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A Gradient model for Young's modulus and Surface Electrode Resistance of Ionic Polymer-metai Composite

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Acta mechanica Solida Sinica 2019年第6期32卷 754-766页

作者： H.G.Liu K.Xiong m.wang Faculty of Civil Engineering and mechanics Jiangsu UniversityZhenjiang 212013China State Key Laboratory of mechanics and Control of mechanical Structures Nanjing University of Aeronautics and Astronauticsf Nanjing 210016China

A new model is proposed to estimate Young's modulus and surface electrode resistance of the ionic polymer-metai composite(IPmC)with a gradient distribution of micros true *** entire IPmC electrode is divided into two parts,i.e.,the porous metal electrode and the gradient polymer-metai composite electrode,according to the geometrie properties of the electroless plated metal *** validity and accuracy of the model are justified by comparing with the experimental observations of IPmC *** differences between model predictions and experimental data of Young's modulus and surface resistance of IPmC samples are+6.8%and-5.5%,respectively,indicating a reasonably good agreement.

关键词： Ionic polymer-metai composite Gradient electrode model Young's modulus Resistance

Strong and ductile mg alloys developed by dislocation engineering

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Journal of materials Science & Technology 2019年第3期35卷 394-395页

作者： m.wang B.B.He m.X.Huang Department of mechanical Engineering The University of Hong Kong Shenzhen Institute of Research and Innovation The University of Hong Kong

Dislocation engineering concept has been successfully employed to tackle the strength-ductility trade-off in steels, resulting in the development of high-strength high-ductility deformed and partitioned(D&P)steel. The present perspective proposes to employ such dislocation engineering concept to develop strong and ductile magnesium(mg) alloys. High density of dislocations could be generated at appropriate temperature and retained in the mg alloy after quenching to room temperature. Those dislocations inherited from the warm deformation could provide dislocation sources when the mg alloy is deformed at room temperature, resulting in good ductility. The high dislocation density generated at warm deformation provides dislocation forest hardening, leading to improved yield strength of mg alloy.

关键词： Dislocation engineering mg alloys Warm rolling Strength and ductility

Recent Progress in the Fabrication, Properties, and Devices of Heterostructures Based on 2D materials

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Nano-micro Letters 2019年第1期11卷 217-240页

作者： Yanping Liu Siyu Zhang Jun He Zhiming m.wang Zongwen Liu School of Physics and Electronics Hunan Key Laboratory for Super-Microstructure and Ultrafast ProcessCentral South University State Key Laboratory of Electronic Thin Films and Integrated Devices University of Electronic Science and Technology of China School of Chemical and Biomolecular Engineering The University of Sydney

With a large number of researches being conducted on two?dimen?sional(2D) materials, their unique properties in optics, electrics, mechanics, and magnetics have attracted increasing attention. Accordingly, the idea of combining distinct functional 2D materials into heterostructures naturally emerged that pro?vides unprecedented platforms for exploring new physics that are not accessible in a single 2D material or 3D heterostructures. Along with the rapid development of controllable, scalable, and programmed synthesis techniques of high?quality 2D heterostructures, various heterostructure devices with extraordinary performance have been designed and fabricated, including tunneling transistors, photodetectors, and spintronic devices. In this review, we present a summary of the latest progresses in fabrications, properties, and applications of di erent types of 2D heterostruc?tures, followed by the discussions on present challenges and perspectives of further investigations.

关键词： Two-dimensional(2D) materials 2D heterostructures Charge and magnetotransport Electronic and optoelectronic devices

Advances in moS_2-Based Field Effect Transistors(FETs)

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Nano-micro Letters 2015年第3期7卷 203-218页

作者： Xin Tong Eric Ashalley Feng Lin Handong Li Zhiming m.wang Institute of Fundamental and Frontier Sciences University of Electronic Science and Technology of China State Key Laboratory of Electronic Thin Films and Integrated Devices University of Electronic Science and Technology of China

This paper reviews the original achievements and advances regarding the field effect transistor(FET) fabricated from one of the most studied transition metal dichalcogenides: two-dimensional mo S2. Not like graphene, which is highlighted by a gapless Dirac cone band structure, monolayer mo S2 is featured with a 1.9 e V gapped direct energy band thus facilitates convenient electronic and/or optoelectronic modulation of its physical properties in FET structure. Indeed,many mo S2 devices based on FET architecture such as phototransistors, memory devices, and sensors have been studied and extraordinary properties such as excellent mobility, ON/OFF ratio, and sensitivity of these devices have been exhibited. However, further developments in FET device applications depend a lot on if novel physics would be involved in them. In this review, an overview on advances and developments in the mo S2-based FETs are presented. Engineering of mo S2-based FETs will be discussed in details for understanding contact physics, formation of gate dielectric, and doping strategies. Also reported are demonstrations of device behaviors such as low-frequency noise and photoresponse in mo S2-based FETs, which is crucial for developing electronic and optoelectronic devices.

