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Enhanced photoresponse of Ti0_(2)/MoS_(2)heterostructure phototransistors by the coupling of interface charge transfer and photogating

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Nano Research 2021年第4期14卷 982-991页

作者： Bingxu Liu Yinghui Sun Yonghuang Wu Kai Liu Huanyu Ye Fangtao Li Limeng Zhang Yong Jiang Rongming Wang Beijing Advanced Innovation Center for Materials Genome Engineering Beijing Key Laboratory for Magneto-Photoelectrical Composite and Interface ScienceSchool of Mathematics and PhysicsUniversity of Science and Technology BeijingBeijing 100083China State Key Laboratory of New Ceramics and Fine Processing School of Materials Science and EngineeringTsinghua UniversityBeijing 100084China School of Materials Science and Engineering University of Science and Technology BeijingBeijing 100083China

Two-dimensional(2D)MoS_(2)with appealing physical properties is a promising candidate for next-generation electronic and optoelectronic devices,where the ultrathin MoS_(2)is usually laid on or gated by a dielectric oxide *** oxide/MoS_(2)interfaces widely existing in these devices have significant impacts on the carrier transport of the MoS_(2)channel by diverse interface *** design of the oxide/MoS_(2)interfaces would provide an effective way to break through the performance limit of the 2D devices but has yet been well ***,we report a high-performance MoS_(2)-based phototransistor with an enhanced photoresponse by interfacing few-layer MoS_(2)with an ultrathin Ti0_(2)*** Ti0_(2)is deposited on MoS_(2)through the oxidation of an e-beam-evaporated ultrathin Ti *** a visible-light illumination,the fabricated Ti0_(2)/MoS_(2)phototransistor exhibits a responsivity of up to 2,199 A/W at a gate voltage of 60 V and a detectivity of up to 1.67×10^(13)Jones at a zero-gate voltage under a power density of 23.2μW/mm^(2).These values are 4.0 and 4.2 times those of the pure MoS_(2)*** significantly enhanced photoresponse of Ti0_(2)/MoS_(2)device can be attributed to both interface charge transfer and photogating *** results not only provide valuable insights into the interactions at Ti0_(2)/MoS_(2)interface,but also may inspire new approach to develop other novel optoelectronic devices based on 2D layered materials.

关键词： MoS_(2) heterojunction photodetector charge injection photocurrent

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Preparation and Molecular Simulation of Hyper-Dispersant Modified Bn Filled Natural Rubber Thermally Conductive Composite

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SSRN 2024年

作者： Wang, Zhen Li, Zhenlu Lin, Xinfeng Zheng, Long Li, Ziwei Lu, Shaorong Key Laboratory of New Processing Technology for Nonferrous Metals and Materials Ministry of Education School of Material Science and Engineering Guilin University of Technology Guilin541004 China Hubei Key Laboratory for New Textile Materials and Applications College of Materials Science and Engineering Wuhan Textile University Wuhan430200 China Guangxi Colleges Universities Key Laboratory of Natural and Biomedical Polymer Materials Guilin University of Technology School of Material Science and Engineering Guilin University of Technology Guilin541004 China

Non-covalent modification of fillers with hyperdispersants in composite processing avoids destroying the regular structure of the filler and is simpler and easier to operate than ordinary surface modification methods. A novel hyperdispersant, GI-g-PHA, was synthesized by esterification of poly12-hydroxystearic acid (PHA) and glycerol (GI) to improve the thermal conductivity (TC) and tensile properties of natural rubber (NR)/boron nitride (BN) composites. After the addition of 5 wt% hyperdispersant, the thermal conductivity of 20 vol% and 25 vol% BN composites was 0.965 W/mK and 1.364 W/mK, respectively, which was 9.6 and 13.6 times higher than that of NR matrix (0.1 W/mK). Molecular dynamics simulations showed an increase in molecular binding energy and a decrease in free volume fraction after the addition of dispersant, which provided a microscopic explanation for the change in compatibility. This study provides a way to prepare polymer matrix composites with high thermal conductivity and high strength. © 2024, The Authors. All rights reserved.

