Diffusion of gold ions and gold particles during photoreduction processes probed by the transient grating method

Journal of Colloid and Interface Science
Masafumi HaradaMasahide Terazima

Abstract

The translational diffusion of Au (gold) ions and Au particles during the photoreduction process from AuCl4(-) 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 AuCl4(-) solution before photoirradiation was composed of three contributions; the thermal grating, the species grating due to the creation of AuCl2(-), and that due to the depletion of AuCl4(-). Upon photoirradiation, the species grating signal due to AuCl4(-) 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 AuCl2(-) was concomitant with the formation of Au metal particles. The rapid growth of Au(0) 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 depen...Continue Reading

References

Jul 28, 2004·Journal of Colloid and Interface Science·J YangHeng-Phon Too
Feb 24, 2006·Langmuir : the ACS Journal of Surfaces and Colloids·Masafumi Harada, Hisahiro Einaga
Jul 26, 2006·Langmuir : the ACS Journal of Surfaces and Colloids·Cristina E HoppeM Arturo López-Quintela
Oct 18, 2006·Langmuir : the ACS Journal of Surfaces and Colloids·Masafumi HaradaMasahide Terazima
May 15, 2007·Langmuir : the ACS Journal of Surfaces and Colloids·Masafumi Harada, Hisahiro Einaga

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Citations

Aug 13, 2013·ACS Applied Materials & Interfaces·Jeremy R DunklinD Keith Roper
Dec 8, 2011·Chemphyschem : a European Journal of Chemical Physics and Physical Chemistry·Yuehao LiChalla S S R Kumar
Jan 13, 2010·Journal of Separation Science·Jong-Yeob KimDu-Jeon Jang
Jun 25, 2013·Langmuir : the ACS Journal of Surfaces and Colloids·Tobias Kraus, Niels de Jonge
Dec 21, 2010·Langmuir : the ACS Journal of Surfaces and Colloids·Akihiro MatsubayashiHisashi Ohsaki

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