紫外光引发还原制备金溶胶及其SERS活性的研究  

Preparation of Gold Colloid Induced by Ultraviolet Irradiation and Its Application in SERS

作　　者：阮伟东[1] 吕志成[1] 纪楠[1] 宋薇[1] 周吉[1] 郑先亮[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130012

出　　处：《光散射学报》2005年第4期329-331,共3页The Journal of Light Scattering

基　　金：国家自然科学基金(No.20375014;20473029;20573041)

摘　　要：文章报道了一种用紫外光引发还原制备金溶胶的新方法,其还原过程经历了自由基机理。用紫外可见光谱观察了不同反应时间溶胶状态的变化。结果表明,光照反应2h时明显出现金溶胶粒子,7h后氯金酸基本转化完毕。同时,研究了稳定剂聚乙烯吡咯烷酮(PVP)的加入对还原过程的影响,结果表明,PVP的加入不仅稳定了溶胶,而且降低了反应速率。用SEM观察了溶胶粒子聚集体的形貌。最后以1,4-bis(4-vinylpyridyl)phenylene为探针分子研究了这种溶胶的SERS活性。A gold colloid has been prepared by a UV - photoactivation technique. It is believed that photolytic radicals were formed to catalyzed the reduction procedure. The formation process of the gold colloid was investigated by UV - Vis spectroscopy. The results show that the colloidal particles were formed obviously when the irradiation time was 2 hours and the translation of HAuCI4 was completed when it was 7 hours. We also investigated the stabilizing effect of a polymer stabilizer- Poly（vinylpyrrolidone）. It can not only stabilize the colloidal particles but also slower the reaction velocity. Finally, SERS activity of the colloid was studied using 1, 4- his（4- vinylpyridyl） phenylene as probe molecule. SEM was used to investigate the morphology of the aggregation of colloidal particles.

关 键 词：金溶胶 光还原 表面增强拉曼光谱 

分 类 号：O657.37[理学—分析化学]