期刊文献+
共找到2,163篇文章
< 1 2 109 >
每页显示 20 50 100
Self-trapped Excitons in Metal Halides for Lighting Applications
1
作者 ZHANG Xiang LIU Nian +1 位作者 LUO Jiajun TANG Jiang 《发光学报》 北大核心 2026年第3期423-435,共13页
Metal halides have attracted worldwide attention as exceptional optoelectronic materials.Over the past decade,research on metal halides has yielded remarkable progress,and their color-conversion applications have show... Metal halides have attracted worldwide attention as exceptional optoelectronic materials.Over the past decade,research on metal halides has yielded remarkable progress,and their color-conversion applications have shown considerable promise for commercialization.With the reporting of self-trapped exciton(STE)emission in perovskites,the application of metal halides as broadband emitting materials in the lighting field has gained increas-ing interest.Herein,we provide a comprehensive review of metal halide STE emitters,especially for lighting applications.We begin with highlighting the ideal spectral characteristics and corresponding performance metrics for lighting.This is followed by a systematic summary of the mechanisms,optimization strategies,and recent advances of STE emission in metal halides.Finally,we outline the major challenges and prospective trends for metal halide STE emitters.This review aims to offer valuable insights into metal halide STE emitters and their lighting applications for facilitating the future commercialization. 展开更多
关键词 self-trapped exciton metal halide LIGHTING optoelectronic applications
在线阅读 下载PDF
Research Progress on High Thermal Conductivity Graphene/Copper-Based Composite Heat Sinks for Electronic Equipment
2
作者 Li Hongzhao Jiang Haojie +3 位作者 Pan Jiabao Jia Hongsheng Chen Minghe Chen Yang 《稀有金属材料与工程》 北大核心 2026年第3期636-654,共19页
Graphene/copper-based composite heat sinks demonstrate extensive application potential in military equipment thermal management,high-power electronic packaging,new energy vehicles,and 5G communication systems,due to t... Graphene/copper-based composite heat sinks demonstrate extensive application potential in military equipment thermal management,high-power electronic packaging,new energy vehicles,and 5G communication systems,due to their outstanding properties,including high thermal conductivity,tunable thermal expansion coefficients,excellent mechanical strength,and low density.However,the industrial-scale application of these composites faces critical challenges during the fabrication of components with complex structures,such as inhomogeneous dispersion of graphene within the copper matrix and poor interfacial bonding between the two phases,which substantially undermine the overall performance of graphene/copper-based composites.To address these issues,the preparation methods for graphene/copper-based composite heat sinks were reviewed.For each method,a rigorous analysis was presented to clarify its inherent advantages and unavoidable restrictions.Furthermore,the latest research progress in addressing three core scientific challenges was synthesized,including uniform dispersion of graphene,interfacial optimization mechanisms,and molecular dynamics simulations for elucidating the structure-property relationships.Finally,the future development directions of graphene/copper-based composite heat sinks in engineering applications were prospected. 展开更多
关键词 graphene/copper-based composite heat sinks preparation methods interfacial bonding MECHANISM molecular dynamics
原文传递
Advances in electrocatalytic and photocatalytic CO_(2)conversion to value-added chemicals using copper-based covalent organic frameworks
3
作者 LI Yue LIU Ziqi +7 位作者 FENG Ke LI Yingdan NING Yue SHEN Li LU Jitao MENG Qingguo WANG Min WANG Haiying 《无机化学学报》 北大核心 2026年第1期1-22,共22页
CO_(2)reduction technology can promote the resource utilization of carbon and help alleviate global warming and energy supply pressure.It is an effective way to achieve energy conversion and utilization.Covalent organ... CO_(2)reduction technology can promote the resource utilization of carbon and help alleviate global warming and energy supply pressure.It is an effective way to achieve energy conversion and utilization.Covalent organic frameworks(COFs)are porous crystalline materials formed by connecting organic monomers through covalent bonds.They have the characteristics of functional diversity and rich chemical properties.Their advantages,such as high porosity,a