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首页> 外文期刊>The journal of physical chemistry, B. Condensed matter, materials, surfaces, interfaces & biophysical >Role of Substrate Metal in Gold Nanoparticle Enhanced Surface Plasmon Resonance Imaging
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Role of Substrate Metal in Gold Nanoparticle Enhanced Surface Plasmon Resonance Imaging

机译:基质金属在金纳米粒子增强的表面等离子体共振成像中的作用

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Using Au nanoparticles, it is possible under certain experimental conditions to considerably enhance the sensitivity of a conventional surface palsmon resonance (SPR) device. In this report, we examine the mechanism of thsi 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, aprox 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 lcoalized surface plasmons in the Au nanoparticles.
机译:使用Au纳米颗粒,有可能在某些实验条件下显着提高常规表面等离子体共振(SPR)设备的灵敏度。在这份报告中,我们研究了这种增强作用的机理,并讨论了对这种基于纳米颗粒的SPR装置的性能至关重要的实验因素。在这些因素中,表面等离激元支撑金属基底起主要作用。我们通过比较Au和Ag衬底的实验SPR数据来证明这一点。在这两种情况下,约25-30 nm直径的aprox Au粒子都通过1,6-己二硫醇的夹层单层附着到基底金属上。两种基材的SPR宽度和效率都受到Au颗粒的影响。但是,仅在Au基板上观察到了颗粒引起的SPR角偏移。根据在基底金属中传播的表面等离子体激元和在Au纳米颗粒中的渗铝表面等离子体激元的竞争效应来解释该观察结果。

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