TY - JOUR
T1 - Diffusion of gold ions and gold particles during photoreduction processes probed by the transient grating method
AU - Harada, Masafumi
AU - Okamoto, Koichi
AU - Terazima, Masahide
N1 - Funding Information:
We are grateful to the valuable discussions to Prof. H. Einaga at Department of Energy and Material Sciences, Faculty of Engineering Sciences, Kyushu University, Japan. One of the authors (K.O.) acknowledges support from JST PRESTO.
Copyright:
Copyright 2018 Elsevier B.V., All rights reserved.
PY - 2009/4/15
Y1 - 2009/4/15
N2 - The translational diffusion of Au (gold) ions and Au particles during the photoreduction process from AuCl- 4 to metallic Au particles in aqueous ethanol solutions containing poly(N-vinyl-2-pyrrolidone) was investigated by using UV-vis absorption and the laser-induced transient grating (TG) methods. The TG signal of AuCl- 4 solution before photoirradiation was composed of three contributions; the thermal grating, the species grating due to the creation of AuCl- 2, and that due to the depletion of AuCl- 4. Upon photoirradiation, the species grating signal due to AuCl- 4 diminished rapidly and the TG signal due to Au particles appeared within a few minutes and became stronger at a very short time. The subsequent reduction of AuCl- 2 was concomitant with the formation of Au metal particles. The rapid growth of Au0 atoms into Au particles took place in the short-duration photoirradiation. With the increase of the photoirradiation time, the TG signal was composed of two kinds of Au particle fragments possessing different diffusion coefficients. This is probably due to the pulse-laser induced fragmentation of the larger Au particles. Effects of the polymer on the particle formation were investigated by the concentration dependence of the polymer in the solution. The formation of Au particles by the photoreduction was also compared with that of Pt particles.
AB - The translational diffusion of Au (gold) ions and Au particles during the photoreduction process from AuCl- 4 to metallic Au particles in aqueous ethanol solutions containing poly(N-vinyl-2-pyrrolidone) was investigated by using UV-vis absorption and the laser-induced transient grating (TG) methods. The TG signal of AuCl- 4 solution before photoirradiation was composed of three contributions; the thermal grating, the species grating due to the creation of AuCl- 2, and that due to the depletion of AuCl- 4. Upon photoirradiation, the species grating signal due to AuCl- 4 diminished rapidly and the TG signal due to Au particles appeared within a few minutes and became stronger at a very short time. The subsequent reduction of AuCl- 2 was concomitant with the formation of Au metal particles. The rapid growth of Au0 atoms into Au particles took place in the short-duration photoirradiation. With the increase of the photoirradiation time, the TG signal was composed of two kinds of Au particle fragments possessing different diffusion coefficients. This is probably due to the pulse-laser induced fragmentation of the larger Au particles. Effects of the polymer on the particle formation were investigated by the concentration dependence of the polymer in the solution. The formation of Au particles by the photoreduction was also compared with that of Pt particles.
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U2 - 10.1016/j.jcis.2008.12.041
DO - 10.1016/j.jcis.2008.12.041
M3 - Article
C2 - 19150075
AN - SCOPUS:60249088446
SN - 0021-9797
VL - 332
SP - 373
EP - 381
JO - Journal of Colloid And Interface Science
JF - Journal of Colloid And Interface Science
IS - 2
ER -