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Approaching strain limit of two-dimensional MoS_(2) via chalcogenide substitution

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Science Bulletin 2022年第1期67卷 45-53,M0004页

作者： Kailang Liu Xiang Chen Penglai Gong Ruohan Yu Jinsong Wu Liang Li Wei Han Sanjun Yang Chendong Zhang Jinghao Deng Aoju Li Qingfu Zhang Fuwei Zhuge Tianyou Zhai State Key Laboratory of Materials Processing and Die&Mould Technology School of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhan 430074China Nano and Heterogeneous Materials Center School of Materials Science and EngineeringNanjing University of Science and TechnologyNanjing 210094China Department of Physics Southern University of Science and TechnologyShenzhen 518055China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Nanostructure Research CenterWuhan University of TechnologyWuhan 430070China Institutes of Physical Science and Information Technology Anhui UniversityHefei 231699China School of Physics and Technology Wuhan UniversityWuhan 430072China

Strain engineering is a promising method for tuning the electronic properties of two-dimensional(2 D)materials,which are capable of sustaining enormous strain thanks to their atomic ***,applying a large and homogeneous strain on these 2D materials,including the typical semiconductor MoS_(2),remains *** we report a facile strategy for the fabrication of highly strained MoS_(2) via chalcogenide substitution reaction(CSR)of MoTe_(2) with lattice *** MoS_(2)resulting from the sulfurized MoTe_(2) sustains ultra large in-plane strain(approaching its strength limit~10%)with great ***,the strain can be deterministically and continuously tuned to~1.5%by simply varying the processing *** to the fine control of our CSR process,we demonstrate a heterostructure of strained MoS_(2)/MoTe_(2)with abrupt ***,we verify that such a large strain potentially allows the modulation of MoS_(2) bandgap over an ultra-broad range(~1 e V).Our controllab.e CSR strategy paves the way for the fabrication of highly strained 2D materials for applications in devices.

关键词： Strain engineering 2D materials Chalcogenide substitution Controllab.e strain Lattice inheritance

CdS nanosheets decorated with Ni@graphene core-shell cocatalyst for superior photocatalytic H_(2) production

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Journal of materials Science & technology 2020年第21期56卷 170-178页

作者： Tingmin Di Liuyang Zhang Bei Cheng Jiaguo Yu Jiajie Fan School of Materials Science and Engineering Wuhan Institute of TechnologyWuhan 430205China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China School of Materials Science and Engineering Zhengzhou UniversityZhengzhou 450002China

A novel cocatalyst,*** nickel nanoparticles encapsulated in few-layer graphene(Ni@C),is obtained by carbonization of metal–organic frameworks(MOF)and leaching treatment of hydrochloric *** is selected as the cocatalyst for CdS nanosheets,forming CdS-Ni@C *** remarkably improves the photocatalytic activities of CdS nanosheets due to the synergistic effect of Ni nanoparticles and graphene *** addition,the Ni nanoparticles encapsulated by graphene layers effectively isolate Ni from the ambient,which avoids contamination and curbs *** larger work function of Ni@C and outstanding conductivity of graphene promote the electron transfer from CdS to Ni@C,suppressing the recombination of photogenerated carriers and facilitating the separation of photogenerated electronhole *** strategy by adopting this novel cocatalyst provides a new solution to the improvement of the photocatalytic hydrogen production.

关键词： CdS nanosheets Photocatalytic hydrogen production Nickel Graphene Core-shell cocatalyst Metal-organic frameworks(MOF)

Bromine-Defect Induced High Sensitivity of Cs4PbBr6 Nanocrystals Humidity Sensor

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SSRN 2024年

作者： Liu, Yueli Guo, Hongbing Mei, Aohan Chen, Keqiang Chen, Wen State Key Laboratory of Silicate Materials for Architectures School of Materials Science and Engineering Wuhan University of Technology Wuhan430070 China Sanya Science and Education Innovation Park Wuhan University of Technology Sanya572024 China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing School of Materials Science and Engineering Wuhan University of Technology Wuhan430070 China Faculty of Materials Science and Chemistry China University of Geosciences Wuhan430074 China

Recently, all-inorganic halide perovskite materials have attracted much attention in the fields of humidity sensor due to their sensitive surface, tunable bandgap, high conductivity and excellent carrier mobility. However, their inherent instability and limited sensitivity restrict further application in electronic devices. Herein, we demonstrate a high-performance impedimetric humidity sensor based on an all-inorganic halide perovskite Cs4PbBr6 nanocrystals (NCs), which are obtained by anti-solvent method without long chain ligands. It is found that Br vacancy defects act as the active site to enhance the ability of adsorbing water molecules. The humidity sensor of Cs4PbBr6 NCs achieves high response value over 4 orders of magnitude at 11-98% relative humidity, short response/recovery time (8 s/6 s), favorable repeatability, excellent selectivity and good long-term stability. Moreover, high humidity sensing performance enables the humidity sensor of Cs4PbBr6 NCs to possess great potentials in breath monitor and noncontact switch application. © 2024, The Authors. All rights reserved.

