title: Formation of bimetallic Au-Pd and Au-Pt nanoparticles under hydrothermal conditions and microwave irradiation.
abstract: The reduction of chlorocomplexes of gold(III) from muriatic solutions by nanocrystal powders of palladium and platinum at 110 and 130 °C under hydrothermal conditions and the action of microwave irradiation has been investigated. The structure and composition of the solid phase have been characterized by transmission electron microscopy, X-ray diffraction, X-ray photoelectron spectroscopy, and chemical methods. Bimetallic particles with a core-shell structure have been revealed. The obtained particles are established to have a core of the metal reductant covered with a substitutional solid (Au, Pd) solution in case of palladium, and isolated by a gold layer in the case of platinum. The main reason for such a difference is the ratio between the rates of aggregation and reduction. It has been shown by the example of the Au-Pd system that the use of microwave irradiation allows us not only to accelerate the synthesis of particles but also to obtain more homogeneous materials in comparison with conventional heating.
authors.affiliation: Institute of Chemistry and Chemical Technology of the Russian Academy of Sciences, Krasnoyarsk 660049, Russia. ov_bel@icct.ru
authors.forename: Oleg V
authors.initials: OV
authors.lastname: Belousov
authors.forename: Nataliya V
authors.initials: NV
authors.lastname: Belousova
authors.forename: Anastasia V
authors.initials: AV
authors.lastname: Sirotina
authors.forename: Leonid A
authors.initials: LA
authors.lastname: Solovyov
authors.forename: Anatoly M
authors.initials: AM
authors.lastname: Zhyzhaev
authors.forename: Sergey M
authors.initials: SM
authors.lastname: Zharkov
authors.forename: Yuri L
authors.initials: YL
authors.lastname: Mikhlin