Controlled synthesis of 2-D and 3-D dendritic platinum nanostructures |
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Authors: | Song Yujiang Yang Yi Medforth Craig J Pereira Eulalia Singh Anup K Xu Huifang Jiang Yingbing Brinker C Jeffrey van Swol Frank Shelnutt John A |
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Institution: | Advanced Materials Laboratory, Sandia National Laboratories, and Department of Chemistry, University of New Mexico, Albuquerque, New Mexico, USA. |
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Abstract: | Seeding and autocatalytic reduction of platinum salts in aqueous surfactant solution using ascorbic acid as the reductant leads to remarkable dendritic metal nanostructures. In micellar surfactant solutions, spherical dendritic metal nanostructures are obtained, and the smallest of these nanodendrites resemble assemblies of joined nanoparticles and the nanodendrites are single crystals. With liposomes as the template, dendritic platinum sheets in the form of thin circular disks or solid foamlike nanomaterials can be made. Synthetic control over the morphology of these nanodendrites, nanosheets, and nanostructured foams is realized by using a tin-porphyrin photocatalyst to conveniently and effectively produce a large initial population of catalytic growth centers. The concentration of seed particles determines the ultimate average size and uniformity of these novel two- and three-dimensional platinum nanostructures. |
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