The Controlled Syntheses Of Au/Pd Bimetallic Nanostructures, Mechanistic Study And Applications

Due to the synergistic effects, noble metal nanocomposites have superior chemical properties in catalytic reactions, fuel cells, biological reactions and optical properties, compared with monometallic nanomaterials. There are a variety of synthetic methods of noble metal nanocomposite material. Among them, seeded growth is one of the most important methods for synthesizing noble metal composite materials. Based on seeded growth, we synthetized two noble metal nanocomposite:penta-fold twinned (PFT) Pd-Au-Pd nanorod; Pd@Au core-shelled concaved nanocubes (CNCs). Their catalytic and surface enhancement Raman scattering performances were also studied. The main contents are as follows:(1) Pd-Au-Pd nanorods were prepared through using H2PdCl4 and Au decahedra as precursor and seeds, respectively. Besides, we studied the influence of reaction conditions, such as seed size, precursor concentration, the concentration of KI.Moreover, we designed experiments to explore its growth mechanism. In the electrocatalytic oxidation of formic acid, PFT Pd-Au-Pd nanorods showed good catalytic performance.(2) In the presence of Ag+, Pd@Au CNCs were prepared through using HAuCl4 and Pd nanocubes as precursor and seeds, respectively. The effects of AgNO3 on the growth of CNCs were investigated. It was found that Ag-based-substance (ABS) has a significant effect on the heterogeneous growth. Because Pd@Au CNCs has the characteristics of multi tip structure, it shows excellent performance in surface enhanced Raman scattering.