wide range of visible light absorption,and excellent charge separation efficiency,give them good potential in CO_(2)capture,separation,and conversion.Currently,Cu is a key metal in the catalytic CO_(2)reduction reaction(CO_(2)RR)for the preparation of high-value-added chemicals.The preparation of highly stable and large-pore Cu-based COFs using COFs as an ideal sacrificial template for loading Cu can be used to develop high-performance electrocatalysts and photocatalysts.In this review,we discuss the latest advancements in this field,including the development of various Cu-based COFs and their applications as catalysts for CO_(2)RR.Here,we mainly introduce the synthesis strategies,some important characterization information,and the applications of electrocatalytic and photocatalytic CO_(2)conversion using these previously reported Cu-based COFs. 展开更多
关键词 copper-based covalent organic frameworks CO_(2)reduction reactions electrocatalytic CO_(2)conversion photocatalytic CO_(2)conversion
在线阅读 下载PDF
Copper-Based Targeted Nanocatalytic Therapeutics for Non-Small Cell Lung Cancer
4
作者 Yongfei Fan Jiao Chang +9 位作者 Xichun Qin Meng Li Yan Li Leilei Wu Kun Li Zhimin Chen Yani Li Zhongmin Tang Dong Xie Jianlin Shi 《Nano-Micro Letters》 2026年第5期299-319,共21页
Conventional treatments for non-small cell lung cancer(NSCLC)suffer from low remission rates,high drug resistance,and severe adverse effects.To leverage the therapeutic potential of reactive oxygen species(ROS),nanoca... Conventional treatments for non-small cell lung cancer(NSCLC)suffer from low remission rates,high drug resistance,and severe adverse effects.To leverage the therapeutic potential of reactive oxygen species(ROS),nanocatalytic medicine utilizes nanomaterials to generate ROS specifically within tumor sites,enabling efficient and targeted cancer treatment.In this study,hyaluronic acid(HA)-modified copper-N,N-dimethyl-Nphenylsulfonylbisamine(DMSA)-assembled nanoparticles(Cu-DMSA-HA NPs)are developed with tumor-targeting capability and efficiently catalyze ROS production via coordination chemistry.Targeted delivery is facilitated by HA surface modification through recognition of overexpressed cluster of differentiation 44 receptors on cancer cells,which enhances nanoparticle uptake.Once internalized,intracellular glutathione is depleted by the NPs,followed by a Fenton-like reaction that sustains ROS production.Both in vitro and in vivo studies demonstrate that this catalytic strategy effectively inhibits DNA replication,prevents cell cycle progression,downregulates glutathione peroxidase 4 expression,induces ferroptosis,and ultimately suppresses NSCLC progression.Overall,the readily prepared Cu-DMSA-HA NPs exhibit robust catalytic activity and tumor specificity,highlighting their strong potential for clinical translation in nanocatalytic cancer therapy. 展开更多
关键词 Nanocatalytic medicine Reactive oxygen species Lung cancer therapy copper-based nanoparticles
在线阅读 下载PDF
Tunable broadband luminescence in lead-free hybrid copper halides
5
作者 Yanyan Li Ali Azmy +8 位作者 Shunran Li Huiju Lee Benjamin T.Diroll Mircea Cotlet Lukasz Wojtas Yi Xia Ido Hadar Ioannis Spanopoulos Peijun Guo 《Journal of Energy Chemistry》 2026年第3期362-369,共8页
Metal halides are an important class of optoelectronic materials combining exceptional optical and electronic properties.An inherent advantage of metal halides is their solution synthesis and processability,which rend... Metal halides are an important class of optoelectronic materials combining exceptional optical and electronic properties.An inherent advantage of metal halides is their solution synthesis and processability,which render them as low-cost and environmentally friendly materials for a range of applications from photovoltaics and photodetection to solid-state lighting(SSL).In this study,we synthesized three previously unreported lead-free organic–inorganic hybrid copper halides:(OA)_(4)CuX_(5)(X=Br,I;OA^(+) =C_(8)H_(17)NH_(3)^(+) ,n-octylammonium cation)and(HA)_(2)CuI_(3)(HA^(+) =C_(6)H_(13)NH_(3)^(+) ,n-hexylammonium cation),all of which exhibit broadband emissions arising from self-trapped excitons(STEs).Among these compounds,(OA)_(4)CuI_(5) demonstrates tunable dual-band white-light emission with a high color rendering index value of 91 at room temperature.Temperature-dependent photoluminescence measurements and first-principles calculations reveal distinct behaviors between the two emission states in(OA)_(4)CuI_(5).These findings highlight the potential of copper halide compounds for optoelectronic applications,particularly in the development of environmentally friendly solid-state lighting technologies. 展开更多
