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Kinetically Controlled Growth And Shape Formation Mechanism Of Platinum Nanoparticles

Published online by Cambridge University Press:  02 July 2020

Janet M. Petroski ,
Zhong L. Wang ,
Travis C. Green  and
Mostafa A. El-Sayed
Janet M. Petroski
Affiliation:
Laser Dynamics Laboratory, School of Chemistry and Biochemistry
Zhong L. Wang
Affiliation:
School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, GA30332
Travis C. Green
Affiliation:
Laser Dynamics Laboratory, School of Chemistry and Biochemistry
Mostafa A. El-Sayed
Affiliation:
School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, GA30332
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Extract

Many studies on colloidal nanoparticles have focused on the control of nanoparticle size and correlated this to the catalytic activity. Recently, our group has reported for the first time a technique that controlled the shape distribution of Pt nanoparticles. This was done by varying the concentration of the capping polymer and the platinum ion ratio used in the reductive synthesis of colloidal nanoparticles at room temperature. Cubic, tetrahedral and truncated octahedral (TO) particles have been prepared, making it possible to study the catalytic activities of nanoparticles with different shapes and facets.

Using transmission electron microscopy (TEM), we imaged the shapes and determined the shape distribution of platinum nanoparticles at different stages of their growth as a function of time. The small nanoparticles formed during the early stages of growth or at high polymer concentration displayed distributions with a dominance of tetrahedral shapes (see Figure la).

Type
Nanophase and Amorphous Materials
Information
Microscopy and Microanalysis , Volume 4 , Issue S2: Proceedings: Microscopy & Microanalysis '98, Microscopy Society of America 56th Annual Meeting, Microbeam Analysis Society 32nd Annual Meeting, Atlanta, Georgia July 12-16, 1998 , July 1998 , pp. 746 - 747
Copyright
Copyright © Microscopy Society of America

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References

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7. This work was supported by the Office of Naval Research (Grant N00014-95-1-0306) and NSF grant DMR-963 2823.Google Scholar