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Nanoparticle Dispersion on Reconstructed Carbon Nanomeshes

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Department of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore 117543, Singapore, and Department of Physics, National University of Singapore, 2 Science Drive 3, Singapore 117542, Singapore
Cite this: Langmuir 2004, 20, 25, 10779–10784
Publication Date (Web):November 10, 2004
https://doi.org/10.1021/la048530m
Copyright © 2004 American Chemical Society
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    Abstract

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    A nanoporous template which can be used for the preparation of monodispersed metal nanoparticles can have wide-ranging applications in the catalyzed growth of single-walled nanotubes, as well as the preparation of energetic, nanostructured ferromagnetic particle arrays. Here, we found that a honeycomb-like carbon nanomesh with periodically arranged pores of ∼2-nm dimension could be fabricated on the reconstructed 6H-SiC(0001) surface. The carbon nanomesh arises from the periodic arrangement of segregated carbon clusters on the 6H-SiC surface to form a highly regular, nanoporous film. The carbon nanomesh can be dynamically structured to control the periodicity and depth of the pores by annealing in a vacuum. We evaporated cobalt on the surface of the nanomesh and investigated the diffusion and agglomeration behavior of cobalt clusters using in situ scanning tunneling microscopy. It is found that monodispersed Co nanoclusters that resist aggregation up to a temperature of 500 °C can be fabricated on this template.

    †

     Department of Chemistry, National University of Singapore.

    *

     Corresponding author. E-mail:  [email protected] (K. P. Loh).

    ‡

     Department of Physics, National University of Singapore.

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