Institute of Chemistry and Chemical Technology of the Russian Academy of Sciences, Krasnoyarsk 660049, Russia.
Langmuir. 2011 Sep 20;27(18):11697-703. doi: 10.1021/la202686x. Epub 2011 Aug 25.
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.
已经研究了在 110 和 130°C 水热条件下和微波辐射的作用下，纳米钯和铂粉末从盐酸溶液中还原金(III)的氯配合物。通过透射电子显微镜、X 射线衍射、X 射线光电子能谱和化学方法对固相的结构和组成进行了表征。揭示了具有核壳结构的双金属颗粒。已经确定，获得的颗粒是由金属还原剂的核组成，该核被钯的取代固溶体（Au，Pd）所覆盖，而在铂的情况下则被金层隔开。这种差异的主要原因是聚集和还原速率之间的比率。以 Au-Pd 体系为例表明，使用微波辐射不仅可以加速颗粒的合成，而且与常规加热相比，可以获得更均匀的材料。
