Raman Spectra of Molecules Adsorbed on Ag Centers in Sol-Gel Matrices |
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Authors: | Krzysztof Maruszewski Marek Jasiorski Dariusz Hreniak Wiesław Stręk Krzysztof Hermanowicz Krystyna Heiman |
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Institution: | Krzysztof Maruszewski, Marek Jasiorski, Dariusz Hreniak, Wiesaw Strk, Krzysztof Hermanowicz and Krystyna Heiman |
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Abstract: | Silica monoliths and submicron spheres containing silver nanoparticles have been obtained using the sol gel technology. The Ag inclusions were synthesized via the counterdiffusion method. The silver-doped matrices were immersed in solutions of an organic dye (indocyanine green) enabling the solute molecules to interact with surface of the Ag-doped silica matrices. Raman spectra of free solutions of the organic molecules under investigation, the impregnated Ag-doped matrices and the impregnated Ag-free matrices have been measured. The impregnated silica matrices which did not contain silver nanoparticles were used as a reference. These experiments have been performed in order to establish if Raman signal enhancement could be obtained by adsorption of organic molecules on the surface of Ag inclusions in the sol-gel matrices analogously to the standard surface-enhanced Raman spectroscopy (SERS) method. |
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Keywords: | Ag nanoparticles submicron silica spheres SERS sol-gel method |
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