Controllable Extinction Property of Au/SiO₂ Nanocomposite Induced by Neutralization Reaction Time

Abstract:

The Au/SiO₂ nanocomposite was produced using surface active agent P123, and its optical absorption spectra was measured by spectrophotometer. It was found that the intensity of absorption peak was strengthened and underwent a red-shift as the neutralization reaction time extended. The variation of optical extinction property of one gold particle (GP) with different size had been investigated by Mie theory. It was found that the extinction property of the single spherical GP possessed an obvious size effect. The extinction property of Au/SiO₂ nanocomposite had been analyzed by Maxwell-Garnett (MG) theory. It showed that the extinction peak underwent a red-shift and the extinction intensity was strengthened when the size of gold nanoparticles (GNs) increased. The theoretical and the experimental results show that the extinction property of Au/SiO₂ nanocomposite changes because the scattering effect of GNs are strengthened when their sizes increased by controlling the neutralization reaction time.

• Periodical: Advanced Materials Research (Volumes 233-235)
• Pages: 2023-2028
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.233-235.2023
• Online since: May 2011
• Authors: Jing Yue Fang, Xue Ao Zhang, Shi Qiao Qin, Fei Wang, Xin Hua Li, Sheng Li Chang
• Keywords: Au/SiO₂ nanocomposite, Extinction Property, Maxwell-Garnett Theory, Mie Theory

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