Effect of Aspect Ratio Distribution on Localized Surface Plasmon Resonance Extinction Spectrum of Gold Nanorods  

作　　者：陶俊 鲁拥华 郑荣升 林开群 谢志国 罗昭锋 李胜利 王沛 明海 

机构地区：[1]Department of Physics, Anhui Key Laboratory of Optoelectronic Science and Technology, University of Science and Technology of China, Hefei 230026 [2]School of Life Science, University of Science and Technology of China, Hefei 230026

出　　处：《Chinese Physics Letters》2008年第12期4459-4462,共4页中国物理快报（英文版）

基　　金：Supported by the National Basic Research Programme of China under Grant No 2006cb302905, the National Key Science Foundation of China under Grant No 60736037, the National Science Foundation of China under Grant No 10704070, the High-Technology Research and Development Programme of China under Grant No 2007AA06Z420, and the Science and Technological Fund of Anhui Province for Outstanding Youth （08040106805）.

摘　　要：Gold nanorods with different aspect ratios are prepared in micells using a seeded growth method. Their extinction spectra are observed with an UV-visible spectrophotometer and analysed theoretically. It is known that there are two plasmon resonance peaks for gold nanorod corresponding to transverse and longitudinal plasmon resonance respectively. Moreover, the longitudinal plasmon resonance peak shifts to long wavelength when we increase the aspect ratio determined from TEM. Especially, we model the extinction spectrum using Gans＇ theory and compare it with our experimental result. Considering the aspect radios distribution of gold nanorods, it is found that longitudinal plasmon resonance peak will be wider than the nanorods with single aspect ratio, which is consistent with our experimental result. In addition, the effect of dielectric constant of surrounding medium is considered.Gold nanorods with different aspect ratios are prepared in micells using a seeded growth method. Their extinction spectra are observed with an UV-visible spectrophotometer and analysed theoretically. It is known that there are two plasmon resonance peaks for gold nanorod corresponding to transverse and longitudinal plasmon resonance respectively. Moreover, the longitudinal plasmon resonance peak shifts to long wavelength when we increase the aspect ratio determined from TEM. Especially, we model the extinction spectrum using Gans＇ theory and compare it with our experimental result. Considering the aspect radios distribution of gold nanorods, it is found that longitudinal plasmon resonance peak will be wider than the nanorods with single aspect ratio, which is consistent with our experimental result. In addition, the effect of dielectric constant of surrounding medium is considered.

关 键 词：field emission molybdenum dioxide enhancement factor 

分 类 号：O433[机械工程—光学工程]