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
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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.
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