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Two-dimensional PtPb-PbS heterostructure enables improved kinetics and highlighted bifunctional antipoisoning for methanol electrooxidation

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Science China Chemistry 2022年第6期65卷 1112-1121页

作者： Liangbin Liu Chongyang Tang Lingzheng Bu xiangheng xiao xiaoqing Huang State Key Laboratory of Physical Chemistry of Solid Surfaces College of Chemistry and Chemical EngineeringXiamen UniversityXiamen361005China School of Physics and Technology Wuhan UniversityWuhan430072China

Two-dimensional(2 D) platinum(Pt)-based nanomaterials are considered as the ideal fuel cell catalysts, while their rational synthesis associated with phase control remains a formidable challenge. Herein, we firstly design the novel 2 D Pt-lead-sulphur heterophased nanosheets(Pt Pb S HPNSs) as efficient high-toleration electrocatalysts for methanol oxidation reaction(MOR).They exhibit much higher activity and more highlighted bifunctional antipoisoning abilities than Pt Pb NSs and commercial Pt/*** density functional theory(DFT) simulation verifies that the decreased electron density of Pt sites worked by Pb and S makes CO intermediate favorable to desorb, avoiding the formation of CO*-polluted Pt sites. Simultaneously, this heterophased interface effectively weakens the adsorption of S^(2-)-species and improves the S-poisoning tolerance, showing a route to realize nearly innoxious catalysis. The present work highlights the importance of heterophase control in tuning antipoisoning property for 2 D Pt-based nanomaterials, which is key for the rational design of efficient fuel cell anodic catalysts.

关键词： two-dimensional platinum heterophase control methanol oxidation reaction poisoning tolerance

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Structure and Growth Mechanism of V/Ag Multilayers with Different Periodic Thickness Fabricated by Magnetron Sputtering Deposition

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Journal of Materials Science & Technology 2014年第10期30卷 1012-1019页

作者： Hongxiu Zhang Feng Ren Mengqing Hong xiangheng xiao Guangxu Cai Changzhong Jiang School of Physics and Technology Center for Ion Beam Applicationand Center for Electron MicroscopyWuhan University

V/Ag multilayers with different periodic thicknesses were fabricated by magnetron sputtering deposition. The columnar structure and the orientation relationship of the multilayers were investigated by transmission electron microscopy, high resolution transmission electron microscopy, selected-area electron diffraction and X-ray diffraction. It was found that the multilayered structure became flatter as increasing individual layer thickness from 2 to 6 nm, and then became waved as the individual layer thickness increases to 8 nm. At the beginning of the growth, the morphology of the multilayers with small periodic thickness was influenced mainly by thermodynamic instabilities, and the morphology of the multilayers with larger periodic thickness was mainly influenced mainly by the columnar growth of V. When the waved interfaces were formed, the continuum growth of the multilayers was also influenced by the shadowing effect and the finite atomic size effect. All of these factors resulted in the columnar structure of the multilayers. Multilayers with small periodic thickness presented strong orientation relationship. Nano-hardness tests indicated that multilayers with flat sublayer morphology and clear interfaces exhibited larger hardness.

关键词： Multilayers Interfaces Columnar structure Transmission electron microscopy

Recent progress about 2D metal dichalcogenides: Synthesis and application in photodetectors

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Nano Research 2021年第6期14卷 1819-1839页

作者： Yongfeng Pei Rui Chen Hang Xu Dong He Changzhong Jiang Wenqing Li xiangheng xiao Department of Physics and Key Laboratory of Artificial Micro-and Nano-structures of Ministry of Education Hubei Nuclear Solid Physics Key LaboratoryWuhan UniversityWuhan430072China

In recent years, two-dimensional (2D) layered metal dichalcogenides (MDCs) have received enormous attention on account of their excellent optoelectronic properties. Especially, various MDCs can be constructed into vertical/lateral heterostructures with many novel optical and electrical properties, exhibiting great potential for the application in photodetectors. Therefore, the batch production of 2D MDCs and their heterostructures is crucial for the practical application. Recently, the vapour phase methods have been proved to be dependable for growing large-scale MDCs and related heterostructures with high quality. In this paper, we summarize the latest progress about the synthesis of 2D MDCs and their heterostructures by vapour phase methods. Particular focus is paid to the control of influence factors during the vapour phase growth process. Furthermore, the application of MDCs and their heterostructures in photodetectors with outstanding performance is also outlined. Finally, the challenges and prospects for the future application are presented.

