Abstract
Positively charged silver colloid and negatively gold colloid were prepared in aqueous solution for surface-enhanced Raman scattering (SERS) by the chemical reduction of metallic ions in aqueous solution with sodium borohydride solution in ice-cooled condition, respectively. SERS from glycine molecules in above mentioned colloidal systems were recorded respectively and compared with each other. The results show that the mixture of silver and gold colloids could form aggregation different from that of single silver colloid and gold colloid and bring about the favorable effect on SERS behavior for adsorbed glycine.
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