关键词： Molecular dynamics

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Preparation and Molecular Simulation of Hyper-Dispersant Modified Bn Filled Natural Rubber Thermally Conductive Composite

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SSRN 2024年

作者： Wang, Zhen Li, Ziwei Li, Zhenlu Lin, Xinfeng Zheng, Long Lu, Shaorong Key Laboratory of New Processing Technology for Nonferrous Metals and Materials Ministry of Education School of Material Science and Engineering Guilin University of Technology Guilin541004 China Hubei Key Laboratory for New Textile Materials and Applications College of Materials Science and Engineering Wuhan Textile University Wuhan430200 China Guangxi Colleges Universities Key Laboratory of Natural and Biomedical Polymer Materials Guilin University of Technology School of Material Science and Engineering Guilin University of Technology Guilin541004 China

关键词： Molecular dynamics

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双功能Nb-N-C原子分散催化剂用于水系锌-空气电池驱动CO_(2)还原

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Science China materials 2023年第3期66卷 1013-1023页

作者：高三双王天玮靳梦梦张书胜刘倩胡广志杨慧罗俊刘熙俊 Institute for New Energy Materials and Low-Carbon Technologies Tianjin Key Lab for Photoelectric Materials&DevicesSchool of Materials Science and EngineeringTianjin University of TechnologyTianjin 300384China MOE Key Laboratory of New Processing Technology for Non-Ferrous Metals and Materials and Guangxi Key Laboratory of Processing for Non-Ferrous Metals and Featured MaterialsSchool of ResourceEnvironments and MaterialsGuangxi UniversityNanning 530004China College of Chemistry Zhengzhou UniversityZhengzhou 450000China Institute for Advanced Study Chengdu UniversityChengdu 610106China Institute for Ecological Research and Pollution Control of Plateau Lakes School of Ecology and Environmental Science Yunnan UniversityKunming 650504China Shenzhen Institute for Advanced Study University of Electronic Science and Technology of ChinaShenzhen 518110China

设计廉价和高效的双功能催化剂应用于CO_(2)还原和O_(2)还原反应(CO_(2)RR和ORR)是实现碳中和的理想选择.因此,本文研制出铌原子分散固定在氮掺杂有序介孔碳(Nb-N-C)上的双功能CO_(2)RR和ORR催化剂用于锌-空气电池(ZAB)自驱动CO_(2)RR.... 详细信息

设计廉价和高效的双功能催化剂应用于CO_(2)还原和O_(2)还原反应(CO_(2)RR和ORR)是实现碳中和的理想选择.因此,本文研制出铌原子分散固定在氮掺杂有序介孔碳(Nb-N-C)上的双功能CO_(2)RR和ORR催化剂用于锌-空气电池(ZAB)自驱动CO_(2)RR.得益于高铌原子利用率和有序介孔结构,Nb-N-C催化剂展现出高达90%的CO法拉第效率,ORR的半波电位活性为0.84 V,ZAB的峰值功率活性为115.6 mW cm-2.此外,采用两个串联的ZABs单元作为自供能CO_(2)RR系统的电源,能够连续将C O_(2)转化为C O.该自供能系统前10小时的C O平均产率为3.75μmol h-1mg-1cat.理论计算表明,铌原子分散固定在氮掺杂的碳上形成Nb–N配位键,从而有效地降低CO_(2)RR的决速中间体*COOH和ORR的决速中间体*O的生成能垒.

