Size-Controlled Synthesis of Palladium Nanoparticles

Abstract

Palladium nanoparticles protected by PVP were obtained first by reducing PdCl₂ with NaBH₄ solution. Then different size palladium nanoparticles with a large size range (1.49 nm ∼ 23.26 nm) were prepared by the multi-step reduction of PdCl₂ by hydrogen adsorbed on the surface of palladium nanoparticles. Transmission electron microscopy (TEM) and x-ray diffraction (XRD) were used to characterize the nanoparticles. The increasing value of average diameter from the first to the eighth reduction reaction is about 0.58 nm, from the ninth to the fifteenth reduction reaction the value is about 2.44 nm.

Keywords:

• Hydrogen adsorption
• multi-step reduction
• palladium nanoparticles
• poly(N-vinyl-2-pyrrolidone) (PVP)

This work was supported by the National Natural Science Foundation of China (Grant No. 90607024, No. 20673075) and partially supported by Key Academic Discipline of Organic Chemistry of Jiangsu Province.