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Preparation of gold nanoparticles included in anatase‐phase titania by solution plasma method
Author(s) -
Mizutani Tsuyoshi,
Murai Takaaki,
Nomoto Toyokazu,
Nameki Hirofumi,
Yoshida Tomoko,
Yagi Shinya
Publication year - 2014
Publication title -
surface and interface analysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.52
H-Index - 90
eISSN - 1096-9918
pISSN - 0142-2421
DOI - 10.1002/sia.5567
Subject(s) - anatase , x ray photoelectron spectroscopy , colloidal gold , materials science , nanoparticle , surface plasmon resonance , chemical engineering , nanocrystalline material , photocatalysis , absorption spectroscopy , absorption edge , calcination , nanotechnology , analytical chemistry (journal) , catalysis , chemistry , band gap , organic chemistry , optics , physics , engineering , optoelectronics
The gold nanoparticles on titania support (AuNP/TiO 2 ) has been paid attention as a catalyst and a photocatalyst. We perform the preparation of AuNP/TiO 2 , which is the combination of the sol–gel method and solution plasma method. In this method, we generate the plasma in the gelatinous peroxotitanic acid solution by the discharge between the gold electrodes, and then we synthesize the peroxotitanium gel containing gold nanoparticles. After drying and calcination process, we obtain the AuNP/TiO 2 samples. The X‐ray diffraction results show that the AuNP/TiO 2 is constituted by the nanocrystalline gold and anatase‐phase TiO 2 , and the lattice constant decreases by the embedded gold nanoparticles in the TiO 2 matrix. Ultraviolet–Visible absorption spectroscopy shows that the AuNP/TiO 2 samples absorb the visible light at about 630 nm based on the localized surface plasmon resonance of gold nanoparticles embedded in the TiO 2 matrix. The surface chemical states of the AuNP/TiO 2 samples are analyzed by the X‐ray photoelectron spectroscopy. The surface of AuNP/TiO 2 is composed with the majority of oxidized gold and minority of metallic gold which interacted with the TiO 2 surface. The Au L 3 ‐edge near edge X‐ray absorption fine structure spectra indicate that the gold nanoparticles embedded in TiO 2 have metallic chemical states. We successfully prepare the gold nanoparticles on the surface and in the matrix of anatase‐phase TiO 2 . Copyright © 2014 John Wiley & Sons, Ltd.