摘要
利用柠檬酸钠还原硝酸银的原理,提出了一种微波加热制备银胶体粒子的新方法,得到了颗粒大小较均匀的灰色银胶体。以提纯后的银胶为表面增强拉曼散射衬底,研究了超低浓度染料大分子罗丹明6G分子的表面增强拉曼散射,得到浓度分别为10-12mol/L、10-13mol/L和10-14mol/L的罗丹明6G的表面增强拉曼散射光谱,初步实现了罗丹明6G的单分子检测,证明该新型银胶衬底有非常强的表面增强拉曼活性。同时根据表面增强拉曼散射“热点”的增强机理,分析了获得超低浓度R6G的表面增强拉曼光谱的原因。
A novel gray silver colloid was prepared by silver nitrate solution reduced with sodium citrate consisting of spherical silver particles which in narrow size distribution. The detection of single molecular level of R6G was obtained with the use of surface - enhanced Raman scattering. Solution of different concentration （ 10^-12mol/L、10-13mol/L 和 10^- 14mol/L ） was observed. The theory of ＂hot spots＂ is analyzed to explain the possible reasons why the single molecule was found.
出处
《光散射学报》
2007年第1期11-15,共5页
The Journal of Light Scattering
