title: Noncovalently modified carbon nanotubes with carboxymethylated chitosan: a controllable donor-acceptor nanohybrid.
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 micros) for the shorter-chain cmCs coated MWNTs against that of the longer-chain cmCs coated MWNTs (~3.5 micros). The results demonstrated that the cmCs/MWNTs composite may be applied as a controllable donor-acceptor nanohybrid.
authors.affiliation: Department of Nuclear Analysis, Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai, 201800 China.
authors.forename: Dewu
authors.initials: D
authors.lastname: Long
authors.affiliation: Department of Nuclear Analysis, Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai, 201800 China.
authors.forename: Guozhong
authors.initials: G
authors.lastname: Wu
authors.affiliation: Department of Nuclear Analysis, Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai, 201800 China.
authors.forename: Guanglai
authors.initials: G
authors.lastname: Zhu