Synthesis And Catalytic Performance Of AuPd Bimetallic Nanoparticles

Gold nanoparticles(Au NPs) display good surface plasmon resonance(SPR) absorption property and palladium(Pd) NPs have excellent catalytic activity. Therefore the synthesis of multifunction bimetallic NPs composed of Au and Pd is of great significance.Until now, a variety of synthetic methods for Pd NPs in aqueous or nonhydrolytic media have been developed. A myriad of shape-controlled Pd NPs, such as ployhedral NPs, branched multipods, flowerlike NPs, and nanorods have been routinely synthesized. However, until now, synthesis of AuPd bimetallic NPs with excellent(SPR) has not been accomplished. In this thesis, a rapid method is developed to get AuPd NPs with excellent SPR property. In addition, the formation mechanism and catalytic performance of the products were investigated. This thesis consists of following sections:(1) The flower like AuPd nanoparticles were effectively synthesized in the ethylene glycol(EG) solution through a seed-mediated method by using Au decahedron as seeds. The influence of factors such as; reaction temperature, concentrations of ascorbic acid(AA) and precursor was explored. Last but not least, the catalytic performance of flower like AuPd nanoparticles in the reduction of p-nitrophenol is also studied. The results showed that the flower like AuPd NPs have excellent catalytic activity.(2) The rod shaped AuPd nanoparticles having uniform size were successfully produced in an aqueous solution by using cetyltrimethylammonium bromide(CTAB) as surfactant. The formation mechanism of products was proposed by investigating the reaction process and influence factors. The size of nanorods could be controlled by changing the amount of seed and CTAB. Furthermore, the activity of nanorods for the oxidation of ethanol in the alkaline electrolyte solution is also done. These bimetallic nanorods have 6.8 times high catalytic performance in terms of ethanol oxidation than commercial Pd.(3) The high-yield synthesis of Pd spindle nanoparticles having uniform size in an aqueous solution through a one-pot reaction. At the end, the impact of various factors such as;reaction temperature, concentrations of cetyltrimethylammonium chloride(CTAC), sodium iodide(NaI) and AA on the synthesis of Pd spindle nanoparticles were systematically investigated.