关键词： metal dichalcogenides vertical/lateral heterostructures vapour phase methods photodetectors

Influence of Annealing Temperature on the Properties of TiO_2 Films Annealed by ex situ and in situ TEM

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Journal of Wuhan University of Technology(Materials Science) 2012年第6期27卷 1014-1019页

作者：彭堂超 xiao xiangheng REN Feng XU Jinxia ZHOU xiaodong MEI Fei 蒋昌忠 School of Physics and Technology Wuhan University Huazhong Institute of Electro-Optics-Wuhan National Laboratory for Optoelectronics School of Electrical&Electronic Engineer Hubei University of TechnologyWuhan 430068China

TiO2 thin films were deposited on quartz substrates by DC reactive magnetron sputtering of a pure Ti target in Ar/O2 plasma at room temperature. The TiO2 films were annealed at different temperatures ranging from 300 to 800 ℃ in a tube furnace under flowing oxygen gas for half an hour each. The effect of annealing temperatures on the structure, optical properties, and morphologies were presented and discussed by using X-ray diffraction, optical absorption spectrura, and atomic force microscope. The films show the presence of diffraction peaks from the （101）, （004）, （200） and （105） lattice planes of the anatase TiO2 lattice. The direct band gap of the annealed films decreases with the increase of annealing temperature. While, the roughness of the films increases with the increases of annealing temperature, and some significant roughness changes of the TiO2 film surfaces were observed after the annealing temperature reached 800 ℃. Moreover, the influences of annealing on the microstructures of the TiO2 film were investigated also by in situ observation in transmission electron microscope.

关键词： TiO2 films DC reactive magnetron sputtering anatase in situ TEM annealing

Recent progress in the fabrication of SERS substrates based on the arrays of polystyrene nanospheres

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Science China(Physics,Mechanics & Astronomy) 2016年第12期59卷 1-11页

作者： xiaoLei Zhang ZhiGao Dai XinGang Zhang ShiLian Dong Wei Wu ShiKuan Yang xiangheng xiao ChangZhong Jiang Department of Physics and Key Laboratory of Artificial Micro-and Nano-structures of Ministry of Education Hubei Nuclear Solid Physics Key Laboratory and Center for Ion Beam ApplicationWuhan UniversityWuhan 430072China School of Printing and Packaging Wuhan UniversityWuhan 430072China School of Materials Science and Engineering Zhejiang UniversityHangzhou 310027China Su Zhou Institue of Wuhan University Suzhou 215123China

Micro/nanostructures have broad applications in diverse application fields, such as surface enhanced Raman spectroscopy (SERS), photocatalysis, field emission, photonic crystals, microfluidic devices, electrochemical devices, etc. Using polystyrene (PS) spheres formed monolayer colloidal crystal templates as masks, scaffolds, or molds with different materials growth techniques, many different periodic nanostructured arrays can be obtained with the building units varied from nanoparticles, nanopores, nanorings, nanorods, to nanoshells. Significant progresses have been made on the synthesis of micro/nanostructures with efficient SERS response. In this review, we mainly focus on the various PS template-based fabrication techniques in realizing micro/nanostructured arrays and the SERS applications.

关键词： micro/nanostructures polystyrene nanosphercs SERS

Flexible cation-based threshold selector for resistive switching memory integration

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Science China(Information Sciences) 2018年第6期61卷 50-57页

作者： xiaolong ZHAO Rui WANG xiangheng xiao Congyan LU Facai WU Rongrong CAO Changzhong JIANG Qi LIU Department of Physics Hubei Nuclear Solid Physics Key Laboratory and Center for Ion beam ApplicationWuhan University Key Laboratory of Microelectronic Devices & Integrated Technology Institute of MicroelectronicsChinese Academy of Sciences University of Chinese Academy of Sciences

Emerging resistive switching random access memory（RRAM）, considered as the most promising candidate of flash memory, is favorable for in flexible electronic system. However, in high density flexible crossbar RRAM array, crosstalk issue that currents from the neighboring unselected cell lead to failure of write and read operations, still keeps a main bottleneck. Therefore, flexible selector compatible with the flexibility of the RRAM array should be focused on to configure one selector-one resistor（1 S1 R） system,which is immune to crosstalk issue. In this paper, flexible cation-based threshold switching（TS） selectors（Pt/Ag/Hf O;/Pt/Ti/parylene） are fabricated and the compressive performance is studied *** device shows excellent bidirectional volatile TS characteristics, including high selectivity ratio（10;）, low operating voltages（|VTH|<1 V）, ultra-low leakage current(～10;A) and good flexibility. The successful demonstration of the wire connected 1 S1 R unit comprising this flexible selector and one bipolar resistor cell indicates the great potential of this cation-based selector to restrain the crosstalk issue in a large flexible RRAM array.

