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Size-dependent transition of the deformation behavior of au nanowires

Nano Research 2015年第3期8卷 941-947页

作者： Na-Young Park Ho-Seok Nam PiI-Ryung Cha Seung-Cheol Lee School of Advanced Materials Engineering Kookmin University Seou1136-702 R. O. Korea Future Convergence Research Division Korea Institute of Science and Technology (KIST) Seou1136-791 R. O. Korea Indo-Korea Science and Technology Center Korea Institute of Science and Technology (KIST) Seou1136-791 R. O. Korea

Inspired by the controversy over tensile deformation modes of single-crystalline 〈110〉/{111} au nanowires, we investigated the dependency of the deformation mode on diameters of nanowires using the molecular dynamics technique. A new criterion for assessing the preferred deformation mode-slip or twin propagation--of nanowires as a function of nanowire diameter is presented. The results demonstrate the size-dependent transition, from superplastic deformation mediated by twin propagation to the rupture by localized slips in deformed region as the nanowire diameter decreases. Moreover, the criterion was successfully applied to explain the superplastic deformation of Cu nanowires.

关键词： au nanowire molecular dynamics size-dependent transition tensile deformationmechanism

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In situ atomistic observation of the deformation mechanism of au nanowires with twin–twin intersection

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Journal of Materials Science & Technology 2020年第18期52卷 118-125页

作者： Shuchun Zhao Qi Zhu Xianghai An Hua Wei Kexing Song Scott X.Mao Jiangwei Wang Center of Electron Microscopy and State Key Laboratory of Silicon Materials School of Materials Science&EngineeringZhejiang UniversityHangzhou 310027China School of Aerospace Mechanical&Mechatronic EngineeringThe University of SydneySydney 2006Australia Center for Hypergravity Experimental and Interdisciplinary Research.Zhejiang University Hangzhou 310027China School of Materials Science&Engineering Henan University of Science and TechnologyLuoyang 471023China Department of Mechanical Engineering and Materials Science University of PittsburghPittsburgh Pennsylvania15261USA

Twin–twin intersections are often observed in face-centered cubic(FCC)metallic nanostructures,which have important contributions to the plastic deformation and strengthening of FCC metals with low stacking fault ***,a deep insight into the underlying mechanism involved in the formation and evolution of twin–twin intersections remains largely lacking,especially in ***,by conducting the in situ straining experiments under high resolution transmission electron microscope(TEM),we directly visualize the dynamic evolution of a twin–twin intersection in au nanowire at the *** shows that dislocations in the incoming twin can either glide onto or transmit across the barrier twin via dislocation interaction with the twin boundary,resulting in the twin–twin *** twinning and de-twinning of the twin–twin intersection govern the whole deformation of the *** findings reveal the dynamic behaviors of twin–twin intersection under mechanical loading,which benefits further exploration of FCC metals and engineering alloys with twin–twin intersection structures.

关键词： In situ TEM Twin-twin intersection au nanowire Twinning/de-twinning Dislocation-twin interaction

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Conductive au nanowires regulated by silk fibroin nanofibers

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Frontiers of Materials Science 2014年第1期8卷 102-105页

作者： Bo-Ju DONG Qiang LU National Engineering Laboratory for Modern Silk College of Textile and Clothing Engineering Soochow University Suzhou 215123 China

Conductive au-biopolymer composites have promising applications in tissue engineering such as nerve tissue regeneration. In this study, silk fibroin nanofibers were formed in aqueous solution by regulating silk self-assembly process and then used as template for au nanowire fabrication. We performed the synthesis of au seeds by repeating the seeding cycles for several times in order to increase the density of au seeds on the nanofibers. After electroless plating, densely decorated au seeds grew into irregularly shaped particles following silk nanofiber to fill the gaps between particles and finally form uniform continuous nanowires. The conductive property of the au-silk fibroin nanowires was studied with current-voltage （I-V） measurement. A typical ohmic behavior was observed, which highlighted their potential applications in nerve tissue regeneration.

关键词： silk au nanowire electrical conductivity biological device

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Novel voltage signal at proximity-induced superconducting transition temperature in gold nanowires

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Science China(Physics,Mechanics & Astronomy) 2018年第8期61卷 69-74页

作者： Jian Wang JunXiong Tang ZiQiao Wang Yi Sun QingFeng Sun Moses H.W.Chan International Center for Quantum Materials School of PhysicsPeking UniversityBeijing 100871China Collaborative Innovation Center of Quantum Matter Beijing 100871China State Key Laboratory of Low-Dimensional Quantum Physics Department of PhysicsTsinghua UniversityBeijing 100084China Department of Physzcs The Pennsylvania State UniversityPennsylvania 16802-6300USA CAS Center for Excellence in Topological Quantum Computation University of Chinese Academy of SciencesBeijing 100190China Department of Physics University of Colorado BoulderCO 80309USA

We observed a novel voltage peak in the proximity-induced superconducting gold(au) nanowire while cooling the sample through the superconducting transition temperature. The voltage peak turned dip during warming. The voltage peak or dip was found to originate respectively from the emergence or vanishing of the proximity-induced superconductivity in the au *** amplitude of the voltage signal depends on the temperature scanning rate, and it cannot be detected when the temperature is changed slower than 0.03 K/min. This transient feature suggests the non-equilibrium property of the effect. Ginzburg-Landau model clarified the voltage peak by considering the emergence of Cooper pairs of relatively lower free energy in superconducting W contact and the non-equilibrium diffusion of Cooper pairs and quasiparticles.

关键词： proximity-induced superconductivity au nanowire non-equilibrium process

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