关键词：有序介孔碳配位键还原反应双功能催化剂半波电位原子利用率氮掺杂能垒

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Electrochemically and chemically in-situ interfacial protection layers towards stable and reversible Zn anodes

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Science Bulletin 2025年第1期70卷 104-124页

作者： Yuqing Yang Liping Qin Qiong He Chengjie Yin Yongpeng Lei Shuquan Liang Guozhao Fang School of Materials Science and Engineering Key Laboratory of Electronic Packaging and Advanced Functional Materials of Hunan ProvinceCentral South UniversityChangsha 410083China College of Biological and Chemical Engineering Guangxi University of Science and TechnologyNanning 545006China School of Chemical and Blasting Engineering Anhui University of Science and TechnologyHuainan 232001China State Key Laboratory of Powder Metallurgy Central South UniversityChangsha 410083China National Energy Metal Resources and New Materials Key Laboratory Central South UniversityChangsha 410083China

Aqueous zinc metal batteries(AZMBs)have received widespread attention for large-scale sustainable energy storage due to their low toxicity,safety,***,the technology and industrialization of AZMBs are greatly plagued by issues of Zn anode such as persistent dendrites and parasitic side reactions,resulting in rapid capacity degradation or battery *** or chemically in-situ interfacial protection layers have very good self-adaption features for stability and reversibility of Zn anodes,which can also be well matched to current battery ***,the in-situ interfacial strategies are far from the practical design for effective Zn ***,a targeted academic discussion that serves the development of this field is very ***,the comprehensive insights on electrochemically and chemically in-situ interfacial protection layers for Zn anode were proposed in this *** showcased a systematic summary of research advances,followed by detailed discussions on electrochemically and chemically in-situ interfacial protection *** importantly,several crucial issues facing in-situ interfacial protection strategies have been further put *** final section particularly highlighted a systematic and rigorous scheme for precise designing highly stable and reversible in-situ interface for practical zinc anodes.

关键词： In-situ strategy Interfacial layer Zn anode Solid electrolyte interphase Aqueous zinc metal batteries

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Few-layered organic single-crystalline heterojunctions for high-performance phototransistors

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Nano Research 2022年第3期15卷 2667-2673页

作者： Xinzi Tian Jiarong Yao Lijuan Zhang Bin Han Jianwei Shi Jianwei Su Jie Liu Chunlei Li Xinfeng Liu Tianyou Zhai Lang Jiang Fangxu Yang Xiaotao Zhang Ye Zou Rongjin Li Wenping Hu Tianjin Key Laboratory of Molecular Optoelectronic Sciences Department of ChemistrySchool of ScienceTianjin UniversityTianjin 300072China Joint School of National University of Singapore and Tianjin University International Campus of Tianjin UniversityBinhai New CityFuzhou 350207China CAS Key Laboratory of Standardization and Measurement for Nanotechnology CAS Center for Excellence in NanoscienceNational Center for Nanoscience and TechnologyBeijing 100190China State Key Laboratory of Materials Processing and Die&Mould Technology School of Materials Science and EngineeringHuazhong University of Science and Technology(HUST)Wuhan 430074China National Laboratory for Molecular Sciences Key Laboratory of Organic SolidsInstitute of ChemistryChinese Academy of SciencesBeijing 100190China

Photogating and electrical gating are key physical mechanisms in organic phototransistors(OPTs).However,most OPTs are based on thick and polycrystalline films,which leads to substantially low efficiency of both photogating and electrical gating and thus reduced ***,high-performance OPTs based on few-layered organic single-crystalline heterojunctions are proposed and the obstacle of thick and polycrystalline films for photodetection is *** of the molecular scale thickness of the type I organic single-crystalline heterojunctions in OPTs,both photogating and electrical gating are highly *** synergy of efficient photogating and electrical gating,key figures of merit of OPTs reach the highest among those based on planar heterojunctions so far as we *** production of few-layered organic single-crystalline heterojunctions will provide a new type of advanced materials for various applications.

