title: Role of anions in the AuCl3-doping of carbon nanotubes.
abstract: The doping/dedoping mechanism of carbon nanotubes (CNTs) with AuCl(3) has been investigated with regard to the roles of cations and anions. Contrary to the general belief that CNTs are p-doped through the reduction of cationic Au(3+) to Au(0), we observed that chlorine anions play a more important role than Au cations in doping. To estimate the effects of Cl and Au on CNTs, the CNT film was dedoped as a function of the annealing temperature (100-700 °C) under an Ar ambient and was confirmed by the sheet resistance change and the presence of a G-band in the Raman spectra. The X-ray photoelectron spectroscopy (XPS) analysis revealed that the doping level of the CNT film was strongly related to the amount of adsorbed chlorine atoms. Annealing at temperatures up to 200 °C did not change the amount of adsorbed Cl atoms on the CNTs, and the CNT film was stable under ambient conditions. Alternatively, Cl atoms started to dissociate from CNTs at 300 °C, and the stability of the film was degraded. Furthermore, the change in the amount of Cl atoms in CNTs was inversely proportional to the change in the sheet resistance. Our observations of the Cl adsorption, either directly or mediated by an Au precursor on the CNT surface, are congruent with the previous theoretical prediction.
authors.affiliation: BK21 Physics Division, Department of Energy Science, Center for Nanotubes and Nanostructured Composites, Sungkyunkwan Advanced Institute of Nanotechnology, Sungkyunkwan University, Suwon 440-746, Korea.
authors.forename: Soo Min
authors.initials: SM
authors.lastname: Kim
authors.forename: Ki Kang
authors.initials: KK
authors.lastname: Kim
authors.forename: Young Woo
authors.initials: YW
authors.lastname: Jo
authors.forename: Min Ho
authors.initials: MH
authors.lastname: Park
authors.forename: Seung Jin
authors.initials: SJ
authors.lastname: Chae
authors.forename: Dinh Loc
authors.initials: DL
authors.lastname: Duong
authors.forename: Cheol Woong
authors.initials: CW
authors.lastname: Yang
authors.forename: Jing
authors.initials: J
authors.lastname: Kong
authors.forename: Young Hee
authors.initials: YH
authors.lastname: Lee