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Issue 6, 2010
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Transport and encapsulation of gold nanoparticles in carbon nanotubes

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Nanoparticles confined in small volumes exhibit functional properties different from that of the bulk material. Furthermore, the smaller the volume available then the greater the effects of confinement are observed to be. Metallic nanoparticles encapsulated within carbon nanotubes have been proposed for many applications ranging from catalysis to quantum storage devices. In this study we examine encapsulation of discrete gold nanoparticles (AuNP) within multi-wall carbon nanotubes (MWNT), with internal diameter less than 10 nm. During the encapsulation process AuNP undergo Ostwald ripening allowing them to reach a diameter that precisely matches the internal diameter of MWNT (snug fit). The use of supercritical CO2 as a processing medium enables efficient transport and irreversible encapsulation of AuNP into narrow nanotubes. Once inside MWNT, the nanoparticles are unable to grow further and retain their spheroidal shape. This dynamic behaviour observed for AuNP differs significantly from the behaviour of molecular guest-species under similar conditions.

Graphical abstract: Transport and encapsulation of gold nanoparticles in carbon nanotubes

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Publication details

The article was received on 16 Jan 2010, accepted on 11 Mar 2010 and first published on 30 Apr 2010

Article type: Paper
DOI: 10.1039/C0NR00035C
Nanoscale, 2010,2, 1006-1010

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    Transport and encapsulation of gold nanoparticles in carbon nanotubes

    A. La Torre, G. A. Rance, J. El Harfi, J. Li, D. J. Irvine, P. D. Brown and A. N. Khlobystov, Nanoscale, 2010, 2, 1006
    DOI: 10.1039/C0NR00035C

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