Two-color surface plasmon resonance nanosizer for gold nanoparticles.
Two-color surface plasmon resonance nanosizer for gold nanoparticles.
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DOI：
10.1364/oe.27.003200
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发表时间：
2019-02
期刊：
影响因子：
3.8
通讯作者：
Quaid Zaman;J. Souza;O. Pandoli;K. Costa;V. Dmitriev;D. Fulvio;M. Cremona;R. Aucélio;Giselle Fontes;T. Del Rosso
中科院分区：
文献类型：
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作者：
Quaid Zaman;J. Souza;O. Pandoli;K. Costa;V. Dmitriev;D. Fulvio;M. Cremona;R. Aucélio;Giselle Fontes;T. Del Rosso
我们研究了双色表面等离子体共振（SPR）光谱纳米粒度仪的潜力，通过监测柠檬酸盐稳定的金纳米粒子（AuNPs）在SiO2表面上的胶体分散体的组装。当金纳米粒子/水复合物的光密度层可以忽略，并且在金纳米粒子的介电常数公式中考虑了电子平均自由程的限制时，在麦克斯韦的加内特理论的背景下，可以通过使用双色SPR光谱直接确定纳米粒子阵列的表面密度σ和纳米粒子的统计平均尺寸。基于单个纳米颗粒的消光截面σext与表面密度σ之间的简单比例关系，对于标称平均直径为15 nm的AuNP实验证明的光学方法理论上可以扩展到更大的纳米颗粒。实验结果，通过AFM，透射电子显微镜和动态光散射技术所获得的，建立一个新的见解SPR光谱的潜力，准确地表征纳米材料。
We study the potentialities of a two-color Surface Plasmon Resonance (SPR) spectroscopy nanosizer by monitoring the assembling of a colloidal dispersion of citrate stabilized gold nanoparticles (AuNPs) on SiO2 surface. When the AuNPs/water composite's optical density layer is negligible and the electron mean-free path limitation is taken into account in the AuNPs' dielectric constant;s formulation, the surface density σ of the nanoparticle array and the statistical mean size of the nanoparticles can be straightly determined by using two-color SPR spectroscopy in the context of Maxwell's Garnett theory. The optical method, demonstrated experimentally for AuNPs with a nominal mean diameter of 15 nm, can, theoretically, be extended to bigger nanoparticles, based on a simple scaling relation between the extinction cross section of the single nanoparticle σext and the surface density σ. The experimental results, comparable to those obtained by AFM, transmission electron microscopy and dynamic light scattering technique, establish a novel insight on the SPR spectroscopy's potential to accurately characterize nanomaterials.