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Core-Shell Bimetallic Au-Pd Nanoparticles : Synthesis , Structure , Optical and Catalytic Properties
| Content Provider | Semantic Scholar |
|---|---|
| Author | Venkatesan, Parthiban Santhanalakshmi, Jayadevan |
| Copyright Year | 2012 |
| Abstract | 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. |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | http://article.sapub.org/pdf/10.5923.j.nn.20110102.08.pdf |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
