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Chemical/Light‐Powered Hybrid Micromotors with “On‐the‐Fly” Optical Brakes

Angewandte Chemie 2018年第27期130卷

作者： Chuanrui Chen Songsong Tang Hazhir Teymourian Emil Karshalev Fangyu Zhang Jinxing Li Fangzhi Mou Yuyan Liang Jianguo Guan Joseph Wang Department of Nanoengineering University of California San Diego La Jolla CA 92093 USA State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 P. R. China

Hybrid micromotors capable of both chemically powered propulsion and fuel‐free light‐driven actuation and offering built‐in optical brakes for chemical propulsion are described. The new hybrid micromotors are designed by combining photocatalytic TiO 2 and catalytic Pt surfaces into a Janus microparticle. The chemical reactions on the different surfaces of the Janus particle hybrid micromotor can be tailored by using chemical or light stimuli that generate counteracting propulsion forces on the catalytic Pt and photocatalytic TiO 2 sides. Such modulation of the surface chemistry on a single micromotor leads to switchable propulsion modes and reversal of the direction of motion that reflect the tuning of the local ion concentration and hence the dominant propulsion force. An intermediate Au layer (under the Pt surface) plays an important role in determining the propulsion mechanism and operation of the hybrid motor. The built‐in optical braking system allows “on‐the‐fly” control of the chemical propulsion through a photocatalytic reaction on the TiO 2 side to counterbalance the chemical propulsion force generated on the Pt side. The adaptive dual operation of these chemical/light hybrid micromotors, associated with such control of the surface chemistry, holds considerable promise for designing smart nanomachines that autonomously reconfigure their propulsion mode for various on‐demand operations.

关键词： Chemischer Antrieb Janus-Mikromotoren Optische Bremsen Photokatalytische Reaktionen

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Effects of Annealing Processes on CuxSi(1-x) Thin Films

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Journal of Wuhan University of technology(materials Science) 2016年第1期31卷 31-34页

作者：章嵩 WU Jun HE Zhiqiang 涂溶 SHI Ji ZHANG Lianmeng State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070China Department of Metallurgy and Ceramics Science Tokyo Institute of Technology Tokyo 152-8552 Japan Institute for Materials Research Tohoku University Sendal 980-8577 Japan

The CuxSi（1-x） thin films have been grown by pulsed laser deposition（PLD） with in situ annealing on Si（001） and Si（111）,*** transformation of phase was detected by X-ray diffraction（XRD）.The results showed that the as-deposited films were composed of Cu on both Si（001） and Si（111）.The annealed thin films consisted of Cu ＋η ＂-Cu3Si on Si（001） while Cu ＋η＇-Cu3Si on Si（111）,respectively,at annealed temperature（Ta）= 300-600℃.With the further increasing of Ta,at Ta= 700℃,there was only one main phase,η＂-Cu3Si on Si（001） while η＇-Cu3Si on Si（111）,*** annealed thin films transformed from continuous dense structure to scattered-grain morphology with increasing Ta detected by field emission scanning electron microscope（FESEM）.It was also showed that the grain size would enlarge with increasing annealing time（ta）.

关键词： CuxSi1-x thin films PLD phase surface morphology

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Hierarchically Dual-Mesoporous TiO2 Microspheres for Enhanced Photocatalytic Properties and Lithium Storage

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Chemistry (Weinheim an der Bergstrasse, Germany) 2018年第50期24卷 13246-13252页

作者： Sa Xiao Yi Lu Xin Li Bing-Yu Xiao Liang Wu Jian-Ping Song Yu-Xuan Xiao Si-Ming Wu Jie Hu Yong Wang Gang-Gang Chang Ge Tian Silvia Lenaerts Christoph Janiak Xiao-Yu Yang Bao-Lian Su State Key Laboratory Advanced Technology for Materials Synthesis and Processing and School of Materials Science & Engineering Wuhan University of Technology 122 Luoshi Road 430070 Wuhan China. School of Chemistry Chemical Engineering and Life Science Wuhan University of Technology 122 Luoshi Road 430070 Wuhan China. Research Group of Sustainable Energy and Air Purification (DuEL) Department of Bioscience Engineering University of Antwerp Antwerp Belgium. Institut für Anorganische Chemie und Strukturchemie Heinrich-Heine-Universität Düsseldorf 40204 Düsseldorf Germany. School of Engineering and Applied Sciences Harvard University Cambridge Massachusetts 02138 USA. Laboratory of Inorganic Materials Chemistry (CMI) University of Namur 61 rue de Bruxelles 5000 Namur Belgium.

