混合正、负电性银胶体系的表面增强拉曼散射活性研究

通过化学还原的方法分别制备了具有正、负电性的纳米银胶 .利用透射电子显微镜表征了正、负电性银胶以及混合银胶体系中加入碱性品红分子后的聚集行为 .通过测定碱性品红分子在正、负电性银胶以及混合银胶体系中的表面增强拉曼光谱的变化 ,探讨了不同电性银胶基底对碱性品红表面增强拉曼活性的影响 .实验结果表明 ,混合溶胶体系所具有的不同于单一溶胶的聚集特性能有效的改善单银胶体系的表面增强拉曼散射活性 .

Surface-enhanced Raman Scattering Activity Study of Molecule in Mixed Negatively and Positively Charged Silver Colloidal Solution

Both negatively and positively charged silver colloids were prepared in aqueous solution for surface-enhanced Raman scattering (SERS) by the reduction of silver nitrate with sodium citrate and hydrogen peroxide under basic condition, respectively. By means of transmission electron microscopy (TEM), the observation of morphologies of negatively charged silver colloid (NSC) and positively charged silver colloid (PSC) has been presented, and the aggregation behaviors of NSC and PSC as well as the mixture of NSC and PSC induced by the addition of fuchsine basic molecules examined. SERS from fuchsine basic molecules in above mentioned colloidal systems were recorded respectively and compared with each other. The results show that the mixture of NSC and PSC could form the aggregation morphology different from that of single NSC and PSC and bring about the favorable effect on SERS behavior for the adsorbed fuchsine basic.