PVP在水相金纳米粒子表面吸附过程的研究

Coating Process of PVP Layer on Nearly Monodisperse Aqueous Dispersions of Gold Nanoparticles

运用紫外可见吸收光谱,在水相金溶胶体系中研究了聚乙烯吡咯烷酮(PVP)在金纳米粒子表面的吸附。实验结果表明:PVP吸附在金纳米粒子的表面,使金纳米粒子的特征吸收峰的峰位红移15nm左右且强度下降。根据金溶胶中PVP加入量和特征吸收峰的变化,提出了PVP对溶胶中金纳米粒子的表面包裹经过的过程。

The coating process of the poly（vinyl-pyrrolidone） （PVP） layer on nearly monodisperse aqueous dispersions of gold nanoparticles was studied by UV-Vis absorption spectroscopy. The ob- tained results demonstrated that the position of the absorption peak of the gold nanoparticles had a redshift of 15nm when PVP was adsorbed on the surface of the gold nanoparticles. A possible mecha- nism of the coating process of the PVP molecules on nearly monodisperse aqueous dispersions of gold nanoparticles was proposed on the basis of the amount of PVP added in the gold colloid and the shift of absorption peak.