Preparation and Characterization of Au_(core)Co_(shell) Nanoparticles and Their Surface-enhanced Raman Spectroscopy
- 化学化工－已发表论文 
AucoreCoshell nanoparticles with different shell thicknesses were prepared by using chemical reduction method and characterized by scanning electron microscopy(SEM) and cyclic voltammetry(CV). The results reveal that the prepared core-shell nanoparticles were covered by Co shell and exhibited the similar electrochemistry property with the Co nanoparticles surface. Surface enhanced Raman spectroscopy(SERS) activities of these nanoparticles were studied by using pyridine as a probe molecule. It was found that the SERS intensity depended on the Co shell thickness of the core-shell nanoparticles and was weakened with the increasing shell thickness. The SERS intensity of these Au_(core)Co_(shell) nanoparticles is found to be about twenty times higher than that obtained on an electrochemically roughened cobalt electrode.