Optical Properties of Au-Ag Nanoboxes Studied by Single Nanoparticle Spectroscopy
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- 作者：Min Hu ; Hristina Petrova ; Andrew R. Sekkinen ; Jingyi Chen ; Joseph M. McLellan ; Zhi-Yuan Li ; Manuel Marquez ; Xingde Li ; Younan Xia ; Gregory V. Hartland
- 刊名：Journal of Physical Chemistry B
- 出版年：2006
- 出版时间：October 12, 2006
- 年：2006
- 卷：110
- 期：40
- 页码：19923 - 19928
- 全文大小：191K
- 年卷期：v.110,no.40(October 12, 2006)
- ISSN：1520-5207
文摘
The optical properties of two Au-Ag nanobox samples with average edge lengths of 44 and 58 nm and wallthicknesses of 6 and 8 nm, respectively, have been studied by single particle spectroscopy. The measurementsgave an average line width of 
= 306 ± 7 meV with a standard deviation of 
= 30 meV for the 44-nmboxes, and = 350 ± 9 meV with = 35 meV for the 58-nm boxes. These line widths are much broaderthan those of gold nanorods with comparable resonance energies. The increased broadening is attributed toa combination of surface scattering of electrons, as well as increased radiation damping for the nanoboxes.Discrete dipole approximation calculations have been performed with and without surface scattering of electronsto compare with the experimental spectra. The calculations confirm that both electron-surface scattering andradiation damping are important effects in this system.
= 306 ± 7 meV with a standard deviation of = 30 meV for the 44-nmboxes, and = 350 ± 9 meV with = 35 meV for the 58-nm boxes. These line widths are much broaderthan those of gold nanorods with comparable resonance energies. The increased broadening is attributed toa combination of surface scattering of electrons, as well as increased radiation damping for the nanoboxes.Discrete dipole approximation calculations have been performed with and without surface scattering of electronsto compare with the experimental spectra. The calculations confirm that both electron-surface scattering andradiation damping are important effects in this system.