Scattering and Absorption Cross-Section Spectral Measurements of Gold Nanorods in Water

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 a function of wavelengths. Knowing the total-attenuat...

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Bibliographic Details
Published in:Journal of physical chemistry. C 2010-02, Vol.114 (7), p.2853-2860
Main Authors: He, Guang S, Zhu, Jing, Yong, Ken-Tye, Baev, Alexander, Cai, Hong-Xing, Hu, Rui, Cui, Yiping, Zhang, Xi-He, Prasad, P. N
Format: Article
Language:English
Subjects:
C: Nanops and Nanostructures
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Summary: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 a function of wavelengths. Knowing the total-attenuation spectrum and the scattering-loss spectrum, the pure absorption spectrum can be finally determined for a 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.
ISSN:1932-7447
1932-7455
DOI:10.1021/jp907811g