Synthesis and characterization of Pt–Cu bimetallic alloy nanoparticles by reverse micelles method

• Published in: Colloids and surfaces. A, Physicochemical and engineering aspects Vol. 273; no. 1; pp. 35 - 42
• Main Authors: Weihua, Wang, Xuelin, Tian, Kai, Chen, Gengyu, Cao
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 01-02-2006; Elsevier
• Subjects: Bimetallic nanoparticles; Chemistry; Colloidal state and disperse state; CTAB; Exact sciences and technology; General and physical chemistry; Micelles. Thin films; Physical and chemical studies. Granulometry. Electrokinetic phenomena; Pt/Cu; Water-in-oil; Pt/Cu; Bimetallic nanoparticles; CTAB; Water-in-oil; Water; Nanoparticle; Alloys; Cationic surfactant; Ionic surfactant; Quaternary ammonium compound; Characterization; Oil; Synthesis; Reverse micelle
• ISSN: 0927-7757; 1873-4359
• DOI: 10.1016/j.colsurfa.2005.07.029

Platinum–copper bimetallic alloy nanoparticles were synthesized in water-in-oil (w/o) microemulsions of water/cetyltrimethyammonium bromide (CTAB)/isooctane/
n-butanol by the co-reduction of H
2PtCl
6 and CuCl
2 with hydrazine at room temperature. The samples were characterized by high-resolution transmission electron microscopy (HRTEM), X-ray diffraction (XRD) and X-ray photoelectron spectrum (XPS). XRD results show that there is only one peak in the pattern of bimetallic nanoparticles, corresponding to the (1
1
1) plane of the PtCu
3 bulk alloy. XPS illustrates that both elements in the nanoparticles are in zero-valence and possess the characteristic metallic binding energy. HRTEM analyses confirm the formation of the PtCu
3 alloy nanoparticles with a mean diameter of about 1.6
nm, where the corresponding lattice spacing of 1.87
Å is consistent with that of the (2
0
0) plane of PtCu
3 bulk alloy. Moreover, the factors influencing the size of PtCu
3 nanoparticles had also been investigated and discussed.