Yu Hai-hu, Jiang De-sheng
Fiber Optic Sensing Technology Center, Wuhan University of Technology, Wuhan 430070, China.
Guang Pu Xue Yu Guang Pu Fen Xi. 2002 Jun;22(3):511-4.
Colloidal gold was prepared by citrate-induced reduction of hydrogen tetrachloroaurate. Gold nanoparticulate thin films were built up using the electrostatic self-assembly technique and characterized by different spectroscopes. The UV-Vis absorbance spectrum indicated that the gold colloid was a monodisperse suspension. The calculation using the Scherrer's equation on base of the X-ray diffraction spectrum indicated that the average size of the gold particles assembled on the substrates was about 21 nm. The X-ray photoelectron spectra showed that the reduction of hydrogen tetrachloroaurate was almost complete and that the gold was present in the thin films largely as Au zero. The X-ray photoelectron spectra also showed that the gold particles were attracted and fixed onto the PDDA-modified substrates by electrostatic forces. The UV-Vis absorbance spectra and the surface enhanced Raman scattering spectra indicated that, arising from the interparticle coupling, the gold nanoparticulate thin films displayed strong collective plasma resonance absorption and sur faced enhanced Raman scattering effect.
通过柠檬酸盐诱导四氯合金酸氢盐还原制备胶体金。采用静电自组装技术制备金纳米颗粒薄膜，并通过不同的光谱仪对其进行表征。紫外可见吸收光谱表明金胶体是单分散悬浮液。基于X射线衍射光谱使用谢乐方程计算表明，组装在基底上的金颗粒的平均尺寸约为21nm。X射线光电子能谱表明四氯合金酸氢盐的还原几乎完全，并且金在薄膜中主要以零价金的形式存在。X射线光电子能谱还表明金颗粒通过静电力被吸引并固定在聚二烯丙基二甲基氯化铵修饰的基底上。紫外可见吸收光谱和表面增强拉曼散射光谱表明，由于颗粒间耦合，金纳米颗粒薄膜表现出强烈的集体等离子体共振吸收和表面增强拉曼散射效应。