关键词： Bromine compounds

Bromine-Defect Induced High Sensitivity of Cs4pbbr6 Nanocrystals Humidity Sensor

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SSRN 2024年

关键词： Bromine compounds

A promising protective layer towards practical lithium metal batteries

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Science Bulletin 2022年第17期67卷 1732-1734页

作者： Wenyi Liu Jinping Liu State Key Laboratory of Advanced Technology for Materials Synthesis and Processing School of ChemistryChemical Engineering and Life ScienceWuhan University of TechnologyWuhan 430070China State Center for International Cooperation on Designer Low-carbon&Environmental Materials School of Materials Science and EngineeringZhengzhou UniversityZhengzhou 450001China

Li metal batteries(LMBs)are regarded as promising future high-energy batteries,but their practical application under the conditions of high current density and large areal capacity is impeded by Li dendrite growth and low Coulombic efficiency(CE)[1–4].This is largely due to the structural heterogeneity and mechanical fragility of the native solid-electrolyte interphase(SEI)formed in situ on the Li metal surface,which cannot stabilize and protect the Li anode[5–7].

关键词： electrolyte anode 锂金属

Influence of Lattice Strain on the Mechanical Properties of Cosb3 Skutterudites

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SSRN 2023年

作者： Duan, Bo Li, Jialiang Zhang, Xiaolian Li, Guodong Ma, Yuxi Xu, Hao School of Civil Engineering & Architecture Wuhan Polytechnic University Wuhan430023 China Hubei Key Laboratory of Theory and Application of Advanced Materials Mechanics Wuhan University of Technology Wuhan430070 China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan430070 China

Elemental doping has been widely employed to manipulate the electrical and thermal transport properties of thermoelectric materials, without considering the influence to mechanical properties. In skutterudites, electronegative S-dopants have been found to reduce the lattice thermal conductivity. However, the effect of the covalent S-Sb bond on the mechanical properties of CoSb3 skutterudites remains unexplored. Compressive strength, in particular, exhibits a significant reduction in S-doped skutterudites, measuring only 249 MPa, representing a nearly 50% decrease compared to binary skutterudites. Additionally, there is a noticeable drop in the elastic, bulk and shear modulus. With molecular dynamics calculations, the shear strength of S-doped skutterudites also follows a sharp drop at a small ultimate strain. The evolutions of atomic configurations reveal that the lattice strain induced by S-dopants softens the Sb-Sb bond, ultimately leading to structure collapse under low shear stress conditions. These findings underscore the necessity for a comprehensive approach to elemental doping in thermoelectric community. © 2023, The Authors. All rights reserved.

关键词： Strain

Effect of Additive Content on Texture Evolution and Mechanical Properties of Si3N4 Ceramics Prepared by Hot Pressing

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SSRN 2023年

作者： Shi, Yunwei He, Qianglong Wang, Aiyang Ren, Yichao Wang, Jinghan Wang, Hao Wang, Weimin Fu, Zhengyi State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan430070 China School of Materials Science and Engineering Wuhan University of Technology Wuhan430070 China Hubei Longzhong Laboratory Hubei Xiangyang441000 China

The purpose of this research is to investigate influence of additive content on sintering behavior, texture evolution and mechanical properties of Si3N4 ceramics systematically. Si3N4 ceramics with different additive contents are prepared by hot pressing at 1750 °C for 1h. XRD analysis confirms that the densification process is dominated by particle rearrangement instead of phase transformation. Grain morphology characterization demonstrates that additive content affects relative amount between textured [[EQUATION]]-Si3N4 grains and [[EQUATION]]-Si3N4 nuclei during initial sintering. During subsequent sintering, [[EQUATION]]-Si3N4 nuclei surrounded by residual liquid phase elongated randomly, and then weaken texture degree of Si3N4 ceramics. The texture degree of Si3N4 ceramics decreases first and then increases as additives increase steadily. Based on the CTE misfit model and the stochastic model of crack propagation, texture degree, residual stress and grain size have a synergistic effect on crack propagation behavior of [[EQUATION]]-Si3N4 ceramics. The outstanding flexural strength (1096 MPa) and fracture toughness (10.61 MPa[[EQUATION]]m1/2) is achieved in hot pressed SN21 with a relatively high texture degree (fL=0.213). © 2023, The Authors. All rights reserved.