关键词： two-dimensional(2D)molecular crystals organic single crystals organic heterojunctions organic phototransistors

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Crystallographic Orientation and Slip Behavior of Powder Metallurgy Ti-6al-4v Via Multi-Directional Forging

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SSRN 2024年

作者： Qiu, Shangxing Yang, Fang Li, Yang Gou, Wei Wang, Jinfeng Chen, Cunguang Liu, Xinhua Guo, Zhimeng State Key Laboratory for Advanced Metals and Materials China Key Laboratory for Advanced Materials Processing of Ministry of Education China Institute for Advanced Materials and Technology University of Science and Technology Beijing Beijing100083 China Zhuhai519082 China University of Science and Technology Beijing School of Materials Science and Engineering Beijing China Institute of Materials Intelligent Technology Liaoning Academy of Materials Shenyang110167 China

In this study, we present a microstructural and mechanical analysis of Ti-6Al-4V alloys processed by low-temperature multi-directional forging at 900°C, achieving near-theoretical density (99.9%), with a tensile strength of 1070 MPa and elongation of 14.9%. The microstructure is defined by both continuous and discontinuous dynamic recrystallization occurring simultaneously, related to an increase in dislocation density. Significantly, this study reveals the interaction between crystallographic orientation and spheroidization during the forging process. Specifically, changes in crystallographic orientation include the asynchronous formation of new subgrains/grains, the disruption of the Burgers orientation relationship, and rotation around the axis, which not only increases the orientation differences between α lamellae but also enhances the spheroidization process. Moreover, our findings demonstrate that during deformation, the activation of basal and pyramidal slip systems is favored over prismatic slip, suggesting improved slip capabilities. The average misorientation angle and the fraction of high-angle grain boundaries are quantified, providing a detailed characterization of the evolved microstructure. This study adopts a new perspective to examine the microstructural evolution during the multidirectional forging process in powder metallurgy, presenting findings that elucidate how multidirectional forging effectively controls. © 2024, The Authors. All rights reserved.

关键词： Aluminum alloys

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Dual-Aspect Control of Lithium Nucleation and Growth with Hydroxyapatite and Liquid Crystal Polymers for High-Performance Lithium Metal Batteries

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advanced Energy materials 2025年第0期

作者： Miao, Xiang Wu, Zhouhan Hu, Wei Guo, Lin Nan, Ce-Wen School of Chemistry Beijing Advanced Innovation Center for Biomedical Engineering Beihang University Beijing100191 China State Key Laboratory of New Ceramics and Fine Processing School of Materials Science and Engineering Tsinghua University Beijing100084 China Institute for Advanced Materials and Technology University of Science and Technology Beijing Beijing100083 China

Lithium (Li) metal is a promising anode material for next-generation high-energy-density batteries. However, safety concerns and the limited lifespan due to Li dendrite formation hinder its practical application. The complex dendrite formation process involves nonuniform nucleation and radial growth, requiring a holistic strategy to simultaneously regulate both processes. In this work, a dual-aspect control strategy is developed by designing a protective layer composed of hydroxyapatite (HA) and a liquid crystal polymer (LCP). Electrochemical, microstructural, and computational analyses revealed that HA provides homogenous Li0 adsorption sites, enhancing Li nucleation kinetics and uniformity. Meanwhile, the LCP self-assembles into cation-selective channels, promoting Li-ion diffusion and regulating growth direction. This dual-aspect control significantly improved Li plating kinetics and mitigated Li dendrite formation. Benefiting from this strategy, the symmetric cell achieved a critical current density of 5 mA cm−2 and maintained a lifespan of 500 h at 3 mA cm−2. Furthermore, in Li–sulfur batteries, the cell exhibited exceptional high-rate cycling performance (>10 mA cm−2) with an average capacity decay rate of only 0.056% over 1000 cycles. These results highlight the effectiveness of dual-aspect control in suppressing Li dendrites and improving high-rate cycling stability. © 2025 Wiley-VCH GmbH.

