Synthesis And Characterization Of Platinum Nanoparticles

Considerable attention has been paid to metal nanoparticles owing to their potential applications in many fields such as catalysis, optics, microelectronics, magnetic, information storage, optical sensing, biological labeling and others. The properties of metal nanoparticles are strongly dependent on their size and shape, as well as their composition, crystallinity. As one of the noble metals, palladium has also attracted great interests because of its extraordinary properties. It can be widely used as the primary catalyst. In recent years, many techniques have been developed for the preparation of nanosized metallic materials, and different reducing agents and stabilizing compounds were employed to control particle size and shape. To date, however, though size control of spherical nanoparticals has been well solved, nanocrystal shape control is still a real synthetic challenge. In this paper, shape-controlled synthesis of the platinum nanoparticles was investigated.Uniform and well-dispersive platinum nanoparticles with flower-like structure were prepared by hydrothemal method with K2PtC16as a precursor, polyvinylpyrrolidone (PVP) as a stabilizer and a reducing agent in the presence of an appropriate amount of KBr. The products were characterized by UV vis absorption spectroscopy, transmission electron microscopy (TEM), X-ray diffraction (XRD) and X-ray photoelectron spectrometry (XPS). The effects of reaction time, temperature, the amount of PVP and KBr on the synthesis of flower-like platinum nanoparticles were investigated.Pt nanoparticles with uniform, self-assembled pompon-like nanostructure were synthesized by using H2PtC16as precursor, methylamine as a reducing agent, PVP as a stabilizer in the presence of an appropriate amount of KI. The as-prepared Pt nano-pompons were characterized by UV Vis absorption spectroscopy, TEM, XRD and XPS. The effects of reaction time, temperature, the concentration of methylamine and the amount of KI on the synthesis of flower-like platinum nanoparticles were investigated.Uniform and well-dispersive Pt/Pd bimetallic nanocubes were synthesized by hydrothemal method with K2PtCl6and PdC12as a co-precursor, PVP as both a stabilizer and a reducing agent in presence of an appropriate amount of KBr and KI. The as-prepared Pt/Pd bimetallic nanocubes were characterized by UV Vis absorption spectroscopy, TEM, XRD and XPS. The optimum condition was investigated. The results showed that the introduce of appropriate KBr and trace KI was critical to the formation of Pt/Pd bimetallic nanocubes.