Open AccessX‐ray‐induced reduction of Au ions in an aqueous solution in the presence of support materials and in situ time‐resolved XANES measurements
Author(s) -
Ohkubo Yuji,
Nakagawa Takashi,
Seino Satoshi,
Kugai Junichiro,
Yamamoto Takao A.,
Nitani Hiroaki,
Niwa Yasuhiro
Publication year - 2014
Publication title -
journal of synchrotron radiation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.172
H-Index - 99
ISSN - 1600-5775
DOI - 10.1107/s1600577514012703
Subject(s) - xanes , aqueous solution , synchrotron , ion , carbon fibers , metal ions in aqueous solution , metal , materials science , synchrotron radiation , irradiation , ionic bonding , analytical chemistry (journal) , chemistry , spectral line , inorganic chemistry , organic chemistry , composite number , physics , quantum mechanics , astronomy , nuclear physics , metallurgy , composite material
Synchrotron X‐ray‐induced reduction of Au ions in an aqueous solution with or without support materials is reported. To clarify the process of radiation‐induced reduction of metal ions in aqueous solutions in the presence of carbon particles as support materials, in situ time‐resolved XANES measurements of Au ions were performed under synchrotron X‐ray irradiation. XANES spectra were obtained only when hydrophobic carbon particles were added to the precursor solution containing Au ions. Changes in the shape of the XANES spectra indicated a rapid reduction from ionic to metallic Au in the precursor solution owing to synchrotron X‐ray irradiation. In addition, the effects of the wettability of the carbon particles on the deposited Au metallic spots were examined. The deposited Au metallic spots were different depending on the relationship of surface charges between metal precursors and support materials. Moreover, a Au film was obtained as a by‐product only when hydrophilic carbon particles were added to the precursor solution containing the Au ions.