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Research Article | Open Access

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

Yawen Zhana,b,1, Guobin Zhange,1, Junda Shena,b, Binbin Zhoua,b, Chenghao Zhaoa,b, Junmei Guoc, Ming Wenc, Zhilong Tanc, Lirong Zhengf( ), Jian Lub,d( ), Yang Yang Lia,b( )
Center of Super-Diamond and Advanced Films (COSDAF), City University of Hong Kong, 83 Tat Chee Avenue, Kowloon, Hong Kong, China
Department of Materials Science and Engineering, City University of Hong Kong, 83 Tat Chee Avenue, Kowloon, Hong Kong, China
Kunming Institute of Precious Metals, Sino-platinum Metals Co., Ltd., Kunming, Yunan Province, China
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
Shenzhen Key Laboratory on Power Battery Safety Research and Shenzhen Geim Graphene Center, Tsinghua Shenzhen International Graduate School, Tsinghua University, Shenzhen, 518055, China
Institute of High Energy Physics, Beijing, 100049, China

1 These authors contributed equally to this work and should be considered as co-first authors.

Show Author Information

Abstract

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).

Keywords

ElectrodepositionDealloyingSurface enhanced Raman spectroscopy substratesNoble metalsSurface-alloyed

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Nano Materials Science
Volume 6 Issue 3,
June 2024
Pages 305-311
DOI: 10.1016/j.nanoms.2023.05.002
Cite this article:
Zhan Y, Zhang G, Shen J, et al. Facile electrochemical surface-alloying and etching of Au wires to enable high-performance substrates for surface enhanced Raman scattering. Nano Materials Science, 2024, 6(3): 305-311. https://doi.org/10.1016/j.nanoms.2023.05.002

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Received: 09 February 2023
Accepted: 08 May 2023
Published: 14 September 2023
© 2024 Chongqing University.

This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).
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