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High-performance ultraviolet-visible photodetector with high sensitivity and fast response speed based on MoS_(2)-on-ZnO photogating heterojunction

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Tungsten 2023年第1期5卷 91-99页

作者： Xing-Lai Zhang Jing Li Bing Leng Liu Yang Yan-Dong Song Si-Yu Feng Li-Zhi Feng Zi-Tong Liu Zheng-Wei Fu Xin Jiang Bao-Dan Liu Shenyang National Laboratory for Materials Science Institute of Metal ResearchChinese Academy of SciencesNo.72 Wenhua RoadShenyang 110016China School of Material Science and Engineering Northeastern UniversityNo.11 Wenhua RoadShenyang 110819China Foshan Graduate School of Northeastern University No.2 Zhihui RoadFoshan 528300China Department of Plastic Surgery The First Affiliated Hospital of China Medical UniversityNo.155 North Nanjing StreetShenyang 110001China School of Materials Science and Engineering University of Science and Technology of ChinaNo.72 Wenhua RoadShenyang 110016China

Photogating is an effective strategy to modulate the channel conductance of the device with light-induced gate field or voltage,thereby improving the performance of optoelectronic devices.In this work,to overcome the long response time and low photoresponse of one-dimensional ZnO,a MoS_(2)-on-ZnO photogating vertical heterojunction photodetector is design and constructed.Herein,the ZnO nanowire with high carrier mobility can response ultraviolet light and supply a highspeed carrier transport channel,while the MoS_(2) flake as a photogating layer can response with visible light and transfer photogenerated electrons into the ZnO nanowire to adjust its conductivity.Thus,the irradiation of visible light is equivalent to applying a photo-induced gate voltage on the ZnO nanowire.In addition,the photogenerated electrons will not transmit through the MoS_(2) with low carrier mobility,so that not only the visible light response of the photodetector can be realized,but also its ultraviolet light response is able to be improved.Under ultraviolet light irradiation,the photoresponsivity of the photodetector can be reached to 273 A W-1and the response speed is less than 24 ms.More important,based on this unique heterojunction structure,MoS_(2)-on-ZnO photodetector also illustrates an excellent visible light response with a high photoresponsivity(74 A W-1) and fast response speed(<24 ms) due to the photogating effect.This work not only paves the way to design high-performance photodetectors with high photoresponsivity and fast response speed,but also provide a promising approach to improve the performance of optoelectronic devices using photogating effect.

关键词： MoS_(2) ZnO two-dimension Photogating Photodetectors

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dimensionally confined nanosheets self-assembled through self-shielding multiple hydrogen bonding interactions in aqueous media

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Chinese Chemical Letters 2022年第11期33卷 4856-4859页

作者： Jing Zhang Shuaiwei Qi Hao Yu Ze Lin Bao Li Ming Wang Zeyuan Dong State Key Laboratory of Supramolecular Structure and Materials College of ChemistryJilin UniversityChangchun 130012China

Herein,we adopt a simple supramolecular strategy to effectively control the tautomerism of ureidopyrimidinone(UPy)moiety and ultimately realize the complete arrangement of enol configuration.The obtained UPy derivatives containing self-complementary quadruple hydrogen bonding interactions can spontaneously self-assemble towards the formation of well-controlled,self-organized supramolecular nanostructure morphologies in both chloroform and water.The resulting aggregates had been fully characterized by various spectroscopy(absorption,emission)and microscopy(TEM,SEM and AFM)studies.It is anticipated that this study can provide an exact and excellent monomeric unit for controllable and precise supramolecular polymerization.The results achieved here also demonstrate the utility and feasibility of multiple hydrogen bonds to direct the self-assembly of small-molecule building blocks in aqueous media,which provides a strategy for the construction of well-defined and stable supramolecular architectures with chemical functionalities and physical properties as advanced materials for biological applications.

关键词： Hydrogen bonding Aqueous media Sandwich structure Self-shielding two-dimension

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Advances and Challenges in two‑dimensional Organic–Inorganic Hybrid Perovskites Toward High‑Performance Light‑Emitting Diodes

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Nano-Micro Letters 2021年第11期13卷 32-67页

作者： Miao Ren Sheng Cao Jialong Zhao Bingsuo Zou Ruosheng Zeng School of Physical Science and Technology MOE Key Laboratory of New Processing Technology for Non‑Ferrous Metals and MaterialsGuangxi Key Laboratory of Processing for Non‑Ferrous Metals and Featured MaterialsGuangxi UniversityNanning 530004People’s Republic of China

two-dimensional(2D)perovskites are known as one of the most promising luminescent materials due to their structural diversity and outstanding optoelectronic properties.Compared with 3D perovskites,2D perovskites have natural quantum well structures,large exciton binding energy(Eb)and outstanding thermal stability,which shows great potential in the next-generation displays and solidstate lighting.In this review,the fundamental structure,photophysical and electrical properties of 2D perovskite films were illustrated systematically.Based on the advantages of 2D perovskites,such as special energy funnel process,ultrafast energy transfer,dense film and low efficiency roll-off,the remarkable achievements of 2D perovskite light-emitting diodes(PeLEDs)are summarized,and exciting challenges of 2D perovskite are also discussed.An outlook on further improving the efficiency of pure-blue PeLEDs,enhancing the operational stability of PeLEDs and reducing the toxicity to push this field forward was also provided.This review provides an overview of the recent developments of 2D perovskite materials and LED applications,and outlining challenges for achieving the high-performance devices.

