title: ZnO-coated carbon nanotubes: inter-diffusion of carboxyl groups and enhanced photocurrent generation.
abstract: ZnO is a defect-governed oxide and emits light at both visible and UV regimes. This work employs atomic layer deposition to produce oxide particles on oxygenated carbon nanotubes, and the composites only show emission profiles at short wavelengths. The quenching of defect-related emissions at long wavelengths is verified, owing to carboxyl diffusion into oxygen vacancies, and doping is supported by ZnCO3 formation in oxide lattice. Fully coated tubes display an increased photocurrent and the quantum efficiency increases by 22 % relative to the bare nanotubes.
authors.affiliation: Department of Materials Science and Engineering, National Tsing Hua University, No.101, Section 2 Kuang Fu Road, Hsinchu, 30013 (Taiwan); Research Center for Applied Sciences, Academia Sinica Institution, No. 128 Sec. 2, Academia Rd., Nankang, Taipei 11529 (Taiwan).
authors.forename: Chia-I
authors.initials: CI
authors.lastname: Hung
authors.forename: Hua-Chiang
authors.initials: HC
authors.lastname: Wen
authors.forename: Yao-Cheng
authors.initials: YC
authors.lastname: Lai
authors.forename: Shih-Hsin
authors.initials: SH
authors.lastname: Chang
authors.forename: Wu-Ching
authors.initials: WC
authors.lastname: Chou
authors.forename: Wen-Kuang
authors.initials: WK
authors.lastname: Hsu
keywords: carbon nanotubes; defects; nanostructures; photocurrent; zinc oxide