采用多巴胺化学还原法制备了分散性良好的纳米金溶胶, 并检测了其作为表面增强拉曼散射(Surface Enhanced Raman Scattering, SERS)基底的性质。粒度和透射电子显微镜测试结果表明金溶胶为平均粒径30 nm左右的球形颗粒, 并且紫外-可见特征吸收峰出现在520 nm, 为典型的金纳米颗粒特征吸收峰。以罗丹明6G(R6G)为探针分子证明了金溶胶良好的SERS增强效果, 用金溶胶对除草剂敌草快(DQ)进行检测, 最低检测限可达1×10-7 mol/L。结果表明所制备的金溶胶具有良好的表面增强拉曼散射活性。

Au nanoparticles (NPs) were prepared through chemical reduction using dopamine as the reductant. The NPs were with average size of 30 nm, and UV/V spectroscopy is indicated that the NPs have a typical absorbance peak of Au at 520 nm. The prepared Au NPs exhibit good SERS enhancement using rodamine 6G (R6G) as probe molecule. The Au NPs were used as SERS substrate to detect diquat, and the lowest detection limit could reach 1×10-7 mol/L. The results proved that the Au NPs can be used as active SERS substrates.