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Please use this identifier to cite or link to this item: http://hdl.handle.net/10119/11435

Title: Spectroscopic study on the charge redistribution between Au and Ag in Au@Ag core-shell nanoparticles
Authors: Nishimura, S.
Anh, D. T. N.
Mott, D.
Ebitani, K.
Maenosono, S.
Keywords: Au@Ag core-shell NPs
electron transfer
charge compensation mechanism
Issue Date: 2012-06
Publisher: Nano Science and Technology Institute
Magazine name: Nanotech 2012
Volume: 1
Start page: 38
End page: 41
Abstract: Charge transfer in Au nanoparticles (NPs) and Au@Ag core-shell NPs synthesized with a wet-chemical reduction method was investigated by X-ray absorption near-edge structure (XANES) and X-ray photoelectron spectroscopy (XPS) techniques. The electron depletion of Au 5d state in the Au@Ag_x NPs compared to Au NPs was ascertained by the XANES analysis in Au L_<2,3>-edges though the Ag thickness (x nm), which affected the hole density of Au 5d states. The order of Au 5d-state hole density was confirmed as Au foil ≅ Au NPs < Au@Ag_x NPs. The positive and negative shifts in the Au 4f and Ag 3d binding energies in XPS spectra of Au@Ag_x NPs compared to Au or Ag NPs suggested that the Ag shell formation strongly contributes to the electron depletion of 5d state in Au atoms of the Au core. According to these results, we concluded that the electron transfer from Au to Ag in the Au@Ag heteromeric NPs followed the charge compensation mechanism.
Rights: © 2012 NSTI http://nsti.org. Reprinted and revised, with permission, from Nanotech 2012, pp. 38-41, June 18-21, 2012, Santa Clara, U.S.A.
URI: http://hdl.handle.net/10119/11435
Material Type: publisher
Appears in Collections:c11-1. 会議発表論文 (Conference Papers)

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