Controlled Synthesis and Characterization of Nobel Metal Nanoparticles

Abstract

In this work, monodispersed, well-shaped platinum (3.2 - 6.4 nm), rhodium (2.4 - 5.1 nm), and palladium (3.2 - 5.3 nm) nanoparticles capped with poly(vinylpyrrolidone) (PVP) were synthesized by a polyol redn. method in an ethylene glycol soln. at temp. of 190°C. The influences of synthetic parameters on the size and morphol. of the noble metal nanoparticles have been systematically investigated. The noble metal nanoparticles were characterized by means of UV-vis, laser scattering particle size distribution anal. (LSPSDA) and transmission electron microscopy (TEM). The exptl. results showed that the particle size of metal nanoparticles, the morphol. of which was spherical, increased with the raise of metal precursor concn. as well as the amt. of PVP. The optimal molar ratio of PVP/metal and metal precursor concn. for the fabrication of Pt, Rh, and Pd nanoparticles with uniform distribution were 10 and 0.1 mM, resp. The morphologies of the Rh nanoparticles with the size of 5.1 nm were polygons, including hexagons, pentagons, and triangles. [on SciFinder(R)]