Hierarchically dual-mesoporous TiO microspheres have been synthesized by a solvothermal process in the presence of 1-butyl-3-methylimidazolium tetrafluoroborate ([BMIm][BF ]) and diethylenetriamine (DETA) as co-templates. Secondary mesostructured defects in the hierarchical TiO microspheres produce oxygen vacancies, which not only significantly enhance photocatalytic activity in the degradation of methylene blue (1.7 times that with P25) and acetone (2.9 times that with P25), but are also beneficial for lithium storage. Moreover, we propose a mechanism to rationalize the role of this dual mesoporosity of the TiO microspheres in enhancing molecular diffusion, ion transportation, and electronic transitions.

关键词： energy storage hierarchical dual-mesoporous TiO2 ionic liquids mesostructured defects photocatalysis template synthesis

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Perovskite Quantum Dots: Ultrathin, Core–Shell Structured SiO2Coated Mn2+-Doped Perovskite Quantum Dots for Bright White Light-Emitting Diodes (Small 19/2019)

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Small 2019年第19期15卷

作者： Xiaosheng Tang Weiwei Chen Zhengzheng Liu Juan Du Zhiqiang Yao Yi Huang Cheng Chen Zhaoqi Yang Tongchao Shi Wei Hu Zhigang Zang Yu Chen Yuxin Leng Key Laboratory of Optoelectronic Technology & Systems (Ministry of Education) College of Optoeletronic Engineering Chongqing University Chongqing 400044 China State Key Laboratory of High Field Laser Physics Shanghai Institute of Optics and Fine Mechanics Chinese Academy of Sciences Shanghai 201800 China State Centre for International Cooperation on Designer Low-Carbon and Environmental Materials (ICDLCEM) School of Materials Science and Engineering Zhengzhou University Zhengzhou 450001 China College of Optoeletronic Engineering Chongqing University of Posts and Telecommunications Chongqing 400065 P. R. China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing School of Materials Science and Engineering Wuhan University of Technology Wuhan 430070 China School of Pharmaceutical Sciences Jiangnan University Jiangsu 214122 China School of Optoelectronic Science and Engineering & Collaborative Innovation Center of Suzhou Nano Science and Technology Soochow University Suzhou 215006 China

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Electrochemical Behavior of Magnolol on FeWO4 Nanoflower Modified Carbon Paste Electrode

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Journal of Wuhan University of technology(materials Science) 2016年第4期31卷 722-726页

作者：胡卫兵 ZHANG Wen SONG Nannan QU Wanyun HU Sheng Key Laboratory of Biological Resources Protection and Utilization of Hubei Province Hubei University for Nationalities. Enshi 445000 China School of Chemical and Environmental Engineering Hubei University for Nationalities Enshi 445000 China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 China

In order to establish a simple,sensitive,and fast reliable detection method to determine the magnolol,FeWO4 nanoflower was synthesised through a solvothermal technique and FeWO4 nanoflower modified carbon paste electrode（CPE） was *** voltammetric behavior of magnolol on the modified electrodes was studied using cyclic voltammetry（CV）,linear sweep voltammetry（LSV）,and differential pulse voltammetry（DPV）.The experimental results showed that the modified electrode remarkably enhanced the electrochemical response of the magnolol and exhibited a wide linear range for determination of the magnolol from 1.0×10-7 to 1.0×10-4 mol/L with a low detection limit of 5.0×10-8 mol/L.

