原位X射线和紫外可见吸收光谱揭示的金团簇的氢介导电子掺杂

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

作者信息

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

机构信息

Department of Chemistry, School of Science, The University of Tokyo , 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan.

Elements Strategy Initiative for Catalysts and Batteries (ESICB), Kyoto University , Katsura, Kyoto 615-8520, Japan.

出版信息

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

DOI:10.1021/acs.jpclett.7b00722

PMID:28459582

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 NaBH. To reveal the mechanism of this phenomenon, the electronic structure of Au:PVP during the reaction with NaBH in air was examined by means of in situ X-ray absorption spectroscopy at Au L-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.

摘要

我们之前报道过，由聚（N-乙烯基-2-吡咯烷酮）（Au:PVP）稳定的小尺寸（约1.2纳米）金簇在硼氢化钠存在下于约520纳米处呈现出局域表面等离子体共振（LSPR）带。为揭示这一现象的机制，通过金L边的原位X射线吸收光谱和紫外-可见光谱研究了Au:PVP在空气中与硼氢化钠反应过程中的电子结构。这些测量表明，LSPR带的出现与尺寸增长无关，而是归因于吸附的氢原子对金sp带的电子掺杂。