关键词 LEAD-FREE Solid-state lighting Copper halides Self-trapped excitons
在线阅读 下载PDF
Ni-Catalyzed Reductive Alkylation of Polyfluoroarenes with Alkyl Halides 被引量:1
6
作者 Xie Shentong Li Wenjing +2 位作者 Liu Yu Lu Xi Shi Renyi 《有机化学》 北大核心 2025年第6期2121-2127,共7页
Polyfluoroarenes represent an essential group of compounds in the fields of medical and material chemistry.It is still a challenge to synthesize alkylated polyfluoroarenes.Herein,a Ni-catalyzed reductive alkylation of... Polyfluoroarenes represent an essential group of compounds in the fields of medical and material chemistry.It is still a challenge to synthesize alkylated polyfluoroarenes.Herein,a Ni-catalyzed reductive alkylation of polyfluoroarenes with alkyl halides under mild conditions is reported.Polyfluoroarenes(3~6 F)can reacted smoothly with a diverse range of alkyl halides,such as primary,secondary,and tertiary alkyl iodides.The efficient formation of C(sp2)—C(sp3)can be achieved through the combination of Ni catalysis and(Bpin)2/K2CO3 as terminal reductant. 展开更多
关键词 nickel catalysis polyfluoroarenes alkyl halides reductive cross-coupling
原文传递
Comprehensive first-principles studies on phase stability of copper-based halide perovskite derivatives A_lCu_mX_n(A = Rb and Cs;X = Cl, Br, and I) 被引量:2
7
作者 Zhongti Sun Xiwen Chen Wanjian Yin 《Journal of Semiconductors》 EI CAS CSCD 2020年第5期60-70,共11页
Recently,inorganic copper-based halide perovskites and their derivatives(CHPs)with chemical formulas AlCumXn(A=Rb and Cs;X=Cl,Br and I;l,m,and n are integers.),have received increasing attention in the photoluminescen... Recently,inorganic copper-based halide perovskites and their derivatives(CHPs)with chemical formulas AlCumXn(A=Rb and Cs;X=Cl,Br and I;l,m,and n are integers.),have received increasing attention in the photoluminescence field,due to their lead-free,cost-effective,earth-abundant and low electronic dimensionality.Ascribed to flexible valence charge of Cu(Cu1+and Cu2+)and complex competing phases,the crystal structures and phase stabilities of CHPs are complicated and ambiguous,which limits their experimental applications.Via comprehensive first-principles calculations,we have investigated thermodynamic stabilities of possible crystal phases for AlCumXn by considering all the possible secondary phases existing in inorganic crystal structure database(ICSD).Our results are in agreement with existing experiments and further predicted the existence of 10 stable CHPs,i.e.Rb3 Cu2 Br5,Rb3 Cu2 I5,Rb Cu2 Cl3,Rb2 Cu I3,Rb2 Cu Br4,Rb Cu Br3,Rb3 Cu2 Br7,Cs3 Cu2 Br7,Cs3 Cu2 Cl7 and Cs4 Cu5 Cl9,which have not yet been reported in experiments.This work provides a phase and compositional map that may guide experiments to synthesize more novel inorganic CHPs with diverse properties for potential functional applications. 展开更多
关键词 FIRST-PRINCIPLES calculations copper-based halidE perovskite stability phase DIAGRAM
在线阅读 下载PDF
An atom-efficient electrosynthesis strategy for organic halides 被引量:1
8
作者 Yiwei Liu Xiaoxia Chang Bingjun Xu 《Chinese Journal of Catalysis》 2025年第11期170-181,共12页
Existing organic halide synthesis routes typically employ elemental halogens(X_(2),X=Cl or Br),leading to low atom economy and significant environmental pollution.In this work,we developed an atom efficient electrosyn... Existing organic halide synthesis routes typically employ elemental halogens(X_(2),X=Cl or Br),leading to low atom economy and significant environmental pollution.In this work,we developed an atom efficient electrosynthesis and separation strategy for halogenation reagents—N-chlorosuccinimide(NCS)and N-bromosuccinimide(NBS)—at high current densities.Faradic efficiency(FE)of 91.0%and 81.3%was achieved for NCS and NBS generation on RuO_(x)/TiO_(2)/Ti in a batch cell,respectively.Electrosynthesis of NCS likely involves both heterogeneous catalytic and homogeneous tandem pathways,while NBS is likely formed in a Langmuir-Hinshelwood mechanism with a proton-coupled electron transfer as the rate-determining step.A coupled continuous electrocatalytic synthesis and in situ separation setup was developed for the efficient production of NCS and NBS,which yielded 0.77 g of NCS in 12000 s and 0.81 g of NBS in 15000 s,both with relative purity exceeding 95%.The halogenation of acetone using NCS and NBS enabled gram-scale production of the key intermediate in organic synthesis,1-halogenacetone,with over 95%recovery of succinimide. 展开更多
