The introduction of two-dimensional(2D)perovskite layers on top of three-dimensional(3D)perovskite films enhances the performance and stability of perovskite solar cells(PSCs).However,the electronic effect of the spac...The introduction of two-dimensional(2D)perovskite layers on top of three-dimensional(3D)perovskite films enhances the performance and stability of perovskite solar cells(PSCs).However,the electronic effect of the spacer cation and the quality of the 2D capping layer are critical factors in achieving the required results.In this study,we compared two fluorinated salts:4-(trifluoromethyl)benzamidine hydrochloride(4TF-BA·HCl)and 4-fluorobenzamidine hydrochloride(4F-BA·HCl)to engineer the 3D/2D perovskite films.Surprisingly,4F-BA formed a high-performance 3D/2D heterojunction,while4TF-BA produced an amorphous layer on the perovskite films.Our findings indicate that the balanced intramolecular charge polarization,which leads to effective hydrogen bonding,is more favorable in 4F-BA than in 4TF-BA,promoting the formation of a crystalline 2D perovskite.Nevertheless,4TF-BA managed to improve efficiency to 24%,surpassing the control device,primarily due to the natural passivation capabilities of benzamidine.Interestingly,the devices based on 4F-BA demonstrated an efficiency exceeding 25%with greater longevity under various storage conditions compared to 4TF-BA-based and the control devices.展开更多
The growing global energy demand and worsening climate change highlight the urgent need for clean,efficient and sustainable energy solutions.Among emerging technologies,atomically thin two-dimensional(2D)materials off...The growing global energy demand and worsening climate change highlight the urgent need for clean,efficient and sustainable energy solutions.Among emerging technologies,atomically thin two-dimensional(2D)materials offer unique advantages in photovoltaics due to their tunable optoelectronic properties,high surface area and efficient charge transport capabilities.This review explores recent progress in photovoltaics incorporating 2D materials,focusing on their application as hole and electron transport layers to optimize bandgap alignment,enhance carrier mobility and improve chemical stability.A comprehensive analysis is presented on perovskite solar cells utilizing 2D materials,with a particular focus on strategies to enhance crystallization,passivate defects and improve overall cell efficiency.Additionally,the application of 2D materials in organic solar cells is examined,particularly for reducing recombination losses and enhancing charge extraction through work function modification.Their impact on dye-sensitized solar cells,including catalytic activity and counter electrode performance,is also explored.Finally,the review outlines key challenges,material limitations and performance metrics,offering insight into the future development of nextgeneration photovoltaic devices encouraged by 2D materials.展开更多
Two-dimensional(2D)materials show great potential as novel membrane materials due to their atomic thickness and periodic pore structure.Currently,free-standing membranes based on 2D materials open up new avenues for u...Two-dimensional(2D)materials show great potential as novel membrane materials due to their atomic thickness and periodic pore structure.Currently,free-standing membranes based on 2D materials open up new avenues for ultra-fast and highly selective separation.With the absence of porous substrates,free-standing membranes offer shortened transport paths for efficient mass transfer.The interfacial defects between the substrate and selective layer are eliminated to alleviate the internal membrane fouling,enabling the intact structure for precise separation.Hence,this review aims to outline the superiority of 2D material-based free-standing membranes for selective separation applications.Free-standing 2D material membranes composed of the most representative graphenebased materials,MXene,covalent organic framework(COF),metal organic framework(MOF),and hydrogen-bonded organic framework(HOF)are summarized with the discussion on the influence of substrate on their structural properties.The separation performance enhancement strategies in regard to the 2D material,membrane structure,and mechanical properties are examined.Finally,we propose several critical challenges and perspectives in terms of pore size control,mechanical strength improvement,understanding the underlying mass transfer mechanism,issues related to membrane fabrication optimization,scale production,and separation application versatility.This review will provide researchers with practical guidelines for advancing free-standing 2D material membranes for future selective separation applications.展开更多
