Open AccessKinetically Controlled Growth and Shape Formation Mechanism of Platinum Nanoparticles
Author(s) -
Janet M. Petroski,
Zhong Lin Wang,
Travis C. Green,
Mostafa A. ElSayed
Publication year - 1998
Publication title -
the journal of physical chemistry b
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.864
H-Index - 392
eISSN - 1520-6106
pISSN - 1520-5207
DOI - 10.1021/jp981030f
Subject(s) - platinum nanoparticles , platinum , nanoparticle , colloid , polymer , materials science , transmission electron microscopy , chemical engineering , catalysis , nanotechnology , chemical physics , chemistry , composite material , organic chemistry , engineering
Recently, we have been able to synthesize platinum colloidal nanoparticles of different shapes (Science, 1996, 272, 1924). In this report, we present transmission electron microscopic (TEM) results on the time-dependent shape distribution of platinum nanoparticles during the growth period and its dependence on the concentration of the capping polymer as well as the pH of the solution. The results suggest a shape-controlled growth mechanism in which the difference between the rate of the catalytic reduction process of Pt2+ on the {111} and {100} faces, the competition between the Pt2+ reduction and the capping process on the different nanoparticle surfaces, and the concentration-dependent buffer action of the polymer itself all control the final distribution of the different shapes observed.
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