PREPARATION AND CHARACTERIZATION OF COLLOIDAL SILVER PLATINUM ALLOYS

被引：139

作者：

TORIGOE, K

NAKAJIMA, Y

ESUMI, K

机构：

[1] SCI UNIV TOKYO,DEPT APPL CHEM,1-3 KAGURAZAKA,SHINJUKU KU,TOKYO 162,JAPAN

[2] SCI UNIV TOKYO,INST COLLOID & INTERFACE SCI,SHINJUKU KU,TOKYO 162,JAPAN

来源：

JOURNAL OF PHYSICAL CHEMISTRY | 1993年 / 97卷 / 31期

关键词：

D O I：

10.1021/j100133a029

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Colloidal silver-platinum alloys have been prepared by NaBH4 reduction of silver(I) bis(oxalato)platinate(II) (Ag2[Pt(C2O4)2]) in ethylene glycol and characterized by means of EDX, HRTEM, XRD, and optical absorption spectra. The HRTEM micrographs show that the metal particles thus prepared have homogeneous {111} lattice spacing of 2.31 +/- 0.02 angstrom, which is an intermediate value between those of monometallic Ag and Pt colloids, indicating that they are Ag-Pt alloys. The same trend is found in the XRD profiles. Optical spectra of the Ag-Pt alloy colloid show a plasma resonance band at 354 nm. The peak wavelength shifts in the range of 330-410 nm by varying the Ag/Pt ratio. The alloy formation has been studied by step-by-step reduction of Ag2[Pt(C2O4)2]. It is suggested that the reduction of [Pt(C2O4)2]2- takes place by the catalytic action of the Ag particles to form the Ag-Pt alloy.

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页码：8304 / 8309

页数：6

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