关键词 ELECTROCATALYSIS Process intensification Halogenation reaction Organic halides synthesis N-CHLOROSUCCINIMIDE N-BROMOSUCCINIMIDE
在线阅读 下载PDF
The effect of electron-phonon coupling on the photoluminescence properties of zinc-based halides 被引量:1
9
作者 Zheyu Li Huwei Li +6 位作者 Yao Li Xinyu Fu Hongxia Yue Qingxing Yang Jing Feng Xinyu Wang Hongjie Zhang 《Chinese Chemical Letters》 2025年第4期467-471,共5页
Self-trapping excitons(STEs) emission in metal halides has been a matter of interest, correlating with the strength of electron-phonon coupling in the lattice, which are usually caused by ions with ns~2 electronic str... Self-trapping excitons(STEs) emission in metal halides has been a matter of interest, correlating with the strength of electron-phonon coupling in the lattice, which are usually caused by ions with ns~2 electronic structure. In this work, Sb^(3+)/Te^(4+)ions doped Zn-based halide single crystals(SCs) with two STEs emissions have been synthesized and the possibility of its anti-counterfeiting application was explored.Further, the relationship between the strength of electron-phonon coupling and photoluminescence quantum yields(PLQYs) for STEs in a series of metal halides has been studied. And the semi-empirical range of the Huang-Rhys factors(S) for metal halides with excellent photoluminescence(PL) property has been summarized. This work provides ideas for further research into the relationship between luminescence performance and electron-phonon coupling of metal halides, and also provides a reference for designing the metal halides with high PLQYs. 展开更多
关键词 Metal halides Electron-phonon coupling Huang-Rhys factor Self-trapping excitons ns~2 electrons
原文传递
Removal of elemental mercury from coal combustion flue gas by sodium halides impregnated red mud
10
作者 MUHAMMAD Sarfraz LI Yang +3 位作者 YANG He JIN Lijun LI Dekang HU Haoquan 《燃料化学学报(中英文)》 北大核心 2025年第1期53-69,共17页
Mercury removal from coal combustion flue gas remains a significant challenge for environmental protection due to the lack of cost-effective sorbents.In this study,a series of red mud(RM)-based sorbents impregnated wi... Mercury removal from coal combustion flue gas remains a significant challenge for environmental protection due to the lack of cost-effective sorbents.In this study,a series of red mud(RM)-based sorbents impregnated with sodium halides(NaBr and NaI)are presented to capture elemental mercury(Hg^(0))from flue gas.The modified RM underwent comprehensive characterization,including analysis of its textural qualities,crystal structure,chemical composition,and thermal properties.The results indicate that the halide impregnation substantially impacts the surface area and pore size of the RM.Hg^(0) removal performance was evaluated on a fixed-bed reactor in simulated flue gas(consisting of N_(2),O_(2),CO_(2),NO and SO_(2),etc.)on a modified RM.At an optimal adsorption temperature of 160℃,NaI-modified sorbent(RMI5)offers a removal efficiency of 98%in a mixture of gas,including O_(2),NO and HCl.Furthermore,pseudo-second-order model fitting results demonstrate the chemisorption mechanism for the adsorption of Hg^(0) in kinetic investigations. 展开更多
关键词 mercury removal red mud sodium halides IMPREGNATION flue gas
在线阅读 下载PDF
Research progress on the copper-based catalyst design for dimethyl oxalate hydrogenation to ethylene glycol
11
作者 Hansheng Wang Xintian Luo +6 位作者 Kaixuan Chen Benduan Xiao Xu Zhang Qingjun Meng Huibing He Jing Xu Yong Jin 《Chinese Journal of Chemical Engineering》 2025年第9期189-205,共17页
In this paper,the research progress of Cu-based catalyst and the activity enhancement strategies in the hydrogenation of dimethyl oxalate(DMO)to ethylene glycol(EG)was reviewed.As a green and economical ethylene glyco... In this paper,the research progress of Cu-based catalyst and the activity enhancement strategies in the hydrogenation of dimethyl oxalate(DMO)to ethylene glycol(EG)was reviewed.As a green and economical ethylene glycol production path,the core of DMO hydrogenation of EG lies in the rational design and optimization of catalysts.This paper first introduces the background of the DMO hydrogenation system EG significance and the important effect of