关键词： voltammetry Paste paste remarkably Modified graphite paraffin anodic electrolyte silica

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Acid-activated and WO_x-loaded montmorillonite catalysts and their catalytic behaviors in glycerol dehydration

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Chinese Journal of Catalysis 2017年第6期38卷 1087-1100页

作者： Weihua Yu Pengpeng Wang Chunhui Zhou Hanbin Zhao Dongshen Tong Hao Zhang Huimin Yang Shengfu Ji Hao Wang Zhijiang College Zhejiang University of Technology Hangzhou 310024 Zhejiang China Research Group for Advanced Materials & Sustainable Catalysis (AMSC) Research Center for Clay Minerals State Key Laboratory Breeding Base of Green Chemistry Synthesis Technology Discipline of Industrial Catalysis College of Chemical Engineering Zhejiang University of Technology Hangzhou 310 Centre for Future Materials University of Southern Queensland Toowoomba Queensland 4350 Australia Engineering Research Center of Non‐metallic Minerals of Zhejiang Province Zhejiang Institute of Geology and Mineral Resource Hangzhou 310007 Zhejiang China Key Laboratory of High Efficient Processing of Bamboo of Zhejiang Province China National Bamboo Research Center Hangzhou 310012 ZhejiangChina State Key Laboratory of Chemical Resource Engineering Beijing University of Chemical Technology Beijing 100029 China

The use of H2SO4‐,HCl‐,H3PO4‐,and CH3COOH‐activated montmorillonite(Mt)and WOx/H3PO4‐activated Mt as catalysts for the gas‐phase dehydration of glycerol was *** WOx/H3PO4‐activated Mt catalysts were prepared by an impregnation method using H3PO4‐activated Mt(Mt‐P)as the *** catalysts were characterized using powder X‐ray diffraction,Fourier‐transform infrared spectroscopy,N2adsorption‐desorption,diffuse reflectance ultraviolet‐visible spectroscopy,temperature‐programmed desorption of NH3,and thermogravimetric *** acid activation of Mt and WOx loaded on Mt‐P affected the strength and number of acid sites arising from H+exchange,the leaching of octahedral Al3+cations from Mt octahedral sheets,and the types of WOx(2.7≤x≤3)species(i.e.,isolated WO4/WO6‐containing clusters,two‐dimensional[WO6]polytungstates,or three‐dimensional WO3crystals).The strong acid sites were weakened,and the weak and medium acid sites were strengthened when the W loading on Mt‐P was12wt%(12%W/Mt‐P).The12%W/Mt‐P catalyst showed the highest catalytic *** gave a glycerol conversion of89.6%and an acrolein selectivity of81.8%at320°*** deposition on the surface of the catalyst led to deactivation.

关键词： Glycerol Acrolein Dehydration WOx Acid‐activated nanoclay Catalyst

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Vertically stacked holey graphene/polyaniline heterostructures with enhanced energy storage for on-chip micro-supercapacitors

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Nano Research 2016年第4期9卷 1012-1021页

作者： Xiaocong Tian Bei Xiao Xu Xu Lin Xu Zehua Liu Zhaoyang Wang Mengyu Yan Qiulong Wei Liqiang Mai State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 China Department of Chemistry and Biochemistry University of California Los Angeles California 90095 USA Department of Chemistry and Chemical Biology Harvard University Cambridge Massachusetts 02138 USA These authors contributed equally to this work.

Planar micro-supercapacitors （MSCs） have drawn extensive research attention owing to their unique structural design and size compatibility for microelectronic devices. Graphene has been widely used to improve the performance of microscale electrochemical capacitors. However, investigations of an intrinsic electrochemical mechanism for graphene-based microscale devices are still not sufficient. Here, micro-supercapacitors with various typical architectures are fabricated as models to study the graphene effect, and their electrochemical performance is also evaluated. The results show that ionic accessibility and adsorption are greatly improved after the introduction of the holey graphene intermediate layer. This study provides a new route to understand intrinsic electrochemical behaviors and possesses exciting potential for highly efficient on-chip micro-energy storage.

