Ultraviolet photoresponse properties of single-walled carbon nanotubes decorated with thickness-controlled ZnO layer by pulsed laser deposition

Itabashi, Kenta; Tabata, Hiroshi; Wongwiriyapan, Winadda; Minami, Shinji; Matsushita, Kazutoshi; Shimazaki, Ryotaro; Ueda, Tsuyoshi; Ito, Tatsuya; Katayama, Mitsuhiro

doi:10.1143/JJAP.51.055104

Ultraviolet photoresponse properties of single-walled carbon nanotubes decorated with thickness-controlled ZnO layer by pulsed laser deposition

Author(s)

Itabashi, Kenta

Tabata, Hiroshi

Wongwiriyapan, Winadda

Minami, Shinji

Matsushita, Kazutoshi

Shimazaki, Ryotaro

Ueda, Tsuyoshi

Ito, Tatsuya

Katayama, Mitsuhiro

Date Issued

May 1, 2012

Type

Article

DOI

10.1143/JJAP.51.055104

Abstract

We fabricated single-walled carbon nanotubes (SWNTs) covered with a thickness-controlled ZnO layer (ZnO-SWNTs) by pulsed laser deposition (PLD) and investigated their UV photoresponse, induced by the photodesorption of oxygen molecules from the ZnO surface. The magnitude of the negative photocurrent and the recovery time were strongly dependent on the thickness and morphology of the ZnO layer, and were highest when the ZnO layer was 3-4nm thick. The observed recovery curves of the negative photocurrent were fitted with double-exponential-function curves, which indicate the coexistence of two types of adsorption sites for oxygen molecules on the ZnO surface. The light intensity dependence of the negative photocurrent was also measured. © 2012 The Japan Society of Applied Physics.

Citation

Japanese Journal of Applied Physics, 51(5 PART 1), 2012