Size Dependent SERS Activity of Gold Nanoparticles Studied by 3D-FDTD Simulation
Date
2009Author
Li, Li-mei
李丽美
Fang, Ping-ping
方萍萍
Yang, Yang, Zhi-lin
杨志林
Huang, Wen-da
黄文达
Wu, De-yin
吴德印
Ren, Bin
任斌
Tian, Zhong-qun
田中群
Collections
- 物理技术-已发表论文 [4223]
Abstract
By synthesizing Au nanoparticles with the controllable size from about 16 to 160 nm and measuring their SERS activity, the authors found that Au nanoparticles film with a size in the range of 120-135 nm showed the highest SERS activity with the 632.8 nm excitation, which is different from previous experimental results and theoretical predictions. The three dimensional finite difference time domain (3D-FDTD) method was employed to simulate the size dependent SERS activity. At the 632.8 nm excitation, the particles with a size of 110 nm shows the highest enhancement under coupling condition and presents an enhancement as high as 10(9) at the hot site. If the enhancement is averaged over the whole surface, the enhancement can still be as high as 10(7), in good agreement with our experimental data. For Au nanoparticles with a larger size such as 220 nm, the multipolar effect leads to the appearance of the second maximum enhancement with the increase in particles size. The averaged enhancement for the excitation line of 325 nm is only 10(2).
Citation
SPECTROSCOPY AND SPECTRAL ANALYSIS,2009,29(5):1222-1226URI
http://dx.doi.org/10.3964/j.issn.1000-0593(2009)05-1222-05https://dspace.xmu.edu.cn/handle/2288/11115