title: The enhancement of oxygen sensitivity of ZnO macropore film by functionalizing with azo pigment.
abstract: Azo-ZnO hybrid films were prepared by functionalizing the ZnO macropore films with azo pigment (1,1'-(biphenyl-4,4'-diylbis(diazene-2,1-diyl))dinaphthalen-2-ol). Scanning electronic microscopy, current-voltage, UV-Vis absorption spectroscopy and Kelvin probe were used to characterize these films. The oxygen sensing characteristics of hybrid films and pure ZnO film were measured under the irradiation of UV light. The results show that the sensitivity of hybrid film is about 500 times higher than that of pure ZnO film. The high sensitivity to oxygen of hybrid films is mainly attributed to the increasing of the photo-generated electron concentration. Enhanced photo-induced charge separation after functionalization is confirmed by the pattern of transient photovoltage. Our results demonstrate that the functionalization with azo pigment is a promising approach to enhance the oxygen sensitivity of ZnO under the irradiation of UV light.
authors.affiliation: AG Macdiarmid Institute, College of Chemistry, Jilin University, Changchun 130012, PR China.
authors.forename: Liang
authors.initials: L
authors.lastname: Peng
authors.forename: Jiali
authors.initials: J
authors.lastname: Zhai
authors.forename: Dejun
authors.initials: D
authors.lastname: Wang
authors.forename: Yu
authors.initials: Y
authors.lastname: Zhang
authors.forename: Qidong
authors.initials: Q
authors.lastname: Zhao
authors.forename: Ping
authors.initials: P
authors.lastname: Wang
authors.forename: Shan
authors.initials: S
authors.lastname: Pang
authors.forename: Zhiyong
authors.initials: Z
authors.lastname: Fan
authors.forename: Tengfeng
authors.initials: T
authors.lastname: Xie