一种新型银溶胶的制备、表征及其SERS活性的研究  

A New Silver Colloid-Preparation, Morphology and SERS Activity

作　　者：李小灵[1] 贾慧颖[1] 徐蔚青[1] 张俊虎[1] 赵冰[1] 

机构地区：[1]吉林大学超分子结构与材料教育部重点实验室,长春130021

出　　处：《光散射学报》2004年第1期27-30,共4页The Journal of Light Scattering

基　　金：国家自然科学基金资助项目(批准号:20273022;20173019;20375014)

摘　　要：报道了用一种化学还原方法制备银溶胶的新方法。用紫外-可见光谱和透射电镜研究银纳米粒子的形成过程,粒子形状及粒径分布。结果表明,在反应初期形成球形和棒状两种形状的银纳米粒子,随着反应的进行,大部分的棒状粒子逐渐变为球形粒子,最终棒状粒子少于银纳米粒子总数的3%。因此,最终得到了一种形状均一的,平均粒径为17nm银纳米粒子。同时也用紫外-可见光谱研究了Cl-的加入对这种银纳米粒子光谱性质的影响,结果表明Cl-加速了银纳米粒子的聚集。这种银溶胶有着较高的SERS活性。A new silver colloid with diameter of about 17nm were prepared by a simple chemical reaction. The formation process of the silver nanoparticles was studied by UV-Vis spectroscopy and TEM. The results show that the spherical and rod-like particles were gradually converted into spherical particles following with the reaction. Finally, the content of the rod-like particles was less than 3% in the silver colloid. Thus, the finally obtained silver nanoparticles are uniform in shape and showed little variation in size. We also investigated the effect of Cl^- ions on the rate of changes in the optical properties of the silver colloid by UV-Vis absorption .The results indicate that Cl^- ions accelerate the aggregation of the nanoparticles . This silver colloid can serve as SERS-active substrates.

关 键 词：银溶胶 表面增强拉曼散射 银纳米粒子 粒径分布 SERS活性 表面分子 溶胶制备 

分 类 号：O657.37[理学—分析化学]