Role of substrate metal in gold nanoparticle enhanced surface plasmon resonance imaging

被引:113
作者
Hutter, E
Cha, S
Liu, JF
Park, J
Yi, J
Fendler, JH
Roy, D
机构
[1] Clarkson Univ, Ctr Adv Mat Proc, Potsdam, NY 13699 USA
[2] Clarkson Univ, Dept Phys, Potsdam, NY 13699 USA
[3] Seoul Natl Univ, Sch Chem Engn, Environm Mat & Proc Lab, Seoul 151744, South Korea
关键词
D O I
10.1021/jp003565q
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Using Au nanoparticles, it is possible under certain experimental conditions to considerably enhance the sensitivity of a conventional surface plasmon resonance (SPR) device. In this report, we examine the mechanism of this enhancement and discuss the experimental factors that are crucial to the performance of such a nanoparticle based SPR device. Among these factors, the surface plasmon-supporting metal substrate plays a major role. We demonstrate this by comparing experimental SPR data for Au and Ag substrates. In both cases, similar to 25-30 nm diameter Au particles are attached to the substrate metal via a sandwiched monolayer of 1,6-hexanedithiol. The width and the efficiency of SPR for both substrates are affected by the Au particles. However, the particle-induced shift in the SPR angle is observed only for the Au substrate. This observation is explained in terms of competitive effects of propagating surface plasmons in the substrate metal and localized surface plasmons in the Au nanoparticles.
引用
收藏
页码:8 / 12
页数:5
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