High-Performance Au@Ag Nanorods Substrate for SERS Detection of Malachite Green in Aquatic Products

Author:

Zhou Xiaoxiao12,Chen Shouhui34,Pan Yi3,Wang Yuanfeng5ORCID,Xu Naifeng5ORCID,Xue Yanwen34,Wei Xinlin3,Lu Ying126ORCID

Affiliation:

1. College of Food Science and Technology, Shanghai Ocean University, Shanghai 201306, China

2. Laboratory of Quality & Safety Risk Assessment for Aquatic Products on Storage and Preservation, Ministry of Agriculture, Shanghai 201306, China

3. Department of Food Science & Technology, School of Agriculture and Biology, Shanghai Jiao Tong University, Shanghai 200240, China

4. Food Safety Engineering and Technology Research Centre (Shanghai), Shanghai 200240, China

5. Institute of Food Engineering, College of Life Science, Shanghai Normal University, 100 Guilin Road, Xuhui District, Shanghai 200234, China

6. Marine Biomedical Science and Technology Innovation Platform of Lingang New Area, Shanghai 201306, China

Abstract

In order to improve the detection performance of surface-enhanced Raman scattering (SERS), a low-cost Au@Ag nanorods (Au@Ag NRs) substrate with a good SERS enhancement effect was developed and applied to the detection of malachite green (MG) in aquaculture water and crayfish. By comparing the SERS signal enhancement effect of five kinds of Au@Ag NRs substrates with different silver layer thickness on 4-mercaptobenzoic acid (4-MBA) solution, it was found that the substrate prepared with 100 µL AgNO3 had the smallest aspect ratio (3.27) and the thickest Ag layer (4.1 nm). However, it showed a good signal enhancement effect, and achieved a detection of 4-MBA as low as 1 × 10−11 M, which was 8.7 times higher than that of the AuNRs substrate. In addition, the Au@Ag NRs substrate developed in this study was used for SRES detection of MG in crayfish; its detection limit was 1.58 × 10−9 M. The developed Au@Ag NRs sensor had the advantages of stable SERS signal, uniform size and low cost, which provided a new tool for SERS signal enhancement and highly sensitive SERS detection method development.

Funder

National Key R&D Program of China

Shanghai Agriculture Applied Technology Development Program, China

Publisher

MDPI AG

Subject

Clinical Biochemistry,General Medicine,Analytical Chemistry,Biotechnology,Instrumentation,Biomedical Engineering,Engineering (miscellaneous)

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