Investigation of the Influence of Organometallic Precursors on the Formation of Cobalt Nanoparticles

Rohini M. de Silva,† Vadim Palshin,† Frank R. Fronczek,‡ Josef Hormes,† and Challa S. S. R. Kumar*†
Centre for Advanced Microstructures and Devices, Louisiana State University, 6980 Jefferson Highway, Baton Rouge, Louisiana 70806, and Department of Chemistry, Louisiana State University, Baton Rouge, Louisiana 70803
J. Phys. Chem. C, 2007, 111 (28), pp 10320–10328
DOI: 10.1021/jp070499k
Publication Date (Web): June 22, 2007
Copyright © 2007 American Chemical Society
†

 Centre for Advanced Microstructures and Devices.

,
‡

 Department of Chemistry.

,
*

In papers with more than one author, the asterisk indicates the name of the author to whom inquiries about the paper should be addressed.

Abstract

An investigation of the influence of organometallic precursors on the formation of cobalt nanoparticles is presented. The cobalt nanoparticles were obtained by decomposing two different organometallic cobalt complexes, [(Co2(μ-HCCH)(CO)6] and [Co2(CO)8], under identical experimental conditions. Time-dependent FT-IR analysis revealed different decomposition routes, rates, and reaction intermediates leading to the formation of cobalt nanoparticles. Spectroscopic data in addition to X-ray crystallography confirmed the structures of reaction intermediates from [(Co2(μ-HCCH)(CO)6]. The crystal structure, particle size, size distribution, and magnetic properties of the cobalt nanoparticles from the two precursors were analyzed using synchrotron radiation based X-ray absorption spectroscopy (XAS), transmission electron microscopy (TEM), and superconducting quantum interference device (SQUID) magnetometry, respectively, and showed significant differences.

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History

  • Published In Issue July 19, 2007
  • Received January 20, 2007
    Revised April 26, 2007

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