关键词： two-dimension Perovskite Light-emitting diodes Optical properties

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Spatially-controlled porous nanoflake arrays derived from MOFs:An efficiently long-life oxygen electrode

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Nano Research 2019年第10期12卷 2528-2534页

作者： Hao Gong Tao Wang Hairong Xue Xueyi Lu Wei Xia Li Song Songtao Zhang Jianping HeRenzhi Ma College of Materials Science and Technology^Jiangsu Key Laboratory of Materials and Technology for Energy Conversion Nanjing University(rf Aeronautics and AstronauticsNanjing 210016China International Center for Materials Nanoarchitectonics(WPI-MANA) National Institute for Materials Science(NIMS)1-1 NatnikiTsukubaIbaraki 305-0044Japan School of Chemistry and Chemical Engineering South China University of TechnologyWushan Road 381Guangzhou 510641China Testing Center Yangzhou UniversityYangzhou 225009China

The urge nt expectati on of the n ext-ge neratio n en ergy storage devices for electric vehicles has drive n researchers'atte ntion to the lithium-oxyge n(Li-O2)batteries due to the satisfied specific energy density.Herein,spatially-controlled CO3O4 nanoflake arrays with three-dimensional networked morphology are adopted as flexible and self-sta nding oxyge n cathodes in L1-O2 batteries.The spin el-phase CO3O4 nano flakes were con verted from two dimensi on metal-orga nic frameworks with abundant available cha nnels and large specific surface area.The open-structure nano flake arrays possess sufficie nt Li2O2/cathode contact interface,great bifunctional catalytic performa nee and adequate Li2O2 accommodation,leading to the enhanced electrochemical performance of the L1-O2 batteries.As expected,the binder-free porous CO3O4/CT cathode delivers a high capacity of 6,509 mAh·g^-1(200 mA·g^-1)and enhanced stability over 100 cycles(limited by 1,000 mAh·g^-1).In additi on,pouch-type Li-O2 batteries were successfully desig ned and cycled with CO3O4/CT cathode as oxyge n electrodes,dem on strating its potential application for flexible electronics and wearable energy storage devices.

关键词： two-dimension metal-organic frameworks mesoporous CO3O4 flexible oxygen electrode lithium-oxygen batteries

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Shape/size controlling syntheses, properties and applications of two-dimensional noble metal nanocrystals

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Frontiers of Chemical Science and Engineering 2016年第3期10卷 360-382页

作者： Baozhen An Mingjie Li Jialin Wang Chaoxu Li Bioengineering Department College of Chemical Engineering Qingdao University of Science & Technology Qingdao 266042 China CAS Key Laboratory of Bio-based Materials Qingdao Institute of Bioenergy and Bioprocess Technology Chinese Academy of Sciences Qingdao 266101 China

two dimensional （2D） nanocrystals of noble metals （e.g., Au, Ag, Pt） often have unique structural and environmental properties which make them useful for applications in electronics, optics, sensors and biomedi- cines. In recent years, there has been a focus on discovering the fundamental mechanisms which govern the synthesis of the diverse geometries of these 2D metal nanocrystals （e.g., shapes, thickness, and lateral sizes）. This has resulted in being able to better control the properties of these 2D structures for specific applications. In this review, a brief historical survey of the intrinsic anisotropic properties and quantum size effects of 2D noble metal nanocrystals is given and then a summary of synthetic approaches to control their shapes and sizes is presented. The unique properties and fascinating applica- tions of these nanocrystals are also discussed.

关键词： two-dimension noble metal nanocrystal surface plasmon controllable synthesis

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A 2D NiFe Bimetallic Metal–Organic Frameworks for Efficient Oxygen Evolution Electrocatalysis

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Energy & Environmental Materials 2019年第1期2卷 18-21页

作者： Yongchao Hao Qinglin Liu Ying Zhou Zeqian Yuan Yanan Fan Zhuofeng Ke Cheng-Yong Su Guangqin Li MOE Laboratory of Bioinorganic and Synthetic Chemistry Lehn Institute of Functional MaterialsSchool of ChemistrySun Yat-Sen UniversityNo.135Xingang Xi RoadGuangzhou 510275China Key Laboratory for Polymeric Composite and Functional Materials of Ministry of Education School of Materials Science and EngineeringSun Yat-Sen UniversityGuangzhou 510275China

The oxygen evolution reaction(OER) is the cornerstone for many important energy conversion devices, including metal–air battery and water splitting.Herein, an optimized NiFe-based metal–organic framework is developed as highly efficient active material for OER. It just needs a low overpotential of 0.31 V to deliver a current density of 10 mA cm-2 with a favorable Tafel slope of 43.7 mV dec-1 in 0.1 M KOH electrolyte for the as-prepared Ni0.75Fe0.25 BDC, which is superior to RuO2. This efficient catalytic performance is due to the introduction of Fe in Ni-based MOFs could benefit the kinetics and charge transfer efficiency, resulting in the optimal activity toward OER. Besides, the obtained active material demonstrates good stability, suggesting the great potential value in sustainable electrochemical energy storage and conversion devices.

