ANYL 91 |
| SERS substrates consisting of gold nanoparticles deposited on a glass slides are used to examine SERS effect of amino acids; lysine, histidine and aspartic acid. Colloidal films of gold were prepared on glass slides. The slides were derivatized with 3-aminopropyltrimethoxysilane and subsequently reacted with metal colloids for variable time periods. The unique property of the colloidal film is that they have the optical properties of colloidal metal particles and the convenience of solid substrates. The resulting substrates have been characterized by UV-vis spectroscopy which show that collective particle surface plasmon modes are present in ca. 650-750 nm region suggesting that these assemblies are SERS active. Therefore, a method used for enlargement of colloidal gold nanoparticles based on the surface catalyzed reduction of Au3+ by NaBH4. No new particle formation occurs in solution since added Au3+ goes into growth of larger particles. This seeding method will be compared with gold nanoparticles prepared by nanobubble formation in ethanol-water mixture solution. The colloidal films exhibit strong enhancement of Raman scattering from molecules absorbed on the surface. This indeed is the case, with enhancement factors of roughly 104-106 |
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General Papers
7:00 PM-9:00 PM, Sunday, 10 September 2006 Moscone Center -- Hall D, Poster
Division of Analytical Chemistry |