Electrochemically nano-roughened metals for improved device performance

讲座名称: Electrochemically nano-roughened metals for improved device performance
讲座时间 2018-12-21
讲座地点 西二楼A102,曲江校区
讲座人 李扬扬

讲座人:李扬扬  副教授 香港城市大学材料科学与工程系 Dept. of Materials Science and Engineering, City University of Hong Kong
地点:西二楼 A102,曲江校区

Metal foams/meshes have been widely applied in various fields (e.g. heat exchangers, filters, energy/sound absorbers, electrodes) owing to its low cost, easy fabrication, good mechanical properties, high porosity, light weight, and high thermal and electrical conductivities. Nevertheless, conventional metal foams/meshes feature bulky structural features and smooth ligaments, possessing very low specific surface area. To address this difficulty, current strategies focus on depositing foreign nanostructures of larger surface area onto the foams/meshes, which suffers from easy detachment with limited applications. There is a pressing need for a convenient and universal method to effectively increase the surface area of metal foams/meshes. Here we present a facile and economical electrochemical method to bestow metal foams/meshes with a nanostructured surface of large area. Different from those previous efforts of coating metal foams with foreign species, we utilize a new approach by directly roughening the framework ligaments in a one-pot one-step manner through repetitive electrodeposition and dealloy treatments. The treated high surface-area metals enable greatly improved performance for different applications, e.g., as surface enhanced Raman spectroscopy (SERS) substrates. The method reported here represents a universal solution for effectively roughening metal foams and thus open a new route to high-performance metallic materials in wide-ranging applications.


李扬扬(Yang Yang Li),香港城市大学材料科学与工程系副教授,香港城市大学超金刚石及硬质薄膜实验(COSDAF)核心成员。李教授于1998年在北京大学化学系获学士学位,2000年在新加坡南洋理工大学获材料学硕士学位,2004年在美国加州大学圣地亚哥分校获材料科学与工程学博士学位。2004年-2007年,于位于美国加州尔湾的日立化学研究中心担任研究科学家,2007年起任教于香港城市大学物理及材料科学系。研究方向为金属基、半导体基、及陶瓷基多功能纳米材料,包括光子材料、磁性材料、生物材料及新型电极材料,着重于材料的简便电化学制备及其在光学、能源环境及生物医药方面的应用研究。以第一作者及通讯作者在Science, Adv. Mater., ACS Nano, Small, Optics Letters等国际学术期刊上发表论文多篇。担任数个国际期刊(如Materials Letters,Materials Research Express)编委或创刊顾问,在国际会议上做大会报告和特邀报告多次,并多次担任国际学术会议组织者或分会主席。

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