关键词： iron-doping metal-organic frameworks oxygen evolution reaction two-dimension

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two-dimensional Euler Adaptive Mesh Method on Detonation

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Journal of Beijing Institute of Technology 2009年第2期18卷 141-145页

作者：郝鹏程冯其京姚雯 Beijing Institute of Applied Physics and Computational Mathematics

The adaptive mesh refinement （AMR） method is applied in the 2-D Euler multi-component elasticplastic hydrodynamics code （MEPH2Y）. It is applied on detonation. Firstly, the AMR method is described, including a conservative spatial interpolation, the time integration methodology with the adapitve time increment and an adaptive computational region method. The advantage of AMR technique is exhibited by numerical examples, including the 1-D C-J detonation and the 2-D implosion ignited from a single point. Results show that AMR can promote the computational efficiency, keeping the accuracy in interesting regions.

关键词： adaptive mesh refinement （AMR） detonation two-dimension Euler numerical simulation

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Electrical contacts to two-dimensional transition-metal dichalcogenides

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Journal of Semiconductors 2018年第12期39卷 60-67页

作者： Shuxian Wanga Zhihao Yu Xinran Wang Kansas Academy of Mathematics and Science Fort Hays State University600ark StreetHaysKansas 67601-4099USA National Laboratory of Solid State Microstructures School of Electronic Science and Engineeringand Collaborate Innovation Center of Advanced MicrostructuresNanjing UniversityNanjing 210093China

two-dimensional(2D) transition-metal dichalcogenides(TMDCs) have attracted enormous interests as the novel channel materials for atomically thin transistors. Despite considerable progress in recent years, the transistor performance is largely limited by the excessive contact resistance at the source/drain interface. In this review, a summary of recent progress on improving electrical contact to TMDC transistors is presented. Several important strategies including topology of contacts, choice of metals and interface engineering are discussed.

关键词： two-dimension channel materials Fin-FET

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The Synthesis and Structural Characterization of two-dimensional Coordination Polymer {[Ni(phen)H_2O](μ_4-C_( 10)H_2O_8)_(1/2)}_n

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Chemical Research in Chinese Universities 2002年第4期18卷 474-477页

作者： YE Ling PAN Cheng-ling CHU De-qing WANG Li-min MU Zhong-cheng XU Ji-qing Key Laboratory for Supramolecular Structure and Materials of Ministry of Education Jilin UniversityChangchun 130023P.R.China College of Chemistry Jilin UniversityChangchun 130023P.R.China Department of Chemistry Northeast Normal UniversityChangchun 130024P.R.China

The successful preparation of coordination polymers from modular precursors has provided a facile approach to develope solids and functional materials［1］.

关键词： two-dimension Hydrothermal synthesis Inorganic-organic hybrid material Crystal structure

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超薄切片与剥离制备单层单晶二维量子点

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Science China Materials 2020年第6期63卷 1046-1053页

作者：郝阳宿雯侯凌翔崔雪萍王少芝占鹏鑫邹业范楼珍郑健 Key Laboratory of Organic Solids Institute of ChemistryChinese Academy of SciencesBeijing 100190China University of the Chinese Academy of Sciences Beijing 100049China College of Chemistry Beijing Normal UniversityBeijing 100875Chind

二维(2D)原子级薄量子点(QDs)具有非凡的电学和光学性能.但是用于制备高质量2D量子点的通用、可靠技术仍然面临挑战.本文中,我们报道了一种简单的用超薄切片机垂直切割2D块体单晶,然后通过剥离来制备高质量单层单晶2D量子点的方法.所制... 详细信息

二维(2D)原子级薄量子点(QDs)具有非凡的电学和光学性能.但是用于制备高质量2D量子点的通用、可靠技术仍然面临挑战.本文中,我们报道了一种简单的用超薄切片机垂直切割2D块体单晶,然后通过剥离来制备高质量单层单晶2D量子点的方法.所制备的2D量子点具有原始表面、高质量、高单层产率和高光致发光量子产率(WS2具有最高的光致发光量子产率18%).所制备的单层单晶二维量子点可作为一种有前途的低毒、生物相容性好、具有良好细胞通透性的荧光标记试剂.

关键词： two-dimension single crystal quantum dots ultrathin cutting photoluminescence quantum yield

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