Morphology-regulated core–shell Ag@Au NPs for rapid SERS detection of 1-amino-hydantoin (AHD) in crayfish. Issue 1 (31st December 2022)

• Record Type: Journal Article
• Authors: Li, Peizhen; Xia, Xiuhua; Chen, Jiannan; Yu, Hang; Xie, Yunfei; Guo, Yahui; Yao, Weirong; Qian, He; Cheng, Yuliang
• Is Part Of: Food and agricultural immunology. Volume 33:Issue 1(2022)
• Page Start: 832
• Page End: 847
• Publication Date: 2022-12-31
• Subjects: SERS detection -- core–shell Ag@Au NPs -- seed-mediated approach -- 1-amino-hydantoin; Immunochemistry -- Periodicals; Food -- Analysis -- Periodicals; Immunoassay -- Periodicals; 616.079
• DOI: 10.1080/09540105.2022.2144145
• Languages: English
• ISSNs: 0954-0105

Abstract

ABSTRACT: Gold-coated silver core–shell nanoparticles (Ag@Au NPs) have been widely used for SERS analysis due to plasmon resonance performances. However, it is a great challenge to fabricate Ag@Au core–shell structures with specified morphology. In this paper, the size and shape of Ag NPs (core) were precisely controlled by a seed-mediated approach, and then the gold shell was completely coated on under the strong reduction of ascorbic acid, resulting in Ag@Au NPs with highly regulated morphology. The obtained Ag@Au NPs achieved a similar or even better SERS enhancement factor (EF) (up to 5.7 × 10 7 ) compared to Ag NPs, but significantly higher stability. For the rapid SERS detection of nitrofurantoin metabolite AHD, a limit of detection (LOD) as low as 1 × 10 −10 M and a wide linear range from 1 × 10 −4 to 1 × 10 −8 M were obtained. Furthermore, recoveries for crayfish samples were from 90.5% to 108%, indicating a good performance of the presented method in real sample detection.