title: Synthesis of single-crystalline platinum nanorods within a soft crystalline surfactant-Pt(II) complex.
abstract: Single-crystalline platinum nanorods, monodisperse in diameter, are synthesized through a simple process at room temperature, in cetyltrimethyl ammonium bromide (CTAB) solution. The complexation of the CTA+ surfactant ion with tetrachloroplatinate in the presence of hexanol leads to the formation of a precipitate with a lamellar crystalline structure. The reduction of Pt(II) metal ions to Pt(0) is carried out using gamma radiolysis. Transmission electron microscopy (TEM) observations of the nanoparticles extracted from the solution, three weeks after radiolysis, revealed single-crystalline Pt nanorods, monodisperse in diameter (3-4 nm) and 20-60 nm long. By following the shape of the nanorods at various stages of the growth, it was found that the single-crystalline nanorods grow by coalescence of spherical seeds 3-4 nm in diameter. This suggests an aggregative mechanism similar to that recently observed for silver particles in solution.
authors.affiliation: Laboratoire de Physique des Solides, UMR 8502 CNRS, Bât 510, Université Paris 11, 91405 Orsay Cedex, France.
authors.forename: Rema
authors.initials: R
authors.lastname: Krishnaswamy
authors.forename: Hynd
authors.initials: H
authors.lastname: Remita
authors.forename: Marianne
authors.initials: M
authors.lastname: Impéror-Clerc
authors.forename: Catherine
authors.initials: C
authors.lastname: Even
authors.forename: Patrick
authors.initials: P
authors.lastname: Davidson
authors.forename: Brigitte
authors.initials: B
authors.lastname: Pansu