关键词： micro-supercapacitors holey graphene heterostructures ionic accessibility intrinsic electrochemical behaviors

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Hollow spherical LiNi_(0.5)Mn_(1.5)O_4 built from polyhedra with high-rate performance via carbon nanotube modification

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Science China materials 2016年第2期59卷 95-103页

作者：王洛洛胡正耀赵康宁罗艳珠魏湫龙唐春娟胡平任文皓麦立强 State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China

Lithium nickel manganese oxide spinel(Li Ni0.5-Mn1.5O4, LNMO) has attracted much attention as the cathode material for rechargeable lithium-ion batteries due to its high energy density and low cost. However, the short cycle life and poor high-rate capability hinder its commercialization. In this study, we synthesized hollow spherical LNMO built from polyhedral particles. The LNMO hollow structure guarantees sufficient contact with electrolyte and rapid diffusion of lithium ions. To enhance the conductivity, we use carbon nanotubes(CNTs) to modify the surface of the cathode. After CNT modification, the LNMO hollow structure manifests outstanding cycling stability and high-rate capability. It delivers a discharge capacity of 127 m A h g-1 at 5 C, maintaining 104 m A h g-1 after 500 cycles. Even at a high rate of 20 C, a capacity of 121 m A h g-1 can be obtained. The excellent electrochemical performance is ascribed to the unique structure and the enhanced conductivity through CNT modification. It is demonstrated that the CNTmodified hollow spherical LNMO is a promising cathode for lithium ion batteries.

关键词： lithium nickel manganese oxide spinel hollow sphere carbon nanotube modification high-rate performance lithium-ion batteries

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Controlled synthesis of mesoporous nanostructured anatase TiO2 on a genetically modified Escherichia coli surface for high reversible capacity and long-life lithium-ion batteries

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RSC Advances 2016年第64期6卷 59422-59428页

作者： Xue, Shuang-Hong Xie, Hao Ping, Hang Xu, Xiao-Mei Li, Jing Yang, Xiao-Yu Fu, Zheng-Yi Su, Bao-Lian Laboratory of Living Materials State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan430070 China School of Chemistry Chemical Engineering and Life Science Wuhan University of Technology Wuhan430070 China Laboratory of Inorganic Materials Chemistry University of Namur NamurB-5000 Belgium

TiO2 is a promising anode material for lithium-ion batteries. The electrochemical performance of TiO2 can be improved by optimization of nanostructures. The present study was proposed to control the synthesis of mesoporous nanostructured anatase TiO2 on a genetically modified Escherichia coli surface. A recombinant protein INP-SiliSila containing functional domains of silicatein-α and silaffin was constructed and expressed on the E. coli surface. Deposition of the TiO2 precursor was facilitated by INP-SiliSila on the E. coli surface. Upon calcination, TiO2 coating on the E. coli surface transformed to anatase and formed well-defined rod-shaped particles. The electrochemical performance of the as-prepared anatase TiO2 as anode electrodes was improved and better than that of most reported ones. The present study not only provides an organism-based approach for fabricating nanostructured anatase TiO2 with enhanced electrochemical performance, but also opens a new avenue to take advantage of genetically modified bacterial surfaces in the synthesis and structure control of materials. © 2016 The Royal Society of Chemistry.

关键词： Escherichia coli

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Enhanced Strength Through Nanotwinning in the Thermoelectric Semiconductor InSb

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Physical Review Letters 2017年第21期119卷 215503-215503页

作者： Guodong Li Sergey I. Morozov Qingjie Zhang Qi An Pengcheng Zhai G. Jeffrey Snyder State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 China Department of Materials Science and Engineering Northwestern University Evanston Illinois 60208 USA Department of Computer Simulation and Nanotechnology South Ural State University Chelyabinsk 454080 Russia Department of Chemical and Materials Engineering University of Nevada Reno Reno Nevada 89557 USA

The conversion efficiency (zT) of thermoelectric (TE) materials has been enhanced over the last two decades, but their engineering applications are hindered by the poor mechanical properties, especially the low strength at working conditions. Here we used density functional theory (DFT) to show a strength enhancement in the TE semiconductor InSb arising from the twin boundaries (TBs). This strengthening effect leads to an 11% enhancement of the ideal shear strength in flawless crystalline InSb where this theoretical strength is considered as an upper bound on the attainable strength for a realistic material. DFT calculations reveal that the directional covalent bond rearrangements at the TB accommodating the structural mismatch lead to the anisotropic resistance against the deformation combined with the enhanced TB rigidity. This produces a strong stress response in the nanotwinned InSb. This work provides a fundamental insight for understanding the deformation mechanism of nanotwinned TE semiconductors, which is beneficial for developing reliable TE devices.

关键词： material failure Mechanical deformation Semiconductors Stress Density functional theory

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