Scattering and Absorption Cross-Section Spectral Measurements of Gold Nanorods in Water
Scattering and Absorption Cross-Section Spectral Measurements of Gold Nanorods in Water
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DOI：
10.1021/jp907811g
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发表时间：
2010-02-25
影响因子：
3.7
通讯作者：
Prasad, P. N.
中科院分区：
文献类型：
--
作者：
He, Guang S.;Zhu, Jing;Prasad, P. N.
通常测量的衰减（消光）光谱的金纳米棒在水中包括两个无法分辨的贡献：吸收和散射。本研究是通过测量总散射损耗作为波长的函数来分离这两种贡献。已知总衰减谱和散射损失谱，就可以确定出给定样品系统的纯吸收谱。采用两种方法对纯散射损失进行了实验测量：一种是利用标定后的大面积光电探测器沿沿着一定立体角收集散射能量进行直接测量;另一种是利用水中的聚苯乙烯微球作为散射截面已知的标准样品进行比较测量。这两种方法给出了几乎相同的结果，并与理论计算结果进行了比较。
The usually measured attenuation (extinction) spectra of gold nanorods in water include two unresolving contributions: absorption and scattering. The present Study is to separate these two contributions by measuring the total scattering losses as,I function of wavelengths. Knowing the total-attenuation spectrum and the scattering-loss spectrum, the pure absorption spectrum call be finally determined for I given sample system. Two approaches are employed for experimentally estimating the pure scattering losses: one is direct measurement using a calibrated large-area photodetector to collect the scattered energy along a certain solid angle; the other is comparison measurement by using polystyrene microspheres in water as a standard sample whose scattering cross section is known well. These two methods have given nearly the same results and are finally compared with the theoretical calculations.