Cu-based catalyst in the reaction,particularly emphasizing the coordination with the Cu^(+)-Cu^(0) species catalytic effect.Then,many factors affecting the activity of Cu-based catalysts were analyzed in detail,including the equilibrium effect between Cu^(0) and Cu+species,the surface dispersion of Cu species,the interaction between metal and support,and the morphology effect of the catalyst.Regarding strategies for improving catalyst performance,this paper summarized effective measures such as optimizing support structure,adding promoters and optimizing preparation methods,and demonstrated the practical application effects of these strategies through representative catalyst examples.In addition,this paper also discusses the complex relationship between the influencing factors and catalyst performance.It points out the key directions for future research,with in-depth exploration of the correlation between catalyst structure and performance,the development of new catalysts,and the application of machine learning and big data technology in the catalyst research and development.In summary,this paper provides comprehensive theoretical guidance and practical reference for the performance optimization of Cu-based catalysts for DMO hydrogenation to EG. 展开更多
关键词 copper-based catalyst Dimethyl oxalate HYDROGENATION CATALYSIS Multiphase reaction
在线阅读 下载PDF
Evaluating the feasibility of copper-based skeletons in lithium metal batteries operated at subzero temperature
12
作者 Yiyu Huang Ouwei Sheng +6 位作者 Qingyue Han Hongyan Li Lei Sun Qimeng Sheng Lijing Yan Zeheng Li Chengbin Jin 《Journal of Energy Chemistry》 2025年第5期765-772,共8页
The next-generation lithium(Li)metal batteries suffer severe low-temperature capacity degradation,appealing for expeditions on solutions.Herein,the feasibility of copper-based skeletons(i.e.,2D Cu foil,3D Cu mesh,and ... The next-generation lithium(Li)metal batteries suffer severe low-temperature capacity degradation,appealing for expeditions on solutions.Herein,the feasibility of copper-based skeletons(i.e.,2D Cu foil,3D Cu mesh,and CuZn mesh)frequently adopted in the stabilization of Li are evaluated at low temperatures.Li growth patterns and stripping behaviors on different skeletons and at different temperatures uncover the dendrite-free and dead-Li-less Li deposition/dissolution on CuZn mesh.Three-electrode impedance indicates the dynamic advantages of CuZn mesh,driving fast Li^(+)crossing through solidelectrolyte-interphase and charge transfer process.Notably,CuZn mesh enables the stable operation and fast charging(1.8 mA cm^(-2))of Li||LiFePO_(4)cells for over 120 cycles at-10℃ with a superior capacity retention of 88%.The success of CuZn mesh can be translated into lower temperature(-20℃)and 1.0-Ah-level pouch cells.This work provides fundamentals on improving low-temperature battery performances by skeletons with regulated spatial structure and lithiophilicity. 展开更多
关键词 Low temperature Lithium metal battery copper-based skeleton
在线阅读 下载PDF
Linear paired electrolysis enables redox-neutral benzylation of N-heteroarenes with benzyl halides using ion resin as the recyclable electrolyte
13
作者 Yan-Cui Wen Jia-Cheng Hou +6 位作者 Qian Zhou Sheng-Hua Wang Jun Jiang Zi Yang Hai-Tao Zhu Zu-Li Wang Wei-Min He 《Chinese Chemical Letters》 2025年第12期251-255,共5页
Herein,we have developed a sustainable linear paired electrolysis strategy for the redox-neutral benzylation of N-heteroarenes with benzyl halides using solid ion resin as the recyclable electrolyte.This method suffic... Herein,we have developed a sustainable linear paired electrolysis strategy for the redox-neutral benzylation of N-heteroarenes with benzyl halides using solid ion resin as the recyclable electrolyte.This method sufficiently utilizes both cathodic and anodic reactions to produce a variety of benzylated Nheteroarenes,features high atom-and step-economy,excellent energy efficiency,operational simplicity,good functional group tolerance,mild conditions and no requirement of sacrifice reagent and base additive.Importantly,the inexpensive and commercially available solid ion resin electrolyte was validated in both gram-scale synthesis and electrolyte cycling experiment.We hope this strategy not only provides a sustainable synthetic strategy for benzylated compounds but also develops the further utilization of ion resin in electrosynthesis as well as linear paired electrolysis. 展开更多
