Journal
CHEMPHYSCHEM
Volume 7, Issue 7, Pages 1510-1513Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cphc.200600127
Keywords
aggregation; crystal growth; nanostructures; platinum; X-ray diffraction
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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 304 nm in diameter. This suggests an aggregative mechanism similar to that recently observed for silver particles in solution.
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