title: Highly sensitive and well reproducible Surface-enhanced Raman spectroscopy from silver triangular platelets.
abstract: Recently, considerable efforts have been made to prepare Surface-enhanced Raman scattering (SERS) nanostructures with high sensitivity and good reproducibility, which are always difficult and costly. In this article, we provide a simple route on the synthesis of silver particles with a novel single {111} plane and triangular morphology by reducing silver nitrate with poly(vinyl pyrrolidone) (PVP) in N,N-dimethylformamide (DMF) solutions. The results show that the Raman intensities of rhodamine 6G (R6G) decrease with decreasing the loading concentration and that R6G loading follows the first-order adsorption kinetics. Even at a low concentration of 10-12M, the signatures of R6G in Raman spectrum are still clearly observed. It indicates that the silver triangular platelets (i.e. AgTP) can offer sufficient active sites to efficiently capture the R6G molecules from the loading solution, and exhibit high SERS sensitivity. In addition, the relative standard deviation (RSD) of band at 1650cm-1is calculated to be 13.7%, 12.7%, 15.7%, 15.1%, 13.3%, and 13.1%, respectively, corresponding with the concentration of R6G from 10-6M to 10-12M, which reveals the nanometer-scale AgTP can provide abundant hot spots and exhibit excellent reproducibility. This method offers an easy and low-cost way to prepare AgTP substrates and makes SERS detection more practicable.
authors: Key Laboratory of Optoelectronic Chemical Materials and Devices, Ministry of Education, School of Chemical and Environmental Engineering, Jianghan University, Wuhan 430056, China. Electronic address: ceshcl@jhun.edu.cn.
authors: Chenglong
authors: C
authors: Hu
authors: Key Laboratory of Optoelectronic Chemical Materials and Devices, Ministry of Education, School of Chemical and Environmental Engineering, Jianghan University, Wuhan 430056, China.
authors: Shaoyun
authors: S
authors: Chen
authors: Key Laboratory of Optoelectronic Chemical Materials and Devices, Ministry of Education, School of Chemical and Environmental Engineering, Jianghan University, Wuhan 430056, China.
authors: Yuan
authors: Y
authors: Wang
authors: Key Laboratory of Optoelectronic Chemical Materials and Devices, Ministry of Education, School of Chemical and Environmental Engineering, Jianghan University, Wuhan 430056, China.
authors: Xueqing
authors: X
authors: Liu
authors: Key Laboratory of Optoelectronic Chemical Materials and Devices, Ministry of Education, School of Chemical and Environmental Engineering, Jianghan University, Wuhan 430056, China.
authors: Jiyan
authors: J
authors: Liu
authors: Instrumental Analysis and Research Center, Sun Yat-sen University, Guangzhou 510275, China.
authors: Weihong
authors: W
authors: Zhang
authors: Instrumental Analysis and Research Center, Sun Yat-sen University, Guangzhou 510275, China.
authors: Jian
authors: J
authors: Chen
authors: School of Materials and Chemical Engineering, Xi'an Technological University, Xi'an 710021, China.
authors: Wenzhi
authors: W
authors: Zhang
keywords: Reproducibility; Silver; Surface-enhanced Raman scattering; Triangular morphology