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Superstructures and SERS Properties of Gold Nanocrystals with Different Shapes

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  • This work was supported by the National Natural Science Foundation for Distinguished Youth Scholars of China (21025310, Z.Y.T), the National Research Fund for Fundamental Key Project (2009CB930401), the 100-Talent Program of the Chinese Academy of Sciences, and the National Science Foundation of China (20973047). We also thank Prof. Hongxing Xu at the Institute of Physics, Chinese Academy of Sciences for his help with the characterization of optical properties of NC superstructures. SERS=surface-enhanced Raman scattering.

Abstract

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Keeping in shape: The shapes of gold nanocrystals determine their self-assembly behavior—rhombic dodecahedral nanocrystals form triangular multilayers (see picture), whereas cubic and octahedral nanocrystals form monolayers or multilayers without well-defined contours. The three superstructures exhibit different optical properties, and the rhombic dodecahedral gold nanocrystals display strong anisotropic SERS effects.

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