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Two-dimension Flower-Shaped Au@Ag Nanoparticle Arrays as Effective SERS Substrates with Highly Sensitivity and Reproducibility for Detection of Thiram

Abstract

A simple and controllable route is presented for construction of two-dimension (2D) flower-shaped Au@Ag nanoparticle (NP) arrays through in-situ chemical reduction growth of Ag nanosheets on the Au NP arrays. Such micro/nanostructured arrays composed of interlaced Ag nanosheets can act as a good candidate for SERS substrate due to a lot of “hot spots” generated by the rough surface of the nanosheets and small nanogaps less than 10 nm between the Au@Ag NPs. After optimizing the experimental parameters (the array periodicity of 500 nm and the growth time of 20 min), the flower-shaped Au@Ag NP array as a SERS substrate has a low detection limit (10-11 M) of thiram, which is commonly used pesticide molecules and causes environmental pollution due to the excessive use. They also exhibit very good SERS signal uniformity and repeatability (RSD≈7.4%) because abundance of “hot spots” and highly ordered structures on a large scale. Such 2D flower-shaped Au@Ag NP arrays with economical preparation and excellent SERS property are meaningful for the practical applications of organic molecular Raman detection.

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Supplementary files

Article information


Submitted
02 Dec 2019
Accepted
23 Jan 2020
First published
27 Jan 2020

J. Mater. Chem. C, 2020, Accepted Manuscript
Article type
Paper

Two-dimension Flower-Shaped Au@Ag Nanoparticle Arrays as Effective SERS Substrates with Highly Sensitivity and Reproducibility for Detection of Thiram

C. Xing, S. Zhong, J. Yu, X. Li, A. Cao, D. Men, B. Wu, W. Cai and Y. Li, J. Mater. Chem. C, 2020, Accepted Manuscript , DOI: 10.1039/C9TC06577F

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