide(TMD)nanosheets have attracted considerable attention owing to their diverse properties and great potential in a wide range of applications.In order to further tune their properties and then broaden their application domain,large efforts have been devoted into engineering the structures of 2D TMD nanosheets at atomic scale,especially the alloying technology.Alloying different 2D TMD nanosheets into 2D alloys not only offers the opportunities to fine-tune their physical/chemical properties,but also opens up some unique properties,which are highly desirable for wide applications including electronics,optoelectronics and catalysis.This review summarizes the recent progress in the preparation,characterization and applications of 2D alloyed TMD nanosheets.
基金the Recruitment Program of Global Youth Experts of China,the National Natural Science Foundation of China(NSFC)under Grant No.11504225the Innovation Program of Shanghai Municipal Education Commission under Grant No.2017-01-07-00-09-E00019.
文摘Molecular dynamics simulations are performed to investigate the misfit straininduced buckling of the transition-metai dichalcogenide(TMD)lateral heterostructures,denoted by the seamless epitaxial growth of different TMDs along the in-plane direction.The Stillinger-Weber potential is utilized to describe both the interaction for each TMD and the coupling between different TMDs,i.e.,MX2(with M=Mo,W and X=S,Se,Te).It is found that the misfit strain can induce strong buckling of the freestanding TMD lateral heterostructures of large area,resulting from the TMDs'atomic-thick nature.The buckling phenomenon occurs in a variety of TMD lateral heterostructures of different compositions and in various patterns.Our findings raise a fundamental mechanical challenge for the structural stability of the freestanding TMD lateral heterostructures.
基金Supported by the National Basic Research Program of China under Grant Nos 2018YFA0305600 and 2017YFA0303302the National Natural Science Foundation of China under Grant Nos 11888101,11774008,11704414 and 11427805+1 种基金the Strategic Priority Research Program of Chinese Academy of Sciences under Grant No XDB28000000Beijing Natural Science Foundation(Z180010)
文摘Transition metal dichalcogenides, featuring layered structures, have aroused enormous interest as a platform for novel physical phenomena and a wide range of potential applications. Among them, special interest has been placed upon WTe_2 and MoTe_2, which exhibit non-trivial topology both in single layer and bulk as well as pressure induced or enhanced superconductivity. We study another distorted IT material NbTe_2 through systematic electrical transport measurements. Intrinsic superconductivity with onset transition temperature(T_c^(onset)) up to 0.72 K is detected where the upper critical field(H_c) shows unconventional quasi-linear behavior,indicating spin-orbit coupling induced p-wave paring. Furthermore, a general model is proposed to fit the angledependent magnetoresistance, which reveals the Fermi surface anisotropy of NbTe_2. Finally, non-saturating linear magnetoresistance up to 50 T is observed and attributed to the quantum limit transport.
基金financially supported by the Doctoral Foundation of Henan University of Technology(No.2021BS030)Natural Science Foundation of Shandong Province(No.ZR2019YQ24)+1 种基金Taishan Scholars and Young Experts Program of Shandong Province(No.tsqn202103057)Qingchuang Talents Induction Program of Shandong Higher Education Institution(Research and Innovation Team of Structural-Functional Polymer Composites)。
文摘Transition metal dichalcogenides(TMDs)show great advantages in electromagnetic wave(EMW)absorption due to their unique structure and electrical properties.Tremendous research works on TMD-based EMW absorbers have been conducted in the last three years,and the comprehensive and systematical summary is still a rarity.Therefore,it is of great significance to elaborate on the interaction among the morphologies,structures,phases,components,and EMW absorption performances of TMD-based absorbers.This review is devoted to analyzing TMD-based absorbers from the following perspectives:the EMW absorption regulation strategies of TMDs and the latest progress of TMD-based hybrids as EMW absorbers.The absorption mechanisms and component-performance dependency of these achievements are also summarized.Finally,a straightforward insight into industrial revolution upgrading in this promising field is proposed.
