title: High-performance formaldehyde gas-sensors based on three dimensional center-hollow ZnO.
abstract: Three dimensional (3D) center-hollow ZnO architectures assembled by nanoparticles have been successfully fabricated on a large scale via a template-free method using an oil bath. The samples were characterized by X-ray diffraction, scanning electron microscopy, transmission electron microscopy, Brunauer-Emmett-Teller specific surface area, surface photocurrent and UV-Vis diffuse reflectance spectroscopy. The photoelectric gas-sensing results demonstrated that the 3D porous, center-hollow ZnO structures exhibited excellent sensitivity and good selectivity to formaldehyde under 365 nm light irradiation at room temperature. The gas response to 1 ppm formaldehyde can reach 70%, which is superior to the results reported in the literature, indicating that the 3D center-hollow ZnO architectures are ideal candidate materials for photoelectric gas sensors. The underlying mechanisms responsible for the high sensitivity and selectivity to formaldehyde are discussed, which provide a new pathway for designing novel VOC sensors. Moreover, the facile method presented in this paper has the advantage of low-cost and high-yield, which is suitable for the practical production processes.
authors.affiliation: College of Chemistry, Jilin University, Changchun 130012, P. R. China. linyh@jlu.edu.cn.
authors.forename: Linqi
authors.initials: L
authors.lastname: Shi
authors.affiliation: College of Chemistry, Jilin University, Changchun 130012, P. R. China. linyh@jlu.edu.cn.
authors.forename: Jiabao
authors.initials: J
authors.lastname: Cui
authors.affiliation: College of Chemistry, Jilin University, Changchun 130012, P. R. China. linyh@jlu.edu.cn.
authors.forename: Fei
authors.initials: F
authors.lastname: Zhao
authors.affiliation: College of Chemistry, Jilin University, Changchun 130012, P. R. China. linyh@jlu.edu.cn.
authors.forename: Dejun
authors.initials: D
authors.lastname: Wang
authors.affiliation: College of Chemistry, Jilin University, Changchun 130012, P. R. China. linyh@jlu.edu.cn.
authors.forename: Tengfeng
authors.initials: T
authors.lastname: Xie
authors.affiliation: College of Chemistry, Jilin University, Changchun 130012, P. R. China. linyh@jlu.edu.cn.
authors.forename: Yanhong
authors.initials: Y
authors.lastname: Lin