关键词： cation-based threshold switching resistive switching flexible selector conductive filament(CF) 1S1R

Spatially selective p-type doping for constructing lateral WS_(2) p-n homojunction via low-energy nitrogen ion implantation

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Light(Science & Applications) 2024年第6期13卷 1159-1169页

作者： Yufan Kang Yongfeng Pei Dong He Hang Xu Mingjun Ma Jialu Yan Changzhong Jiang Wenqing Li xiangheng xiao School of Physics and Technology Key Lab of Artificial Micro-and Nano-Structures of Ministry of EducationWuhan UniversityWuhanChina

The construction of lateral p-n junctions is very important and challenging in two-dimensional(2D)semiconductor manufacturing *** researches have demonstrated that vertical p-n junction can be prepared simply by vertical stacking of 2D ***,interface pollution and large area scalability are challenges that are difficult to overcome with vertical stacking *** 2D lateral p-n homojunction is an effective strategy to address these *** selective p-type doping of 2D semiconductors is expected to construct lateral p-n *** this work,we have developed a low-energy ion implantation system that reduces the implanted energy to 300 ***-energy implantation can form a shallow implantation depth,which is more suitable for modulating the electrical and optical properties of 2D ***,we utilize low-energy ion implantation to directly dope nitrogen ions into few-layer WS_(2) and successfully realize a precise regulation for WS_(2) with its conductivity type transforming from n-type to bipolar or even p-type ***,the universality of this method is demonstrated by extending it to other 2D semiconductors,including WSe_(2),SnS_(2) and MoS_(2).Based on this method,a lateral WS_(2) p-n homojunction is fabricated,which exhibits significant rectification characteristics.A photodetector based on p-n junction with photovoltaic effect is also prepared,and the open circuit voltage can reach to 0.39 *** work provides an effective way for controllable doping of 2D semiconductors.

关键词： implantation doping Spatial

In-situ structural evolution of Bi_(2)O_(3) nanoparticle catalysts for CO_(2) electroreduction

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International Journal of Extreme Manufacturing 2022年第3期4卷 113-120页

作者： Hongbo Wang Chongyang Tang Bo Sun Jiangchao Liu Yan Xia Wenqing Li Changzhong Jiang Dong He xiangheng xiao Department of Physics Hubei Nuclear Solid Physics Key LaboratoryWuhan UniversityWuhan 430072People’s Republic of China Hubei Yangtze Memory Laboratories Wuhan 430205People’s Republic of China

Under the complex external reaction conditions,uncovering the true structural evolution of the catalyst is of profound significance for the establishment of relevant structure–activity relationships and the rational design of ***,the surface reconstruction of the catalyst was characterized by ex-situ methods and in-situ Raman spectroscopy in CO_(2)*** final results showed that the Bi_(2)O_(3) nanoparticles were transformed into Bi/Bi_(2)O_(3) two-dimensional thin-layer nanosheets(NSs).It is considered to be the active phase in the electrocatalytic *** Bi/Bi_(2)O_(3) NSs showed good catalytic performance with a Faraday efficiency(FE)of 94.8%for formate and a current density of 26 mA cm^(−2) at−1.01 *** the catalyst maintained a 90%FE in a wide potential range(−0.91 V to−1.21 V)and long-term stability(24 h).Theoretical calculations support the theory that the excellent performance originates from the enhanced bonding state of surface Bi-Bi,which stabilized the adsorption of the key intermediate OCHO^(∗) and thus promoted the production of formate.

关键词： CO_(2)electroreduction structural evolution electrocatalysis interface formic acid

The d-orbital coupling modulation of CuNi alloy for acetonitrile electrochemical reduction and in-situ hydrogenation behavior characterization

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Science China Chemistry 2023年第11期66卷 3242-3251页

作者： Boling Liu Dong He Zunjian Ke Hongbo Wang Chongyang Tang Qi Zhang Hang Xu Menghua Yang Yafei Yang Qi Liu xiangheng xiao School of Physics and Technology Wuhan UniversityWuhan 430072China Wuhan Research Center for Infectious Diseases and Cancer Chinese Academy of Medical SciencesWuhan 430072China Department of Physics City University of Hong KongHong Kong 999077China

Electrochemical reduction of acetonitrile to ethylamine with a high selectivity is a novel approach to manufacture valuable primary amines which are important raw material in organic chemical industry. However, the poor ethylamine Faradic efficiency(FE_(ethylamine)) and catalyst stability at the high current density prohibit this method from being practically used. Herein, CuNi alloy ultrafine-nano-particles based on the d-orbital coupling modulation were synthesized through the electrodeposition and their catalytic performance towards acetonitrile reduction reaction(ACNRR) has been systematically studied. The highest FE_(ethylamine)(97%) is achieved with the current density of-114 mA cm^(-2). For practical application, the current density can reach-602.8 mA cm^(-2) with 82.8% FE_(ethylamine)maintained. With the appearance of other organics which co-exist with acetonitrile in the SOHIO process, CuNi can also hydrogenate acetonitrile in it with more than 80% FE_(ethylamine). Our in-situ spectroscopy analysis and DFT calculations towards the acetonitrile hydrogenation behavior reveal that the evenly dispersed Ni in Cu modulates the dband so as to endow CuNi with the better acetonitrile adsorption, milder binding energy with the reaction intermediates, smaller barrier for *CH_3CH_2NH_2 desorption and higher ability for H_2O dissociation to provide *H.

关键词： CuNi alloy acetonitrile reduction reaction d-orbital coupling modulation in-situ spectroscopy analysis acetonitrile adsorption

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