Hydrogen-Mediated Electron Doping of Gold Clusters As Revealed by In Situ X-ray and UV-vis Absorption Spectroscopy

Ryo Ishida; Shun Hayashi; Seiji Yamazoe; Kazuo Kato; Tatsuya Tsukuda

doi:10.1021/acs.jpclett.7b00722

Hydrogen-Mediated Electron Doping of Gold Clusters As Revealed by In Situ X-ray and UV-vis Absorption Spectroscopy

J Phys Chem Lett. 2017 Jun 1;8(11):2368-2372. doi: 10.1021/acs.jpclett.7b00722. Epub 2017 May 13.

Authors

Ryo Ishida¹, Shun Hayashi¹, Seiji Yamazoe^{1

2}, Kazuo Kato³, Tatsuya Tsukuda^{1

2}

Affiliations

¹ Department of Chemistry, School of Science, The University of Tokyo , 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan.
² Elements Strategy Initiative for Catalysts and Batteries (ESICB), Kyoto University , Katsura, Kyoto 615-8520, Japan.
³ Japan Synchrotron Radiation Research Institute , SPring-8, 1-1-1 Koto, Sayo, Hyogo 679-5198, Japan.

PMID: 28459582
DOI: 10.1021/acs.jpclett.7b00722

Abstract

We previously reported that small (∼1.2 nm) gold clusters stabilized by poly(N-vinyl-2-pyrrolidone) (Au:PVP) exhibited a localized surface plasmon resonance (LSPR) band at ∼520 nm in the presence of NaBH₄. To reveal the mechanism of this phenomenon, the electronic structure of Au:PVP during the reaction with NaBH₄ in air was examined by means of in situ X-ray absorption spectroscopy at Au L₃-edge and UV-vis spectroscopy. These measurements indicated that the appearance of the LSPR band is not associated with the growth in size but is ascribed to electron doping to the Au sp band by the adsorbed H atoms.