Citation: CHEN Xiao-Yu, WANG Jing-Dong, YU An-Chi. Effect of Surrounding Media on Ultrafast Plasmon Dynamics of Gold Nanoparticles[J]. Acta Physico-Chimica Sinica, ;2017, 33(11): 2184-2190. doi: 10.3866/PKU.WHXB201705222 shu

Effect of Surrounding Media on Ultrafast Plasmon Dynamics of Gold Nanoparticles

Department of Chemistry, Renmin University of China, Beijing 100872, P. R. China

Received Date: 26 April 2017
Revised Date: 15 May 2017

Fund Project: The project was supported by the National Natural Science Foundation of China (21373269).

Herein, we prepared four samples, namely gold/poly(sodium-p-styrenesulfonate) (Au/PSS), gold/silicon dioxide (Au/SiO₂), gold/titanium dioxide (Au/TiO₂), and gold/cuprous oxide (Au/Cu₂O) core/shell nanocomposites, to investigate how the surrounding medium affects the ultrafast plasmon dynamics of Au nanoparticles (NPs). We recorded femtosecond transient absorption spectra of Au NPs in Au/PSS, Au/SiO₂, Au/TiO₂, and Au/Cu₂O core/shell nanocomposites at various time delays. We found that the spectral features in the femtosecond transient absorption spectra of Au NPs in Au/TiO₂ and Au/Cu₂O core/shell nanocomposites were dramatically different from those of Au NPs in Au/PSS and Au/SiO₂ core/shell nanocomposites. A comprehensive analysis of the ultrafast plasmon dynamics of Au NPs in the core/shell nanocomposites revealed that following excitation of the resonance plasmon band of Au NPs, the exited electrons could be efficiently transferred into the conduction bands of TiO₂ and Cu₂O in Au/TiO₂ and Au/Cu₂O core/shell nanocomposites.
- Femtosecond transient absorption spectroscopy,
- Plasmon resonance excitation,
- Electron transfer,
- Gold nanoparticle,
- Core/shell structure
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