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9 February 2005 Surface-enhanced Raman scattering of biological molecules on mixed metal colloids
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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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Jinghuai Fang, Yuan Li, Yanyun Jin, Hongbing Li, and Hengjing Yang "Surface-enhanced Raman scattering of biological molecules on mixed metal colloids", Proc. SPIE 5635, Nanophotonics, Nanostructure, and Nanometrology, (9 February 2005); doi: 10.1117/12.577731;

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