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Silver nanoplates: controlled preparation, self-assembly, and applications in surface-enhanced Raman scattering |
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| Authors: | Zao Yi Xibin Xu Xiaoqiang Wu Chaohua Chen Xibo Li Bingchi Luo Jiangshan Luo Xiaodong Jiang Weidong Wu Yougen Yi Yongjian Tang |
| Institution: | 1. College of Physics and Electronics, Central South University, Changsha, 410083, China 2. Research Center of Laser Fusion, China Academy of Engineering Physics, Mianyang, Sichuan, 621900, China 3. Science and Technology on Plasma Physics Laboratory, China Academy of Engineering Physics, Mianyang, Sichuan, 621900, China 4. Department of Materials Science and Engineering, Xihua University, Chengdu, 610039, China |
| Abstract: | Silver nanoplates were prepared in a dual reduction system with NaBH4 and sodium citrate both as reducing agents. And then the as-prepared nanoplates could be growing up through multistage growth methodology. The average edge length of Ag nanoplates can be tailored from 40 nm to 260 nm without changing their shape, crystallinity, and the average thickness. Furthermore, the effectiveness of these silver nanoplates as substrates prepared by the silanization self-assembly method toward surface-enhanced Raman scattering (SERS) detection was evaluated by using 4-aminothiophenol (4-ATP) and rhodamine 6G (R6G) as probe molecules. It was found that the enhancement ability of the silver nanoplates film is remarkable lower than that of the spherical silver nanoparticle film. The reason is attributed to the electromagnetic mechanism and chemical mechanism. This work will be of great significance in understanding the SERS enhancement mechanism and in the fabrication of nanoparticle films for biosensing. |
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