A Study on the Preparation of Rhodium Nanoparticles by Using Chemical Reduction Method

• Main Authors: Lin-Hsiang Cheng, 鄭琳祥
• Other Authors: 蔡德華
• Format: Others
• Language: zh-TW
• Published: 2008
• Online Access: http://ndltd.ncl.edu.tw/handle/m5y7tx

碩士 === 國立臺北科技大學 === 化學工程研究所 === 96 === The preparation of rhodium nanoparticles has attracted the research interest of scientists because of their potential application in catalytic reactions. The common method used for fabrications of nanoparticles is chemical reduction in which metal salts were reduced in aqueous solutions. Stabilizers were usually added to avoid aggregation and to promote the dispersion of the nanoparticles. A milder preparative chemical reduction method to produce metal nanoparticles in aqueous phase was developed in this research. Furthermore, the sizes and the shapes of the nanoparticles were controlled by modulating several experimental parameters. Reduction of aqueous RhCl3 with NaBH4 in the presence of poly(vinyl pyrrolidone) (PVP) yields dense spherical nanostructures. The nanoparticles aggregates, generally have diameters between 30 to 100 nm .The results demonstrated that the size of rhodium nanoparticles could be controlled by modulating the concentration of the precursor in the solution and the types of the surfactants. The characterizations of the rhodium nanostructures were carried out by scan electron microscope (SEM), dynamic light scattering (DLS) and X-ray powder diffraction (XRD) methods.