Gold nanoparticle arrays catalyze alcohol oxidation reactions in methanol fuel cells. We have studied four different alcohols for potential replacement of methanol and two classes of alternative nanostructured surfaces compared to pure gold nanoparticles. Gold-palladium bimetallic nanoparticles are generated on TMSPP (trimethoxysilylpropyl (polyethyl enimine)) functionalized silicon and indium tin oxide (ITO) coated glass surfaces through reduction of surface bound metal ions (AuCl4- and PdCl42-) by appropriate reducing agent. The concentrations of gold and palladium precursors were systematically varied in the surface attachment step of metal ions to generate nanoparticles with different mole ratios. The in situ synthesis of anisotropic gold nanorods on functionalized surfaces was derived from surface bound gold nanoparticle seeds of specific sizes. Gold seeds are generated on TMSPP functionalized silicon and ITO glass through adsorption of gold ions followed by reduction with a strong reducing agent. Surfaces with gold nanoparticle seeds are then submerged in growth solutions of cationic surfactant (cetyltrimethyl ammonium bromide CTAB & benzyldimethyl ammonium chloride BDAC), gold (III) trichloride, and weak reducing agent to direct the growth of anisotropic shapes. Length of exposure to the growth solution is varied. UV-Visible measurement shows shift in the surface plasmon absorption band due to varied Au:Pd ration in bimetallic nanoparticles and for anisotropic growth of pure gold nanorods. Atomic force microscopy (AFM) and scanning electron microscopy (SEM) are used follow the morphology of these structures. X-ray photoelectron spectroscopy (XPS) is used to measure the elemental composition of the bimetallic nanoparticles. The catalytic activity of all these nanostructured are assessed by cyclic voltammetry using different multi-carbon alcohols and polyalcohols.

Generation of anisotropic gold and gold-palladium bimetallic nanoparticles on functionalized surfaces

Macromolecular Chemistry: The Second Century

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ACS Spring 2020 National Meeting & Expo

The official archive and repository for all ACS Meetings & Expositions abstracts and select posters or presentations.