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Int. J. Mol. Sci. 2008, 9(2), 120-130; doi:10.3390/ijms9020120
Article

Noncovalently Modified Carbon Nanotubes with Carboxymethylated Chitosan: A Controllable Donor-Acceptor Nanohybrid

, *  and
Department of Nuclear Analysis, Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai, 201800 China
* Author to whom correspondence should be addressed.
Received: 4 January 2008 / Accepted: 31 January 2008 / Published: 5 February 2008
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Abstract

We report here the modification of multiwalled carbon nanotubes (MWNTs) with a kind of polysaccharide, carboxymethylated chitosan (cmCs), and their potential usage as donor-acceptor nanohybrids. The modified composites (cmCs/MWNTs) were characterized by high-resolution TEM, FT-IR, TGA and time-resolved spectroscopy. The time-resolved spectroscopic experiments revealed that interfacial electron transfer readily takes place between MWNTs and surface immobilized cmCs chains. The forward electron transfer is fast (> 20 ns) while the backward recombination is slow. The recombination process strongly depends on the chain length of carboxylmethylated chitosan, i.e. a shorter recombination lifetime (~1.1 µs) for the shorter-chain cmCs coated MWNTs against that of the longer-chain cmCs coated MWNTs (~3.5 µs). The results demonstrated that the cmCs/MWNTs composite may be applied as a controllable donor-acceptor nanohybrid.
Keywords: multiwalled carbon nanotubes; carboxymethylated chitosan; charge separation; donor-accepter nanohybrid. multiwalled carbon nanotubes; carboxymethylated chitosan; charge separation; donor-accepter nanohybrid.
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).
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Long, D.; Wu, G.; Zhu, G. Noncovalently Modified Carbon Nanotubes with Carboxymethylated Chitosan: A Controllable Donor-Acceptor Nanohybrid. Int. J. Mol. Sci. 2008, 9, 120-130.

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