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Ultra-large Elasticity in Nanoscale Covalent Crystals: Silicon and Diamond
时间:2018-06-04 15:18    点击:   所属单位:机电工程学院
讲座名称 Ultra-large Elasticity in Nanoscale Covalent Crystals: Silicon and Diamond
讲座时间 2018-06-11 10:00:00
讲座地点 北校区主楼三区143南第二会议室
讲座人 Yang LU, Assoc. Prof.
讲座人介绍 Dr. Yang LU is currently an AssociateProfessor inthe Department of Mechanical and Biomedical Engineering at City University of Hong Kong. He obtained his B.S. degree in Physics/Microelectronics from Nanjing Universityand Ph.D degree from Rice University. Before joining in CityU as a faculty member in 2012, he didpostdoctoral research in Massachusetts Institute of Technology (MIT) for nearly two years. Dr. Lu has extensive experiences in nanomechanics and nanomanufacturing. His group has made some importantcontributions in discovering“ultra-large elasticity” in nanoscale covalent crystalssuch as1D silicon and diamond nanostructures, respectively. As the first or corresponding author, Dr. Lu has published more than 40 research papers in leading academic journals like Science, Nature Nanotechnology, Science Advancesetc,with total citation over 1000and H-index over 15. He serves as Managing Editor of Materials Today, a flagship journal (2016 Impact Factor: 21.7) of materials science, and editorial board member of SCIENCE CHINA Technological Sciencesand Scientific Reports. Dr. Lu is a recipient of UGC Early Career Award 2013/2014 awarded by Hong Kong University Grants Committee, CityU Outstanding Supervisor Award 2017, and The President’s Award of City University of Hong Kong in 2018.
 
 
讲座内容 Due to the interesting physical, chemical, optical and electrical properties, nanoscalecrystalshave stimulated great interests in the past decades. However, the ability to achieve the full potential of these nanoscale building blocks in their functional device applications is ultimately limited by how they will behave at the relevant length scales, in particular, their mechanical performance and reliability. In this talk, we show our recent nanomechanical study of free-standing covalent crystal nanostructures including semiconductor nanowires and nanoneedles. Based on our in situ testing platform, we showed that VLS-grown single crystalline silicon nanowires with diameters ~100nm can be repeatedly stretched above 10% elastic strain at room temperature, with a few cases up to 16% tensile strain, approaching the theoretical elastic limit of silicon. Then we further characterized the bending flexural behavior of single and poly-crystalline diamond nanoneedles and found that single-crystalline diamond nanoneedles are capable of undergoing ultra-large elastic bending deformation (up to ~9% local tensile strain) approaching the theoretical elastic strain limit of diamond, with the corresponding local stress (about 89-98GPa) approaching the ideal strength. In addition to the promising “flexible electronics” applications, our results also indicate that nanoscale covalent crystals could have tunable band structures under ultra-large elastic strain for the emerging “elastic strain engineering”.
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