title: Layer-by-layer assembled carbon nanotube films with molecule recognition function and lower capacitive background current.
abstract: Multilayer films of multiwalled carbon nanotubes (MWCNTs) with molecule recognition function were assembled on glassy carbon (GC) electrode with lower capacitive background current by two steps: first, MWCNTs interacted with beta-cyclodextrin (beta-CD) with the aid of sonication to form beta-CD-MWCNTs nanocomposite, then the beta-CD-MWCNTs nanocomposite was assembled on GC electrode using layer-by-layer (LBL) method based on electrostatic interaction of positively charged biopolymer chitosan and negatively charged MWCNTs. The assembled beta-CD-MWCNTs multilayer films were characterized by scanning electron microscopy (SEM) and cyclic voltammetry. The SEM indicated that the MWCNTs multilayer films with beta-CD were somewhat more compact than that of the MWCNTs multilayer films without beta-CD. The cyclic voltammetric results indicated that the assembled MWCNTs with beta-CD on GC electrode exhibited lower capacitive background current than the assembled MWCNTs without beta-CD. The MWCNTs multilayer films with beta-CD were studied with respect to the electrocatalytic activity toward dopamine (DA). Compared with the MWCNTs multilayer films without beta-CD, the MWCNTs multilayer films with beta-CD possesses a much lower capacitive background current and higher electrocatalytic activity in phosphate buffer, which was ascribed to the relatively compact three-dimensional structure of the MWCNTs multilayer films with beta-CD and the excellent molecule recognition function of beta-CD.
authors.affiliation: State Key Laboratory of Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Hunan, Changsha 410082, PR China.
authors.forename: Bo
authors.initials: B
authors.lastname: Kong
authors.forename: Jinxiang
authors.initials: J
authors.lastname: Zeng
authors.forename: Guangming
authors.initials: G
authors.lastname: Luo
authors.forename: Shenglian
authors.initials: S
authors.lastname: Luo
authors.forename: Wanzhi
authors.initials: W
authors.lastname: Wei
authors.forename: Jun
authors.initials: J
authors.lastname: Li
mesh_terms: D048271:Chitosan; D004298:Dopamine / Q000032:analysis; D004563:Electrochemistry; D008855:Microscopy, Electron, Scanning; D037742:Nanotubes, Carbon / Q000737:chemistry*; D055672:Static Electricity; D047392:beta-Cyclodextrins
chemical_list: D037742:Nanotubes, Carbon; D047392:beta-Cyclodextrins; D048271:Chitosan; D004298:Dopamine