A Comparative Study of Gold Nanocubes, Octahedra, and Rhombic Dodecahedra as Highly Sensitive SERS Substrates

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• 作者：Hsin-Lun Wu ; Huei-Ru Tsai ; Yun-Ting Hung ; Ka-Un Lao ; Ching-Wen Liao ; Pei-Ju Chung ; Jer-Shing Huang ; I-Chia Chen ; Michael H. Huang
• 刊名：Inorganic Chemistry
• 出版年：2011
• 出版时间：September 5, 2011
• 年：2011
• 卷：50
• 期：17
• 页码：8106-8111
• 全文大小：852K
• 年卷期：v.50,no.17(September 5, 2011)
• ISSN：1520-510X

文摘

Gold nanocubes, octahedra, and rhombic dodecahedra with roughly two sets of particle sizes have been successfully synthesized via a seed-mediated growth approach. All six samples were analyzed for comparative surface-enhanced Raman scattering (SERS) activity. All of these Au nanostructures were found to yield strong enhancement at a thiophenol concentration of 10^鈥? M and are excellent SERS substrates. Rhombic dodecahedra with a rhombus edge length of 32 nm showed significantly better enhancement than the other samples and can reach a detection limit of 10^鈥? M. Simulations of the binding energies of thiophenol on the different faces of gold and electric near-field intensities of these nanocrystals have been performed to evaluate the experimental results. Superior SERS activity of these nanocrystals can be expected toward the detection of many other molecules.