关键词： Liquid crystals

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Electrolyte Engineering Toward High-Voltage Aqueous Energy Storage Devices

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Energy & Environmental materials 2021年第3期4卷 302-306页

作者： Jianfeng Tan Jinping Liu School of Chemistry Chemical Engineering and Life Science and State Key Laboratory of Advanced Technology for Materials Synthesis and ProcessingWuhan University of TechnologyWuhan 430070China State Center for International Cooperation on Designer Low-carbon&Environmental Materials and School of Materials Science and Engineering Zhengzhou UniversityZhengzhou 450001China

Aqueous electrochemical energy storage(EES)devices are highly safe,environmentally benign,and inexpensive,but their operating voltage and energy density must be increased if they are to efficiently power multifunctional electronics,new-energy cars as well as to be used in smart *** Minireview summarizes the key breakthroughs and progress in expanding the electrochemical stability window(ESW)of aqueous EES devices over the past five *** briefly introducing the electrode engineering ways to widen ESW,we focus on four ground-breaking electrolyte engineering strategies and classify them into two kinds from the perspective of salts and exotic solutes/*** widening degree toward ESW of these emerging electrolytes is compared and the universal fundamental mechanism relating to the interactions between limited water molecules and high-concentration salts(or large amounts of exotic solutes/solvents)is *** challenges and perspectives for high-ESW electrolytes as well as recent advances in low-cost and other metal ion(sodium,potassium,zinc,etc.)-based electrolytes for expanding ESW are also outlined.

关键词： aqueous energy storage systems electrolyte engineering high voltage high-energy density water electrolysis

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Mesoporous silica stabilized MOF nanoreactor for highly selective semi-hydrogenation of phenylacetylene via synergistic effect of Pd and Ru single site

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Nano Research 2022年第3期15卷 1983-1992页

作者： Zhenxing Li Mingliang Hu Jiahao Liu Weiwei Wang Yanjie Li Wenbin Fan Yixuan Gong Jiasai Yao Ping Wang Miao He Yongle Li State Key Laboratory of Heavy Oil Processing College of New Energy and MaterialsBeijing Key Laboratory of Biogas Upgrading UtilizationChina University of Petroleum(Beijing)Beijing 102249China Department of Physics International Center of Quantum and Molecular Structuresand Shanghai Key Laboratory of High Temperature SuperconductorsShanghai UniversityShanghai 200444China Division of Chemistry and Chemical Engineering California Institute of Technology1200 California Blvd.PasadenaCalifornia 91125USA

Selective semi-hydrogenation of phenylacetylene to styrene is a crucial step in the polystyrene *** Pd-based catalysts are widely used in this reaction due to their excellent hydrogenation activity,the selectivity for styrene remains a great ***,we designed a mesoporous silica stabilized Pd-Ru@ZIF-8(MS Pd-Ru@ZIF-8)nanoreactor with novel Pd and Ru single site synergistic catalytical system for semi-hydrogenation of *** nanoreactor exhibited a superior performance,achieving 98%conversion of phenylacetylene and 96%selectivity to *** frequency(TOF)of nanoreactor was up to as high as 2,188 h^(−1),which was 25 times and 5 times more than the single metal species catalysts,mesoporous silica stabilized Pd@ZIF-8 nanoreactor(MS Pd@ZIF-8),and mesoporous silica stabilized Ru@ZIF-8 nanoreactor(MS Ru@ZIF-8).This catalytic activity was attributed to the synergistic effect of Pd and Ru single site anchored strongly into the framework of ZIF-8,which reduced the desorption energy of styrene and increased the hydrogenation energy barrier of ***,since the ordered mesoporous silica was introduced into the nanoreactor shell to stabilize ZIF-8,MS Pd-Ru@ZIF-8 showed excellent reusability and *** the five cycles,the catalytical activity and selectivity still *** work provides insights for a synergistic catalytic system based on single-site active sites for selective hydrogenation reactions.

关键词： mesoporous silica metal–organic frameworks(MOF) semi-hydrogenation of phenylacetylene synergistic effect single site

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