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首页> 外文期刊>The journal of physical chemistry, C. Nanomaterials and interfaces >Substrate Effect on the Refractive Index Sensitivity of Silver Nanoparticles
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Substrate Effect on the Refractive Index Sensitivity of Silver Nanoparticles

机译:基质对银纳米粒子折射率敏感性的影响

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The bulk refractive index (RI) sensitivity of dispersed and immobilized silver nanoparticles of three different shapes (spheres, cubes, and plates) is investigated. We demonstrate, both experimentally and theoretically, that the influence of immobilization on the RI sensitivity is highly dependent on the shape of the nanoparticles. A strong correlation is seen between the fraction of the particle surface area in direct contact with the substrate and the decrease in RI sensitivity when the particles are immobilized on a glass substrate. The largest decrease (—36%) is seen for the most sensitive nanoparticles (plates), drastically reducing their advantage over other nanoparticle shapes. The shape-dependent substrate effect is thus an important factor to consider when designing nanoplasmonic sensors based on colloidal noble-metal nanoparticles.
机译:研究了三种不同形状(球形,立方体和板状)的分散和固定化银纳米颗粒的体折射率(RI)敏感性。我们在实验和理论上都证明固定化对RI敏感性的影响高度取决于纳米颗粒的形状。当将粒子固定在玻璃基板上时,可以看到与基板直接接触的粒子表面积分数与RI灵敏度降低之间存在很强的相关性。对于最敏感的纳米颗粒(板),下降幅度最大(-36%),大大降低了它们相对于其他纳米颗粒形状的优势。因此,在设计基于胶体贵金属纳米粒子的纳米等离子体传感器时,形状相关的衬底效应是要考虑的重要因素。

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