银、金溶胶及银/金混合胶体的制备和拉曼增强特性的研究

The Preparation and Surface-Enhanced Raman Scattering Study of Ag Colloid,Au Colloid and Au/Ag Mixed Colloids

以化学还原的方法分别制备了金胶体、银胶体,同时在一种金属核上沉积生长另一种金属制备金银壳结构纳米粒子.通过透射电镜、吸收光谱对其结构及光学性质进行表征.以吡啶为探测分子,考察了其在金溶胶、银溶胶及金包银和银包金等不同溶胶上的拉曼光谱,计算了不同胶体体系上表面增强拉曼谱的增强因子.

Ag-coated Au and Au-coated Ag colloid particles were prepared by deposition of Ag or Au through chemical reduction on Au or Ag colloids,respectively.The obtained colloids were characterized by UV-vis spectroscopy and transmission electron microscopy.Moreover,the activity of these colloids in surface-enhanced Raman spectroscopy（SERS）,that is,the SERS enhancement factor,was checked by using pyridine as an adsorbate probe.