Transport and encapsulation of gold nanoparticles in carbon nanotubes

Nanoscale
Alessandro La TorreAndrei N Khlobystov

Abstract

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.

References

Nov 1, 1990·Physical Review. B, Condensed Matter·T CastroR P Andres
Apr 12, 2003·Physical Review Letters·Hendrik UlbrichtTobias Hertel
May 24, 2005·Nature Materials·Lain-Jong LiR J Nicholas
Dec 20, 2005·Accounts of Chemical Research·Andrei N KhlobystovG Andrew D Briggs

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Citations

Dec 28, 2011·ACS Nano·Andrei N Khlobystov
Feb 24, 2012·ACS Nano·Alessandro La TorreAndrei N Khlobystov
Dec 15, 2015·Drug Discovery Today·Neelesh Kumar Mehra, Srinath Palakurthi
Jan 12, 2013·Angewandte Chemie·Maria del Carmen Gimenez-LopezAndrei N Khlobystov
Apr 5, 2014·Angewandte Chemie·Fabian MitschangAndreas Greiner
Nov 12, 2013·Biomaterials·Neelesh Kumar MehraN K Jain
Mar 19, 2016·Nanotechnology·A La TorreA N Khlobystov

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