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.
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