关键词： mo S2FETs engineering Low-frequency noise Optical properties mo S2sensors mo S2memory devices

Effect of grain size on iron-boride nanoglasses

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Journal of materials Science & Technology 2023年第10期141卷 116-123页

作者： melody m.wang mehrdad T.Kiani Abhinav Parakh Yue Jiang X.Wendy Gu Department of materials Science and Engineering Stanford UniversityStanfordCA 94305USA Department of mechanical Engineering Stanford UniversityStanfordCA 94305USA

metallic nanoglasses are made of amorphous grains that are separated by lower-density amorphous boundaries,which have been proposed to enhance plasticity through the deflection of cracks and shear bands at *** has been difficult to experimentally control grain size and interfacial structure to understand their roles in plastic ***,we fabricate bulk nanoglasses via compaction and sintering of colloidally synthesized amorphous iron-boride *** nanoglasses have amor-phous grains with diameters from 116 nm to 576 nm and were tested using nanoindentation and mi-cropillar *** nanoglass with a grain size of 576 nm shows the highest elastic modulus and hardness of 101 GPa and 7.4 GPa,*** electron microscopy reveals that nanocrys-tals form within the nanoglasses during *** nanocrystal density correlates with higher nanoparticle crystallization enthalpy,an increase in plasticity,and a decrease in yield *** strain of 5.0%,yield strength of 3.8 GPa,and ultimate compressive strength of 2.7-3.8 GPa were *** show that the compaction of colloidal metallic glass nanoparticles results in robust bulk samples,with mechanical properties similar to that of other iron-based bulk metallic glasses.

关键词： Colloidal Nanoparticles Interface Nanoindentation micropillar Plasticity

Holed Nanostructures Formed by Aluminum Droplets on a GaAs Substrate

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Nano Research 2010年第7期3卷 490-495页

作者： Alvason Zhenhua Li Zhiming m.wang Jiang Wu Gregory J.Salamo Institute of Nanoscale Science and Engineering University of ArkansasFayettevilleArkansas 72701USA

We have studied the morphology evolution of holed nanostructures formed by aluminum droplet epitaxy on a GaAs *** outer rings with concentric inner holed rings were ***,an empirical equation to describe the size distribution of the outer rings in the holed nanostructures has been *** contour line generated by the equation provides physical insights into quantum ring formation by droplets of groupⅢmaterials onⅢ-Ⅴsubstrates.

关键词： Droplet epitaxy aluminum droplets mBE GaAs holed nanostructures

A Review: Enhanced Anodes of Li/Na-Ion Batteries Based on Yolk–Shell Structured Nanomaterials

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Nano-micro Letters 2018年第3期10卷 24-41页

作者： Cuo Wu Xin Tong Yuanfei Ai De-Sheng Liu Peng Yu Jiang Wu Zhiming m.wang Institute of Fundamental and Frontier Sciences University of Electronic Science and Technology of China Department of Electronic and Electrical Engineering University College London

Lithium-ion batteries(LIBs) and sodium-ion batteries(SIBs) have received much attention in energy storage system. In particular, among the great efforts on enhancing the performance of LIBs and SIBs, yolk–shell(YS) structured materials have emerged as a promising strategy toward improving lithium and sodium storage. YS structures possess unique interior void space, large surface area and short diffusion distance, which can solve the problems of volume expansion and aggregation of anode materials, thus enhancing the performance of LIBs and SIBs. In this review, we present a brief overview of recent advances in the novel YS structures of spheres, polyhedrons and rods with controllable morphology and compositions. Enhanced electrochemical performance of LIBs and SIBs based on these novel YS structured anode materials was discussed in detail.

关键词： Yolk–shell structure Lithium-ion batteries Sodium-ion batteries

Ordered SrTiO_3 Nanoripples Induced by Focused Ion Beam

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Nano-micro Letters 2012年第4期4卷 243-246页

作者： Jiang Wu Gang Chen Zhaoquan Zeng Shibin Li Xingliang Xu Zhiming m.wang Gregory J.Salamo State Key Laboratory of Electronic Thin Films and Integrated Devices University of Electronic Science and Technology of China Institute of Intelligent Optoelectronic Technology Zhejiang University of Technology Institute for Nanoscience and Engineering University of Arkansas

Ordered nanoripples on the niobium-doped SrTiO_3 surfaces were fabricated through focused ion beam bombardment. The surface morphology of the SrTiO_3 nanoripples was characterized using in situ focused ion beam/scanning electron microscopy. The well-aligned SrTiO_3 nanostructures were obtained under optimized ion irradiation conditions. The characteristic wavelength was measured as about 210 nm for different ion beam currents. The relationship between the ion irradiation time and current and SrTiO_3 surface morphology was analyzed. The presented method will be an effective supplement for fabrication of SrTiO_3 nanostructures that can be used for ferroelectric and electronic applications.

关键词： SrTiO3 focused ion beam nanoripple self-assembly

工艺参数扰动下互连线时延的随机点匹配评估算法

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物理学报 2009年第6期58卷 3603-3610页

作者：李鑫 Janet m.wang 唐卫清南京理工大学计算机科学与技术学院南京210094 亚利桑那大学电子工程系中国科学院计算技术研究所北京100190

提出了一种基于工艺参数扰动的随机点匹配时延评估算法.该算法通过Cholesky分解将具有强相关性的工艺随机扰动转化为独立随机变量,并结合随机点匹配方法和多项式混沌理论对耦合随机互连线模型进行时延分析.最后,利用数值计算方法给出互... 详细信息

提出了一种基于工艺参数扰动的随机点匹配时延评估算法.该算法通过Cholesky分解将具有强相关性的工艺随机扰动转化为独立随机变量,并结合随机点匹配方法和多项式混沌理论对耦合随机互连线模型进行时延分析.最后,利用数值计算方法给出互连时延的有限维表达式.仿真实验结果表明,该算法与HSPICE仿真时延的相对误差不超过2%,且相比于HSPICE显著降低了电路模拟时间.

关键词：工艺参数扰动随机互连模型随机点匹配方法多项式混沌理论