Twisted multilayers of two-dimensional materials attract widespread research interest due to their intriguing electronic and optical properties related to their chiral symmetry breaking and moiréeffects.The two-d...Twisted multilayers of two-dimensional materials attract widespread research interest due to their intriguing electronic and optical properties related to their chiral symmetry breaking and moiréeffects.The two-dimensional transition metal dichalcogenide MoSe_(2) is a particularly promising material for twisted multilayers,capable of sustaining moiréexcitons.Here,we report on a rational bottomup synthesis approach for twisted MoSe_(2) flakes by chemical vapor transport(CVT).Screw dislocation-driven growth was forced by surface-fused SiO_(2)nanoparticles on the substrates that serve as potential nucleation points in low supersaturation condition.Thus,crystal growth by in-situ CVT under addition of MoCl_(5) leads to bulk 2H-MoSe_(2) in a temperature gradient from 900 to 820℃ with a dwell time of 96 h.Hexagonally shaped 2H-MoSe_(2) flakes were grown from 710 to 685℃ with a dwell time of 30 min on SiO_(2)@Al_(2)O_(3)(0001)substrates.Electron backscatter diffraction as well as electron microscopy reveals the screw dislocation-driven growth of triangular 3R-MoSe_(2) with individual step heights between 0.9 and 2.9 nm on SiO_(2)@Si(100)under the same conditions.Finally,twisted MoSe_(2) flakes exhibiting a twist angle of 19°with respect to the[010]zone axis could be synthesized.展开更多
Non-layered two-dimensional materials(NL2DMs)have emerged as a promising complement to layered 2D materials,offering unique properties derived from their isotropic bonding and structural diversity.However,their synthe...Non-layered two-dimensional materials(NL2DMs)have emerged as a promising complement to layered 2D materials,offering unique properties derived from their isotropic bonding and structural diversity.However,their synthesis is still facing significant challenges due to the lack of intrinsic anisotropic growth driving force.This review comprehensively outlines strategies for chemical vapor deposition(CVD)-based synthesis of NL2DMs,demonstrating how integrated thermodynamic and kinetic control enables precise thickness and morphology modulation.We also analyze the existing challenges and propose future research directions.This systematic framework paves the way for engineering NL2DMs growth with customized functionalities for next-generation optoelectronics,energy storage,and catalysis.展开更多
The field of artificial intelligence and neural computing has been rapidly expanding due to the imple-mentation of resistive random-access memory(RRAM)based artificial synaptic.However,the low flexibility of conventio...The field of artificial intelligence and neural computing has been rapidly expanding due to the imple-mentation of resistive random-access memory(RRAM)based artificial synaptic.However,the low flexibility of conventional RRAM materials hinders their ability to mimic synaptic behavior accurately.To overcome such limitation,organic-2D composites with high mechanical properties are proposed as the active layer of RRAM.Moreover,we enhance the reliability of the device by ZrO_(2)insertion layer,resulting in stable synaptic performance.The Ag/PVA:h-BN/ZrO_(2)/ITO devices show stable bipolar resistive switching behavior with an ON/OFF ratio of over 5×10^(2),a~2400 cycles endurance and a long retention time(>6×10^(3)s),which are essential for the development of high-performance RRAMs.We also study the possible synaptic mechanism and dynamic plasticity of the memory device,observing the transition from short-term potentiation(STP)to long-term potentiation(LTP)under the effect of continuous voltage pulses.Moreover,the device exhibits both long-term depression(LTD)and paired-pulse facili-tation(PPF)properties,which have significant implications for the design of organic-2D composite material RRAMs that aim to mimic biological synapses,representing promising avenues for the devel-opment of advanced neuromorphic computing systems.展开更多
