Facile electrochemical surface-alloying and etching of Au wires to enable high-performance substrates for surface enhanced Raman scattering  

作　　者：Yawen Zhan Guobin Zhang Junda Shen Binbin Zhou Chenghao Zhao Junmei Guo Ming Wen Zhilong Tan Lirong Zheng Jian Lu Yang Yang Li 

机构地区：[1]Center of Super-Diamond and Advanced Films(COSDAF),City University of Hong Kong,83 Tat Chee Avenue,Kowloon,Hong Kong,China [2]Department of Materials Science and Engineering,City University of Hong Kong,83 Tat Chee Avenue,Kowloon,Hong Kong,China [3]Kunming Institute of Precious Metals,Sino-platinum Metals Co.,Ltd.,Kunming,Yunan Province,China [4]Centre for Advanced Structural Materials,City University of Hong Kong Shenzhen Research Institute,8 Yuexing 1st Road,Shenzhen Hi-Tech Industrial Park,Nanshan District,Shenzhen,China [5]Shenzhen Key Laboratory on Power Battery Safety Research and Shenzhen Geim Graphene Center,Tsinghua Shenzhen International Graduate School,Tsinghua University,Shenzhen,518055,China [6]Institute of High Energy Physics,Beijing,100049,China

出　　处：《Nano Materials Science》2024年第3期305-311,共7页纳米材料科学（英文版）

基　　金：supported by Shenzhen-Hong Kong Science and Technology Innovation Cooperation Zone Shenzhen Park (Project HZQBKCZYB-2020030);National Key R&D Program of China (Project 2017YFA0204403);the National Natural Science Foundation of China (Project 51590892);the Major Program of Changsha Science and Technology (Project kh2003023);the Innovation and Technology Commission of HKSAR through Hong Kong Branch of National Precious Metals Material Engineering Research Centre,and the City University of Hong Kong (Project 9667207)。

摘　　要：Surface-enhanced Raman Spectroscopy(SERS)is a nondestructive technique for rapid detection of analytes even at the single-molecule level.However,highly sensitive and reliable SERS substrates are mostly fabricated with complex nanofabrication techniques,greatly restricting their practical applications.A convenient electrochemical method for transforming the surface of commercial gold wires/foils into silver-alloyed nanostructures is demonstrated in this report.Au substrates are treated with repetitive anodic and cathodic bias in an electrolyte of thiourea,in a one-pot one-step manner.X-rays absorption fine structure(XAFS)spectroscopy confirms that the AuAg alloy is induced at the surface.The unique AuAg alloyed surface nanostructures are particularly advantageous when served as SERS substrates,enabling a remarkably sensitive detection of Rhodamine B(a detection limit of 10^(-14)M,and uniform strong response throughout the substrates at 10^(-12)M).

关 键 词：ELECTRODEPOSITION DEALLOYING Surface-alloyed Noble metals Surface enhanced Raman spectroscopy substrates 

分 类 号：O657.37[理学—分析化学] O646[理学—化学]