Silver nanowire layer-by-layer films as substrates for surface-enhanced Raman scattering

被引:119
作者
Aroca, RF [1 ]
Goulet, PJG
dos Santos, DS
Alvarez-Puebla, RA
Oliveira, ON
机构
[1] Univ Windsor, Dept Chem & Biochem, Mat & Surface Sci Grp, Windsor, ON N9B 3P4, Canada
[2] Inst Fis Sao Carlos, BR-13560970 Sao Carlos, SP, Brazil
关键词
D O I
10.1021/ac048806v
中图分类号
O65 [分析化学];
学科分类号
070302 ; 081704 ;
摘要
In this paper, the fabrication of highly stable, surface-enhanced Raman scattering (SERS) active dendrimer/silver nanowire layer-by-layer (LBL) films is reported. Ag nano,wires, similar to100 nm in diameter, were produced in solution and transferred, using the LBL technique, onto a single fifth-generation DAB-Am dendrimer layer on a glass substrate. The Ag nanowires, and the resulting LBL films were characterized using UV-visible surface plasmon absorbance, while the LBL films were further characterized by atomic force microscopy measurements and surface-enhanced Raman and resonance Raman scattering of several analytes. The dendrimer was found to effectively immobilize the Ag nanowires with increased control over spacing and aggregation of the particles. These films are shown to be excellent substrates for SERS/SERRS measurements, demonstrating significant enhancement, and trace detection capability. Several trial analytes were tested using a variety of excitation energies, and results confirmed effective enhancement of Raman signals throughout the visible range (442-785 nm) with different molecules. Analytes were deposited onto the enhancing Ag nanowire LBL films surface using both casting and Langmuir-Blodgett monolayer transferring techniques.
引用
收藏
页码:378 / 382
页数:5
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