Preparation, Characterization and Surface-enhanced Raman Scattering Activities of Cap-shaped Gold Nanostructures

Abstract

Abstract:

Cap-shaped gold nanostructures, consisting of a SiO₂ core with a Au cap, were prepared with vacuum ion sputtering by depositing Au films onto the surface of self-assembled monolayer arrays of SiO₂ nanoparticles. Their surface morphologies, structures, and optical properties were characterized via TEM, SEM, AFM, XRD, and UV-Vis-NIR spectrophotometer. The surface-enhanced Raman scattering(SERS) activities of gold nanocaps were investigated with methylene blue as a probe molecule. The Raman scattering signal of the adsorbed molecule was found to be enhanced remarkably, and an enhancement factor of the order of 10⁷ was estimated, which indicated that they are potentially useful for ultrasensitive biological and chemical detection.

Key words: SiO₂ nanoparticles, Cap-shaped gold nanostructure, Surface plasmon resonance, Methylene blue, Surface-enhanced Raman scattering

TrendMD:

XIAO Gui-Na, MAN Shi-Qing*. Preparation, Characterization and Surface-enhanced Raman Scattering Activities of Cap-shaped Gold Nanostructures[J]. Chem. J. Chinese Universities, 2009, 30(5): 849.

References

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