Comparison of Plasmonic Sensing between Polymer- and Silica-coated Gold Nanorods
Comparison of Plasmonic Sensing between Polymer- and Silica-coated Gold Nanorods
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DOI：
10.2116/analsci.25.255
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发表时间：
2009-02-01
影响因子：
1.6
通讯作者：
Yamada, Sunao
中科院分区：
文献类型：
--
作者：
Omura, Naoya;Uechi, Ichiro;Yamada, Sunao
金纳米棒（AuNR）是一种棒状金纳米颗粒，基于表面等离子体激元的纵向振荡模式，在近红外区域显示出强等离子体激元带。在这项研究中，我们用二氧化硅或聚（4-苯乙烯磺酸钠）（PSS）涂覆AuNR，以评估表面修饰作为AuNR传感探针材料的效果。通过静电逐层吸附，在玻璃基板上成功制备了 PSS 涂层 AuNR 的多层组件，并分析了它们的等离子体能带分布与折射率的函数关系。分布图显示出与折射率令人满意的线性响应。研究了二氧化硅层厚度对等离子体激元带移动随周围介质折射率的影响，以及二氧化硅涂层对 AuNR 热稳定性的影响。还研究了二氧化硅包覆的 AuNR 的热稳定性。对上述两种涂层方法进行了比较。
Gold nanorods (AuNRs), rod-like gold nanoparticles, show strong plasmon bands in the near-infrared region, based on the longitudinal oscillation mode of surface plasmons. In this research, we have coated AuNRs with silica or poly(sodium 4-styrenesulfonate) (PSS) in order to evaluate the effects of surface modifications as a sensing probe material of AuNR. Multilayered assemblies of the PSS-coated AuNRs have been successfully fabricated on the glass substrate by electrostatic layer-by-layer adsorption, and their plasmonic band profiles have been analyzed as a function of refractive index. The profiles showed satisfactory linear responses with the refractive indices. The effect of the thickness of silica layer on the shift of plasmon band with refractive index of the surrounding media has been investigated, along with, the effect of silica coating on the thermal stability of AuNR. The thermal stability of the silica-coated AuNR has also been investigated. The two types of the above-described coating approaches have been compared.