关键词 Paired electrolysis Benzyl halides BENZYLATION N-Heteroarenes Redox-neutral
原文传递
Structural regulation and optical behavior of zero-dimensional Cu(Ⅰ)-based organometallic halides under pressure
14
作者 Runnan Ye Jingtian Wang +6 位作者 Jiayi Yang Xuchen Wang Junce Lei Wenya Zhao Yufan Meng Guanjun Xiao Bo Zou 《Chinese Physics B》 2025年第6期54-58,共5页
Low-dimensional hybrid metal halides exhibit broadband emission and high photoluminescence quantum yield(PLQY), making them promising candidates for the next-generation luminescent materials in lighting applications. ... Low-dimensional hybrid metal halides exhibit broadband emission and high photoluminescence quantum yield(PLQY), making them promising candidates for the next-generation luminescent materials in lighting applications. Here,the emission intensity of(C_(12)H_(24)O_(6))_(2)Na_(2)(H_(2)O)_(3)Cu_(4)I_(6) was strengthened between 9.3 GPa and 17.2 GPa, accompanied by the redshift of emission wavelength. The photoluminescence(PL) of Cu(Ⅰ)-based organometallic halides originates from multiple emission states, which are a metal-to-ligand charge transfer or a halide-to-ligand charge transfer(MLCT/HLCT)excited state and a cluster-centered(CC) excited state. MLCT/HLCT-related emission wavelength redshifts while CCrelated emission wavelength remains unchanged, indicating that the rearrangement of different emission states plays a critical role in the changes of luminescence wavelength. This study not only deepens the understanding of the influence of high pressure on(C_(12)H_(24)O_(6))_(2)Na_(2)(H_(2)O)_(3)Cu_(4)I_(6), but also provides valuable insights into the structure–property relationship of zero-dimensional Cu(Ⅰ)-based organometallic halides. 展开更多
关键词 low-dimensional Cu-based halides high pressure REDSHIFT REARRANGEMENT
原文传递
Insight into the activation of peroxymonosulfate by N-doped copper-based carbon for efficient degradation of organic pollutants:Synergy of nonradicals
15
作者 Mengmeng Ao Jian Wei +4 位作者 Chuan-Shu He Heng Zhang Zhaokun Xiong Yonghui Song Bo Lai 《Chinese Chemical Letters》 2025年第1期513-520,共8页
The contamination of water resources by phenolic compounds(PCs)presents a significant environmental hazard,necessitating the development of novel materials and methodologies for effective mitigation.In this study,a me... The contamination of water resources by phenolic compounds(PCs)presents a significant environmental hazard,necessitating the development of novel materials and methodologies for effective mitigation.In this study,a metallic copper-doped zeolitic imidazolate framework was pyrolyzed and designated as CuNC-20 for the activation of peroxymonosulfate(PMS)to degrade phenol(PE).Cu-NC-20 could effectively address the issue of metal agglomeration while simultaneously diminishing copper dissolution during the activation of PMS reactions.The Cu-NC-20 catalyst exhibited a rapid degradation rate for PE across a broad pH range(3-9)and demonstrated high tolerance towards coexisting ions.According to scavenger experiments and electron paramagnetic resonance analysis,singlet oxygen(^(1)O_(2))and high-valent copperoxo(Cu(Ⅲ))were the predominant reactive oxygen species,indicating that the system was nonradicaldominated during the degradation process.The quantitative structure-activity relationship(QSAR)between the oxidation rate constants of various substituted phenols and Hammett constants was established.It indicated that the Cu-NC-20/PMS system had the optimal oxidation rate constant withσ^(-)correlation and exhibited a typical electrophilic reaction pattern.This study provides a comprehensive understanding of the heterogeneous activation process for the selective removal of phenolic compounds. 展开更多
关键词 N-doped copper-based carbon Phenolic compounds PEROXYMONOSULFATE Nonradical pathway Quantitative structure-activity relationship(QSAR)
原文传递
Extraction of rare earth elements from neodymium(NdFeB) magnet scrap using magnesium halides
16
作者 Sung Gue Heo Jae Yeol Yang +3 位作者 Soong Ju Oh Seok-Jun Seo Mi Hye Lee Kyoung-Tae Park 《Journal of Rare Earths》 2025年第2期371-376,I0006,共7页