为研发同时预防和控制猪圆环病毒2d基因型(PCV2d)和猪伪狂犬病病毒(PRV)的疫苗,将PCV2dORF2基因克隆到含有绿色荧光蛋白(EGFP)基因的PRV转移质粒pG中BamHⅠ位点,获得重组质粒pG-PCV2d-EGFP。运用转染试剂ZLip2000将其与PRV变异株3基因...为研发同时预防和控制猪圆环病毒2d基因型(PCV2d)和猪伪狂犬病病毒(PRV)的疫苗,将PCV2dORF2基因克隆到含有绿色荧光蛋白(EGFP)基因的PRV转移质粒pG中BamHⅠ位点,获得重组质粒pG-PCV2d-EGFP。运用转染试剂ZLip2000将其与PRV变异株3基因缺失毒株gE^(-)/g^(-)/TK^(-)PRV NY DNA转入ST细胞中,经绿色荧光蚀斑纯化,得到表达EGFP的重组病毒rPRV-PCV2d-EGFP。采用CRISPR/Cas9基因双敲除质粒敲除重组病毒中EGFP基因,经蚀斑纯化,拯救出不表达EGFP的重组病毒rPRV-PCV2d。重组病毒rPRV-PCV2d与亲本株gE^(-)/g^(-)/TK^(-)PRV NY具有相近的遗传稳定性,且能够表达PCV2d衣壳(Cap)蛋白。在6周龄小鼠免疫试验中,与商品化PCV2灭活疫苗相比,rPRV-PCV2d刺激小鼠机体诱导了更高的PCV2特异性抗体,且用PCV2d强毒株攻毒后,rPRV-PCV2d显著降低了小鼠心脏、肝脏、脾脏等组织中PCV2d载量。此外,rPRV-PCV2d在小鼠体内激发PRV特异性免疫应答,并能阻止PRV强毒对小鼠的侵袭。表明rPRV-PCV2d具有良好的免疫原性。展开更多
基金supported by the National Key Research and Development Programs-Intergovernmental International Cooperation in Science and Technology Innovation Project(Grant No.2022YFE0118400)the Natural Science Foundation of Hunan Province(2023JJ50132)+1 种基金Shenzhen Science and Technology Innovation Committee(Grants Nos.JCYJ20220818100211025,and KCXST20221021111616039)Shenzhen Science and Technology Program(No.20231128110928003)。
文摘The introduction of two-dimensional(2D)perovskite layers on top of three-dimensional(3D)perovskite films enhances the performance and stability of perovskite solar cells(PSCs).However,the electronic effect of the spacer cation and the quality of the 2D capping layer are critical factors in achieving the required results.In this study,we compared two fluorinated salts:4-(trifluoromethyl)benzamidine hydrochloride(4TF-BA·HCl)and 4-fluorobenzamidine hydrochloride(4F-BA·HCl)to engineer the 3D/2D perovskite films.Surprisingly,4F-BA formed a high-performance 3D/2D heterojunction,while4TF-BA produced an amorphous layer on the perovskite films.Our findings indicate that the balanced intramolecular charge polarization,which leads to effective hydrogen bonding,is more favorable in 4F-BA than in 4TF-BA,promoting the formation of a crystalline 2D perovskite.Nevertheless,4TF-BA managed to improve efficiency to 24%,surpassing the control device,primarily due to the natural passivation capabilities of benzamidine.Interestingly,the devices based on 4F-BA demonstrated an efficiency exceeding 25%with greater longevity under various storage conditions compared to 4TF-BA-based and the control devices.
基金supported by the IITP(Institute of Information & Communications Technology Planning & Evaluation)-ITRC(Information Technology Research Center) grant funded by the Korea government(Ministry of Science and ICT) (IITP-2025-RS-2024-00437191, and RS-2025-02303505)partly supported by the Korea Basic Science Institute (National Research Facilities and Equipment Center) grant funded by the Ministry of Education. (No. 2022R1A6C101A774)the Deanship of Research and Graduate Studies at King Khalid University, Saudi Arabia, through Large Research Project under grant number RGP-2/527/46
文摘The growing global energy demand and worsening climate change highlight the urgent need for clean,efficient and sustainable energy solutions.Among emerging technologies,atomically thin two-dimensional(2D)materials offer unique advantages in photovoltaics due to their tunable optoelectronic properties,high surface area and efficient charge transport capabilities.This review explores recent progress in photovoltaics incorporating 2D materials,focusing on their application as hole and electron transport layers to optimize bandgap alignment,enhance carrier mobility and improve chemical stability.A comprehensive analysis is presented on perovskite solar cells utilizing 2D materials,with a particular focus on strategies to enhance crystallization,passivate defects and improve overall cell efficiency.Additionally,the application of 2D materials in organic solar cells is examined,particularly for reducing recombination losses and enhancing charge extraction through work function modification.Their impact on dye-sensitized solar cells,including catalytic activity and counter electrode performance,is also explored.Finally,the review outlines key challenges,material limitations and performance metrics,offering insight into the future development of nextgeneration photovoltaic devices encouraged by 2D materials.