基金Project supported by the Construct Program of the Key Discipline in Hunan Province,ChinaAid Program for Science and Technology Innovative Research Team in Higher Educational Institutions of Hunan Province,China
文摘First-principle calculations with different exchange-correlation functionals, including LDA, PBE, and vd W-DF functional in the form of opt B88-vd W, have been performed to investigate the electronic and elastic properties of twodimensional transition metal dichalcogenides（TMDCs） with the formula of MX2（M = Mo, W; X = O, S, Se, Te） in both monolayer and bilayer structures. The calculated band structures show a direct band gap for monolayer TMDCs at the K point except for MoO2 and WO2. When the monolayers are stacked into a bilayer, the reduced indirect band gaps are found except for bilayer WTe2, in which the direct gap is still present at the K point. The calculated in-plane Young moduli are comparable to that of graphene, which promises possible application of TMDCs in future flexible and stretchable electronic devices. We also evaluated the performance of different functionals including LDA, PBE, and opt B88-vd W in describing elastic moduli of TMDCs and found that LDA seems to be the most qualified method. Moreover, our calculations suggest that the Young moduli for bilayers are insensitive to stacking orders and the mechanical coupling between monolayers seems to be negligible.
基金National Natural Science Foundation of China,Grant/Award Numbers:51874039,52103333University of Science and Technology Beijing,talent program,Grant/Award Number:06500167Major Science and Technology Project,Grant/Award Number:2017ZX07402001。
文摘Recently,two-dimensional transition metal dichalcogenides(TMDs)demonstrated their great potential as cost-effective catalysts in hydrogen evolution reaction.Herein,we systematically summarize the existing defect engineering strategies,including intrinsic defects(atomic vacancy and active edges)and extrinsic defects(metal doping,nonmetal doping,and hybrid doping),which have been utilized to obtain advanced TMD-based electrocatalysts.Based on theoretical simulations and experimental results,the electronic structure,intermediate adsorption/desorption energies and possible catalytic mechanisms are thoroughly discussed.Particular emphasis is given to the intrinsic relationship between various types of defects and electrocatalytic properties.Furthermore,current opportunities and challenges for mechanical investigations and applications of defective TMD-based catalysts are presented.The aim herein is to reveal the respective properties of various defective TMD catalysts and provide valuable insights for fabricating high-efficiency TMD-based electrocatalysts.
基金Project supported by the National Basic Research Program of China(Grant No.2014CB643903)the National Natural Science Foundation of China(Grant Nos.61225021,11474272,11174272,and 11404324)K.C.Wong Education Foundation
文摘Transition metal dichalcogenides （TMDCs） have gained considerable attention because of their novel properties and great potential applications. The flakes of TMDCs not only have great light absorption from visible to near infrared, but also can be stacked together regardless of lattice mismatch like other two-dimensional （2D） materials. Along with the studies on intrinsic properties of TMDCs, the junctions based on TMDCs become more and more important in applications of photodetection. The junctions have shown many exciting possibilities to fully combine the advantages of TMDCs, other 2D materials, conventional and organic semiconductors together. Early studies have greatly enriched the application of TMDCs in photodetection. In this review, we investigate the efforts in photodetectors based on the junctions of TMDCs and analyze the properties of those photodetectors. Homojunctions based on TMDCs can be made by surface chemical doping, elemental doping and electrostatic gating. Heterojunction formed between TMDCs/2D materials, TMDCs/conventional semiconductors and TMDCs/organic semiconductor also deserve more attentions. We also compare the advantages and disadvantages of different junctions, and then give the prospects for the development of junctions based on TMDCs.
基金the National Natural Science Foundation of China(No.21707102)the Fundamental Research Funds for the Central Universities,China(No.22120180524).
文摘Field-effect transistors(FETs)present highly sensitive,rapid,and in situ detection capability in chemical and biological analysis.Recently,two-dimensional(2D)transition-metal dichalcogenides(TMDCs)attract significant attention as FET channel due to their unique structures and outstanding properties.With the booming of studies on TMDC FETs,we aim to give a timely review on TMDCbased FET sensors for environmental analysis in different media.First,theoretical basics on TMDC and FET sensor are introduced.Then,recent advances of TMDC FET sensor for pollutant detection in gaseous and aqueous media are,respectively,discussed.At last,future perspectives and challenges in practical application and commercialization are given for TMDC FET sensors.This article provides an overview on TMDC sensors for a wide variety of analytes with an emphasize on the increasing demand of advanced sensing technologies in environmental analysis.
