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
讲座人：
李扬扬
形式：
校区：
兴庆校区
实践学分：
讲座内容：
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
时间：2018年12月21日，上午10:30
主办单位：前沿科学技术研究院
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.
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