%0 Journal Article
%T Core-Shell Bimetallic Au-Pd Nanoparticles: Synthesis, Structure, Optical and Catalytic Properties
%J Nanoscience and Nanotechnology
%@ 2163-2588
%D 2011
%I 
%R 10.5923/j.nn.20110102.08
%X Colloidal dispersions of bimetallic nanoparticles composed of gold and palladium were prepared by wet chemical method, in which Au(III) and Pd(II) ions in an aqueous solution in the presence of a cationic surfactant, Cetyltrimethylammonium bromide (CTAB). The structure and composition of the metallic nanoparticles were characterized by UV-visible spectroscopy (UV-Vis), High-resolution transmission electron microscopy (HRTEM), Scanning electron microscopy (SEM-EDX), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and Fourier transform infrared spectroscopy (FTIR). Transmission electron microscopy photographs showed spherical particles whose size had a fairly narrow distribution with a geometric mean diameter about 9.4 nm. Analyses with UV-Vis spectra indicated that Au(III) ions were first reduced and after their consumption reduction of Pd(II) ions set in. A core-shell structure of the particles, a core of gold and a shell of palladium was confirmed by high-resolution TEM and X-ray diffraction. The catalytic activities of nanoparticles are tested on the hydrogenation reaction between NaBH4 and 4-Nitrophenol reduction was studied spectrophotometrically. Bimetallic nanoparticles exhibited better catalysis that the mono metallic nanoparticles, which may be due to the electronic effects of the core to shell metal atoms.
%K Gold Nanoparticle
%K Palladium Nanoparticle
%K Gold-Palladium Bimetallic Nanoparticles
%K Hydrogenation
%K 4-Nitrophenol
%K Kinetic Study
%U http://article.sapub.org/10.5923.j.nn.20110102.08.html