基金granted by Shandong Provincial Natural Science Foundation,China(No.ZR2023QB170)Guangxi First class Disciplines(Agricultural Resources and Environment),Open Project of State Key Laboratory of Urban Water Resource and Environment,Harbin Institute of Technology(No.ES202428)+3 种基金Shandong Excellent Young Scientists Fund Program(Overseas)(No.2024HWYQ-051)the National Natural Science Fund of China(No.22506033)Young Elite Scientists Sponsorship Program by CASTYoung Taishan Scholars Program of Shandong Province.
文摘Two-dimensional(2D)materials show great potential as novel membrane materials due to their atomic thickness and periodic pore structure.Currently,free-standing membranes based on 2D materials open up new avenues for ultra-fast and highly selective separation.With the absence of porous substrates,free-standing membranes offer shortened transport paths for efficient mass transfer.The interfacial defects between the substrate and selective layer are eliminated to alleviate the internal membrane fouling,enabling the intact structure for precise separation.Hence,this review aims to outline the superiority of 2D material-based free-standing membranes for selective separation applications.Free-standing 2D material membranes composed of the most representative graphenebased materials,MXene,covalent organic framework(COF),metal organic framework(MOF),and hydrogen-bonded organic framework(HOF)are summarized with the discussion on the influence of substrate on their structural properties.The separation performance enhancement strategies in regard to the 2D material,membrane structure,and mechanical properties are examined.Finally,we propose several critical challenges and perspectives in terms of pore size control,mechanical strength improvement,understanding the underlying mass transfer mechanism,issues related to membrane fabrication optimization,scale production,and separation application versatility.This review will provide researchers with practical guidelines for advancing free-standing 2D material membranes for future selective separation applications.
基金funding from SFB 1415 subproject B04(Deutsche Forschungsgemeinschaft,No.417590517)supported by the Deutsche Forschungsgemeinschaft through the Würzburg-Dresden Cluster of Excellence on Complexity and Topology in Quantum Matter-ct.qmat(EXC 2147,No.390858490)the support provided by the DRESDEN-concept alliance of research institutions.
文摘Twisted multilayers of two-dimensional materials attract widespread research interest due to their intriguing electronic and optical properties related to their chiral symmetry breaking and moiréeffects.The two-dimensional transition metal dichalcogenide MoSe_(2) is a particularly promising material for twisted multilayers,capable of sustaining moiréexcitons.Here,we report on a rational bottomup synthesis approach for twisted MoSe_(2) flakes by chemical vapor transport(CVT).Screw dislocation-driven growth was forced by surface-fused SiO_(2)nanoparticles on the substrates that serve as potential nucleation points in low supersaturation condition.Thus,crystal growth by in-situ CVT under addition of MoCl_(5) leads to bulk 2H-MoSe_(2) in a temperature gradient from 900 to 820℃ with a dwell time of 96 h.Hexagonally shaped 2H-MoSe_(2) flakes were grown from 710 to 685℃ with a dwell time of 30 min on SiO_(2)@Al_(2)O_(3)(0001)substrates.Electron backscatter diffraction as well as electron microscopy reveals the screw dislocation-driven growth of triangular 3R-MoSe_(2) with individual step heights between 0.9 and 2.9 nm on SiO_(2)@Si(100)under the same conditions.Finally,twisted MoSe_(2) flakes exhibiting a twist angle of 19°with respect to the[010]zone axis could be synthesized.
