氯离子对银胶的宽波段光吸收光谱的影响

本文借助紫外-可见-近红外吸收光谱、透射电子显微镜技术,研究灰银胶中加入氯离子后此体系的宽波段吸收光谱的变化,旨在探索氯离子对纳米银颗粒表面特性的影响。实验结果表明,氯离子的加入会引起胶体中银颗粒的凝聚和银纳米颗粒的聚集体形态的变化,造成银颗粒的本征吸收光谱的"蓝移"和近红外区新吸收带的出现。最后我们初步分析了此现象产生的机制。

The Influence of the Chlorine Anion on the UV-Visible-NIR Absorption Spectra of Silver Colloid

The changing of chlorine anion to the gray silver colloid was investigated in this paper with UV-Visible——NIR absorption spectra and transmission electron microscopy.It can be found that a new absorption band emerged in the near infrared;the position of characteristic peak has been shifted in shortwave to some extent.At the same time,with the help of transmission electron micrograph images,it is indicate that: the morphology of silver particles changes by adding chlorine anions into the gray silver colloid.It can be deduced probable mechanism in the process.