Formation of Bimetallic Au鈥揚d and Au鈥揚t Nanoparticles under Hydrothermal Conditions and Microwave Irradiation

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• 作者：Oleg V. Belousov ; Nataliya V. Belousova ; Anastasia V. Sirotina ; Leonid A. Solovyov ; Anatoly M. Zhyzhaev ; Sergey M. Zharkov ; Yuri L. Mikhlin
• 刊名：Langmuir
• 出版年：2011
• 出版时间：September 20, 2011
• 年：2011
• 卷：27
• 期：18
• 页码：11697-11703
• 全文大小：907K
• 年卷期：v.27,no.18(September 20, 2011)
• ISSN：1520-5827

文摘

The reduction of chlorocomplexes of gold(III) from muriatic solutions by nanocrystal powders of palladium and platinum at 110 and 130 掳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鈥搒hell 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鈥揚d 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.