A close look at silver oxide colloid for surface-enhanced Raman scattering |
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Authors: | Xiao Yun Li Ying-Sing Swihart George H |
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Institution: | Department of Chemistry, The University of Memphis, Memphis, TN 38152, USA. |
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Abstract: | A silver oxide hydrosol has been prepared by reacting silver nitrate with sodium hydroxide in an aqueous solution. The colloidal particle composition and particle size have been characterized by X-ray diffractometry and transmittance electron microscopy. We have demonstrated that the sol is surface-enhanced Raman scattering active. One major advantage of this sol is the absence of the spectral interference arising from reaction products of the sol formation process. The mechanism of surface-enhanced Raman scattering activity is essentially contributed by the silver particles generated from the photochemical process during the laser excitation. |
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