The demand for neodymium(NdFeB) permanent magnets for electric vehicles and eco-friendly generators is increasing.However,NdFeB magnets contain rare earth elements(REEs),which are limited in supply.In this study,we pe... The demand for neodymium(NdFeB) permanent magnets for electric vehicles and eco-friendly generators is increasing.However,NdFeB magnets contain rare earth elements(REEs),which are limited in supply.In this study,we performed an exchange reaction between magnesium halides(fluoride and chloride) and waste NdFeB scrap and then compared the characteristics of the extracted halides salts.The compositions of the ternary Mg fluoride(LiF:NaF:MgF_(2)=50:40:10 in mole ratio) and chloride(LiCl:NaCl:MgCl_(2)=10:50:40 in mole ratio) salts were thermodynamically determined for achieving low eutectic temperatures.The reactions between the NdFeB scrap powder(1-2 mm) and Mg halide salts were carried out at 1073 and 873 K for the fluoride and chloride systems,respectively,in an argon atmosphere.After the reaction,we separated Nd halide from the residual salt and evaluated the Ndextraction rate.The phase formation of the salt was analyzed using X-ray diffraction(XRD),and the extraction rate of Nd was analyzed using inductively coupled plasma optical emission spectroscopy(ICPOES).Nd was extracted in the form of Nd halide(NdF_(3) or NdCl_(3)),and the extraction rates in the fluoride and chloride systems are 98.64% and 84.59%,respectively.Thus,the fluoride system is more effective than the chloride system for Nd extraction.Our study provides a comprehensive comparative analysis of the effectiveness of fluo ride and chlo ride systems in extracting REEs from NdFeB magnet scrap.Our study findings can be used to develop an effective method for recycling magnet scraps. 展开更多
关键词 Rare earth elements Neodymium magnet Nd extraction Magnesium halide Metal-scrap recycling Fluoride system
原文传递
Discovery of a liquid crystal phase of sodium halides via a nonclassical nucleation pathway
17
作者 Jaehyeong Bae Bong Lim Suh +2 位作者 Hamin Shin Jihan Kim Il-Doo Kim 《Advanced Powder Materials》 2025年第6期50-61,共12页
The crystallization of ionic crystals has traditionally been explained by Gibbs's classical nucleation theory.However,recent observations of intermediate phases during nucleation suggest that the process may be mo... The crystallization of ionic crystals has traditionally been explained by Gibbs's classical nucleation theory.However,recent observations of intermediate phases during nucleation suggest that the process may be more complex,necessitating new theoretical frameworks,though key empirical evidence remains elusive.In this study,we used microdroplets to investigate the crystallization of sodium halides(NaCl,NaBr,and NaI)under homogeneous nucleation conditions across a wide range of supersaturations.In the evaporating droplet,NaCl follows the classical nucleation pathway,whereas NaBr and NaI exhibit the formation of an intermediate phase prior to the nucleation of anhydrous and hydrous single crystals,respectively.Optical and computational analyses indicate that these intermediate phases are liquid crystal phases composed of contact ion pairs.These findings establish a new theoretical framework for crystal nucleation and growth and offer methods to control nucleation pathways,enabling us to achieve desired crystals regardless of specific conditions. 展开更多
关键词 Nonclassical nucleation theory Two-step nucleation Sodium halides Liquid crystal phase Contact ion pairs Birefringence MICRODROPLETS
在线阅读 下载PDF
Dual-band-tunable all-inorganic Zn-based metal halides for optical anti-counterfeiting
18
作者 Meng Wang Dehai Liang +3 位作者 Saif M.H.Qaid Shuangyi Zhao Yingjie Liu Zhigang Zang 《Opto-Electronic Advances》 2025年第10期30-39,共10页
Low-dimensional lead-free metal halides have emerged as promising candidates for anti-counterfeiting applications,characterized by their low toxicity,diverse crystal structures,and exceptional optical properties.Conve... Low-dimensional lead-free metal halides have emerged as promising candidates for anti-counterfeiting applications,characterized by their low toxicity,diverse crystal structures,and exceptional optical properties.Conventional anti-counterfeiting technologies based on low-dimensional metal halides are often constrained by complex and time-consuming heating and solvent treatments that may insufficiently modify the luminescent characteristics of emitters,thus hindering their practical implementation in effective anti-counterfeiting strategies.In this study,we employ an innovative alloying strategy in low-dimensional zinc halides Cs_(2)ZnCl_(4) to enhance their luminescent performance.By introducing self-trapped exciton(STE)states through the alloying of Cu^(+)and Sb^(3+)ions in Cs_(2)ZnCl_(4),we achieve bright blue and red photoluminescence(PL)centered at 492 nm and 744 nm,respectively,under 266 nm excitation,with only red emission observed under 365 nm excitation.This approach enables instant and reliable anti-counterfeiting applications.This work presents new opportunities for developing robust anti-counterfeiting and information encryption/decryption technologies. 展开更多