关键词： Ductile fracture

The Combined Sol-Gel and Ascorbic Acid Reduction Strategy Enabling Ba2Co2Fe12O22 Hexaferrite/Graphene Composite with Enhanced Microwave Absorption Ability

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SSRN 2023年

作者： He, Yu Wang, Ruoqi Wu, Xiaohan Tang, Chuanhao Qian, Jun Zuo, Peiyuan Zhuang, Qixin Liu, Xing Key Laboratory of Special Functional Polymeric Materials and Related Technology Ministry of Education School of Materials Science and Engineering East China University of Science and Technology Shanghai200237 China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing School of Materials Science and Engineering Wuhan University of Technology Wuhan430070 China

Graphene featuring low density and high specific surface area, is highly suitable for loading ferrite nanoparticles. However, the current efficient reducing graphene method in fabricating ferrite/graphene composites require high temperatures/pressures, ae well as highly toxic and explosive reducing agents. We herein propose a strategy for synthesizing Ba2Co2Fe12O22 hexaferrite/graphene composite MAMs by mildly reducing graphene oxide using ascorbic acid. This method enables the reduced graphene oxide with comparable C/O ratios and conductivity comparing to that achieved by other reduction methods. The proper mass ratio of graphene oxide to ferrite particles (1:2) and optimized electromagnetic parameters endow the microwave absorbing materials with a minimum reflection loss value of approximately -45.25 dB and an effective bandwidth of around 4.75 GHz. The simulation calculations are further investigated to verify the practical application of this absorber. Accordingly, it is reasonable to conclude this study provides a new synthetic approach on advanced ferrite/graphene composite based MAMs. © 2023, The Authors. All rights reserved.

关键词： Iron compounds

Boosting carrier dynamics of BiVO_(4) photoanode via heterostructuring with ultrathin BiOI nanosheets for enhanced solar water splitting

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Journal of materials Science & technology 2021年第20期79卷 21-28页

作者： Can Li Fan Feng Jie Jian Youxun Xu Fan Li Hongqiang Wang Lichao Jia Key Laboratory of Applied Surface and Colloid Chemistry National Ministry of EducationShaanxi Key Laboratory for Advanced Energy DevicesShaanxi Engineering Lab for Advanced Energy TechnologySchool of Materials Science and EngineeringShaanxi Normal University620 West Chang’an StreetXi’anShaanxi710119China State Key Laboratory of Solidification Processing Center for Nano Energy MaterialsSchool of Materials Science and EngineeringNorthwestern Polytechnical University and Shaanxi Joint Labortary of GrapheneXi’an710072China

Bismuth vanadate(BiVO_(4))has been one of the most promising candidates for solar water splitting while still suffers from poor bulk charge transport that limits its solar to hydrogen conversion *** demonstrate in this work an efficient strategy for boosting bulk charge transport of BiVO_(4) through the facile impregnation of as-prepared BiVO_(4) photoanode in the precursor solution of ultrathin BiOI *** impregnation creates increased oxygen vacancies in the bulk of BiVO_(4) through the reduction of V^(5+)to V^(4+)by I^(-),which greatly improves bulk separation efficiency for BiVO_(4)-BiOI up to 65.9%at 1.23 V_(RHE) from the original 51.9%of pure BiVO_(4).Moreover,the decoration of the BiOI nanosheets on BiVO_(4) photoanode is also beneficial for addressing the carrier dynamics at surface due to the matched energy levels of BiOI nanosheets and BiVO_(4).The introduced plenty of oxygen vacancies in the bulk of BiVO_(4) and the built-in electric field in BiVO_(4)-BiOI synergistically improve the photocurrent density at 1.23 V_(RHE) up to 3.88 mA cm^(-2).We believe that such facile impregnation strategy will pave an alternative way to the development of highly efficient BiVO_(4) photoanode.

关键词： Bismuth vanadate BiOI nanosheets Heterojunction Solution impregnation Oxygen vacancy