硅/二氧化硅（Si/SiO(x)）上的表面增强拉曼散射（SERS）活性银/金双金属纳米合金

SERS-active Ag/Au bimetallic nanoalloys on Si/SiO(x).

作者信息

Alvarez-Puebla Ramon A, Bravo-Vasquez Juan P, Cheben Pavel, Xu Dan-Xia, Waldron Philip, Fenniri Hicham

机构信息

National Institute for Nanotechnology, National Research Council, University of Alberta, 11421 Saskatchewan Drive Edmonton, Alberta T6G 2M9, Canada.

出版信息

J Colloid Interface Sci. 2009 May 1;333(1):237-41. doi: 10.1016/j.jcis.2009.01.070. Epub 2009 Feb 7.

DOI:10.1016/j.jcis.2009.01.070

PMID:19251268

Abstract

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.

摘要

纳米合金是由两种或更多种金属元素形成的团簇，在催化、光谱学、光子学、电子学和磁学等应用领域具有重要意义。不同合金化金属的各个等离子体吸收的杂化使得等离子体具有可调谐性，并能更好地耦合等离子体激发线，从而显著提高表面增强拉曼散射（SERS）光谱的增强因子。在此，我们报告了在Si/SiO(x)衬底上制备具有可调谐等离子体共振的Ag/Au纳米合金的简单制造工艺。通过扫描电子显微镜（SEM）、X射线光电子能谱（XPS）、表面等离子体共振（SPR）和表面增强拉曼散射（SERS）研究了纳米合金形成的机理、动力学及其光学性质。