Controlled synthesis of 2-D and 3-D dendritic platinum nanostructures.
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.
Song
Yujiang
Y
Advanced Materials Laboratory, Sandia National Laboratories, and Department of Chemistry, University of New Mexico, Albuquerque, New Mexico, USA.
Yang
Yi
Y
Medforth
Craig J
CJ
Pereira
Eulalia
E
Singh
Anup K
AK
Xu
Huifang
H
Jiang
Yingbing
Y
Brinker
C Jeffrey
CJ
van Swol
Frank
F
Shelnutt
John A
JA