关键词 Zn-based metal halides dual-band emission optical anti-counterfeiting Cu^(+)and Sb^(3+)doping
在线阅读 下载PDF
Halide Perovskite Heterostructures for High-Performance Light-Emitting Diodes
19
作者 Yiming Huo Tingwei He +2 位作者 Shaopeng Yang Yuanzhi Jiang Changjiu Sun 《Nano-Micro Letters》 2026年第6期222-252,共31页
Metal halide perovskites have emerged as highly promising candidates for the emissive layer in next-generation light-emitting diodes(LEDs)due to their narrow emission linewidths,high photoluminescence quantum yields,a... Metal halide perovskites have emerged as highly promising candidates for the emissive layer in next-generation light-emitting diodes(LEDs)due to their narrow emission linewidths,high photoluminescence quantum yields,and tunable emission wavelengths.Achieving high-performance perovskite LEDs(Pe LEDs)requires the emissive layer to possess efficient radiative recombination,low defect density,minimal ion mobility,and effective carrier confinement.Perovskite/perovskite heterostructure(PPHS)offers a compelling approach for engineering emissive layers with these desired attributes,owing to their ability to passivate surface defects,tailor bandgaps,and suppress ion migration.Pe LEDs based on PPHS have demonstrated superior performance compared to single-phase devices,particularly in terms of external quantum efficiency and operational stability.This review provides a comprehensive overview of the typical PPHS architectures applied in Pe LEDs,including vertical,lateral,and bulk configurations.We discuss representative fabrication strategies and the associated optoelectronic properties of these heterostructures,highlighting the mechanisms by which they enhance device efficiency and stability.Finally,we explore the remaining challenges and prospects for the application of PPHS in Pe LEDs and other luminescent technologies. 展开更多
关键词 halide perovskite HETEROSTRUCTURE ELECTROLUMINESCENCE Perovskite light-emitting diode
在线阅读 下载PDF
Gas‑Phase Construction of Compact Capping Layers for High‑Performance Halide Perovskite X‑Ray Detectors
20
作者 Bin Zhang Chuanyun Hao +17 位作者 Shoufeng Zhang Bin Xue Xiangfan Xie Shengqiao Zeng Bin Yang Fang Xu Hui Li Xin’an Zhang Zhang Qu Kai‑Hang Ye Guangda Niu Wallace CHChoy Kezhou Fan Kam Sing Wong Lei Yan Xingzhu Wang Shuang Xiao Cangtao Zhou 《Nano-Micro Letters》 2026年第3期388-405,共18页
Halide perovskites have emerged as promising materials for X-ray detection with exceptional properties and reasonable costs.Among them,heterostructures between 3D perovskites and low-dimensional perovskites attract in... Halide perovskites have emerged as promising materials for X-ray detection with exceptional properties and reasonable costs.Among them,heterostructures between 3D perovskites and low-dimensional perovskites attract intensive studies of their advantages due to low-level ion migration and decent stability.However,there is still a lack of methods to precisely construct heterostructures and a fundamental understanding of their structure-dependent optoelectronic properties.Herein,a gas-phase method was developed to grow 2D perovskites directly on 3D perovskites with nanoscale accuracy.In addition,the larger steric hindrance of organic layers of 2D perovskites was proved to enable slower ion migration,which resulted in reduced trap states and better stability.Based on MAPbBr_(3)single crystals with the(PA)_(2)PbBr_(4)capping layer,the X-ray detector achieved a sensitivity of 22,245μC Gy_(air)^(−1)cm^(−2),a response speed of 240μs,and a dark current drift of 1.17.10^(–4)nA cm^(−1)s^(−1)V^(−1),which were among the highest reported for state-of-the-art perovskite-based X-ray detectors.This study presents a precise synthesis method to construct perovskite-based heterostructures.It also brings an in-depth understanding of the relationship between lattice structures and properties,which are beneficial for advancing high-performance and cost-effective X-ray detectors. 展开更多
关键词 halide perovskite Ion migration Interface HETEROSTRUCTURE X-ray detection
在线阅读 下载PDF
上一页 1 2 109 下一页 到第
使用帮助 返回顶部