Journal
SMALL
Volume 8, Issue 8, Pages 1222-1228Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/smll.201102007
Keywords
gold nanoparticles; carbon nanofibers; carbon nanotubes; host-guest interactions
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Funding
- European Science Foundation
- Royal Society
- University of Nottingham
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Interactions of free-standing gold nanoparticles and hollow graphitized nanofibers in colloidal suspension are investigated, revealing the first example of the controlled arrangement of nanoparticles inside nano-containers, as directed by their internal structure. The ordering is highly effective for small gold nanoparticles whose sizes are commensurate with the height of graphitic step-edges in the graphitized carbon nanofibers and is less effective for larger gold nanoparticles. Studies aimed at understanding the role of the organic-solvent surface tension, employed for the filling experiments, demonstrate that gold nanoparticles become preferentially anchored into the hollow graphitized carbon nanofibers under a mixture of pentane/CO2 in supercritical conditions. It is shown that a three-step cleaning procedure enables effective removal of gold nanoparticles adsorbed on the exterior surface of graphitized carbon nanofibers, while ordered arrays of encapsulated nanoparticles are retained.
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