SERS-active Ag/Au bimetallic nanoalloys on Si/SiO_x

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• 作者：Ramon A. Alvarez-Puebla ; Juan P. Bravo-Vasquez ; Pavel Cheben ; Dan-Xia Xu ; Philip Waldron ; Hicham Fenniri
• 关键词：Bimetallic nanoalloys ; Solid thin films ; SERS ; 2-Naphthalenethiol
• 刊名：Journal of Colloid and Interface Science
• 出版年：2009
• 出版时间：1 May 2009
• 年：2009
• 卷：333
• 期：1
• 页码：237-241
• 全文大小：830 K

文摘

Nanoalloys are clusters formed of two or more metallic elements and are of interest for applications in catalysis, spectroscopy, photonics, electronics, and magnetism. The hybridization of the individual plasmonic absorptions of different alloyed metals allows for plasmon tunability and a better coupling of plasmon-excitation line, giving rise to significant increases in the enhancement factor for surface-enhanced Raman scattering (SERS) spectroscopy. Here we report simple fabrication procedures for the preparation of Ag/Au nanoalloys on Si/SiO_x substrates, with tunable plasmon resonances. The mechanism and kinetic of the nanoalloy formation and its optical properties were studied by SEM, XPS, SPR, and SERS.