基金supported by the National Research Foundation of Korea(NRF-2021R1A2C4001411,2020R1A4A1018393,2020R1C1C 1008514,2020R1I1A1A01072100,2019R1A6A1A11053838)。
文摘Two-dimensional(2D) transition metal dichalcogenides(TMDs) have emerged as promising alternatives to the platinum-based catalysts for hydrogen evolution reaction(HER). The edge site of these2D materials exhibits HER-active properties, whereas the large-area basal plane is inactive.Therefore, recent studies and methodologies have been investigated to improve the performance of TMD-based materials by activating inactive sites through elemental doping strategies. In this review,we focus on the metal and non-metal dopant effects on group VI TMDs such as MoS_(2) MoSe_(2) WS_(2)and WSe_(2) for promoting HER performances in acidic electrolytes. A general introduction to the HER is initially provided to explain the parameters in accessing the catalytic performance of dopedTMDs. Then, synthetic methods for doped-TMDs and their HER performances are introduced in order to understand the effect of various dopants including metallic and non-metallic elements. Finally, the current challenges and future opportunities are summarized to provide insights into developing highly active and stable doped-TMD materials and valuable guidelines for engineering TMD-based nanocatalysts for practical water splitting technologies.
基金the financial support from the National Natural Science Foundation of China(21673171)the kind support for the academic research by the Ministry of Education Singapore(Tier 1,R284-000-193-114)for research conducted in the National University of Singapore.Q.C.thanks support from the China Scholarship Council(CSC)。
文摘Water splitting has received more and more attention because of its huge potential to generate clean and renewable energy.The highly active and durable oxygen evolution reaction(OER)catalysts play a decisive factor in achieving efficient water splitting.The identification of authentic active origin under the service conditions can prompt a more reasonable design of catalysts together with well-confined micro-/nano-structures to boost the efficiency of water splitting.Herein,Fe,Co,and Ni ternary transition metal dichalcogenide(FCND)nanorod arrays on Ni foam are purposely designed as an active and stable low-cost OER pre-catalyst for the electrolysis of water in alkaline media.The optimized FCND catalyst demonstrated a lower overpotential than the binary and unary counterparts,and a 27-fold rise in kinetic current density at the overpotential of 300 m V compared to the nickel dichalcogenide counterpart.Raman spectra and other structural characterizations at different potentials reveal that the in-situ surface self-reconstruction from FCND to ternary transition metal oxyhydroxides(FCNOH)on catalyst surfaces initiated at about 1.5 V,which is identified as the origin of OER activity.The surface selfreconstruction towards FCNOH also enables excellent stability,without fading upon the test for 50 h.
基金supported by the Strategic Priority Research Program of Chinese Academy of Sciences (No. XDB36000000)the National Basic Research Program of China (Nos. 2020YFA0710702 and 2016YFA2021600)+2 种基金the National Natural Science Foundation of China (Nos. 51822207, 51772292 and 11621505)Chinese Academy of Sciences Youth Innovation Promotion Association (No. 2013007)CAS-Iranian Vice Presidency for Science and Technology Joint Research Project (No. 113111KYSB20190067)。
文摘Recent years have witnessed the wide contributions made by transition metal dichalcogenides(TMDCs)to various fields, including the biomedical field. Here, to identify and further promote the development of biomedical TMDCs, we provide a bibliometric analysis of literature regarding TMDCs for biomedical applications. Firstly, general bibliometric distributions of the dataset by year, country, institute, Web of Science category and referenced source are recognized. Following, we carefully explore the research hotspots of the TMDC-related biomedical field, among which biosensing, bioelectronics, cancer theranostics, antibacterial and tissue engineering are identified. The functions of TMDCs in each biomedical scenario, the related properties and research challenges are highlighted. Finally, future prospects are proposed to shed light on the design of novel TMDC-related biomaterials, potential new biomedical applications, as well as their clinical translation.