基金supported by the National Natural Science Foundation of China(Nos.12474163,52202161 and 12034002)State Key Laboratory for Advanced Metals and Materials(No.2025-S02).
文摘Non-layered two-dimensional materials(NL2DMs)have emerged as a promising complement to layered 2D materials,offering unique properties derived from their isotropic bonding and structural diversity.However,their synthesis is still facing significant challenges due to the lack of intrinsic anisotropic growth driving force.This review comprehensively outlines strategies for chemical vapor deposition(CVD)-based synthesis of NL2DMs,demonstrating how integrated thermodynamic and kinetic control enables precise thickness and morphology modulation.We also analyze the existing challenges and propose future research directions.This systematic framework paves the way for engineering NL2DMs growth with customized functionalities for next-generation optoelectronics,energy storage,and catalysis.
基金supported by Guangxi Natural Science Foundation(No.2022GXNSFBA035487)Guangxi Science and Technology Project(No.AD21220056,AD19110038)+2 种基金National Natural Science Foundation of China(No.62174041,52061009,52262022)Yunnan Province Major Science and Technology Projects(202102AB080008-2)Guangxi Key Laboratory of Precision Navigation Technology and Application,Guilin University of Electronic Technology(No.DH202203,DH202202,DH202221,DH202222,DH202214).
文摘The field of artificial intelligence and neural computing has been rapidly expanding due to the imple-mentation of resistive random-access memory(RRAM)based artificial synaptic.However,the low flexibility of conventional RRAM materials hinders their ability to mimic synaptic behavior accurately.To overcome such limitation,organic-2D composites with high mechanical properties are proposed as the active layer of RRAM.Moreover,we enhance the reliability of the device by ZrO_(2)insertion layer,resulting in stable synaptic performance.The Ag/PVA:h-BN/ZrO_(2)/ITO devices show stable bipolar resistive switching behavior with an ON/OFF ratio of over 5×10^(2),a~2400 cycles endurance and a long retention time(>6×10^(3)s),which are essential for the development of high-performance RRAMs.We also study the possible synaptic mechanism and dynamic plasticity of the memory device,observing the transition from short-term potentiation(STP)to long-term potentiation(LTP)under the effect of continuous voltage pulses.Moreover,the device exhibits both long-term depression(LTD)and paired-pulse facili-tation(PPF)properties,which have significant implications for the design of organic-2D composite material RRAMs that aim to mimic biological synapses,representing promising avenues for the devel-opment of advanced neuromorphic computing systems.
文摘为研发同时预防和控制猪圆环病毒2d基因型(PCV2d)和猪伪狂犬病病毒(PRV)的疫苗,将PCV2dORF2基因克隆到含有绿色荧光蛋白(EGFP)基因的PRV转移质粒pG中BamHⅠ位点,获得重组质粒pG-PCV2d-EGFP。运用转染试剂ZLip2000将其与PRV变异株3基因缺失毒株gE^(-)/g^(-)/TK^(-)PRV NY DNA转入ST细胞中,经绿色荧光蚀斑纯化,得到表达EGFP的重组病毒rPRV-PCV2d-EGFP。采用CRISPR/Cas9基因双敲除质粒敲除重组病毒中EGFP基因,经蚀斑纯化,拯救出不表达EGFP的重组病毒rPRV-PCV2d。重组病毒rPRV-PCV2d与亲本株gE^(-)/g^(-)/TK^(-)PRV NY具有相近的遗传稳定性,且能够表达PCV2d衣壳(Cap)蛋白。在6周龄小鼠免疫试验中,与商品化PCV2灭活疫苗相比,rPRV-PCV2d刺激小鼠机体诱导了更高的PCV2特异性抗体,且用PCV2d强毒株攻毒后,rPRV-PCV2d显著降低了小鼠心脏、肝脏、脾脏等组织中PCV2d载量。此外,rPRV-PCV2d在小鼠体内激发PRV特异性免疫应答,并能阻止PRV强毒对小鼠的侵袭。表明rPRV-PCV2d具有良好的免疫原性。
