title: Fabrication of SnO₂-reduced graphite oxide monolayer-ordered porous film gas sensor with tunable sensitivity through ultra-violet light irradiation.
abstract: A new graphene-based composite structure, monolayer-ordered macroporous film composed of a layer of orderly arranged macropores, was reported. As an example, SnO2-reduced graphite oxide monolayer-ordered macroporous film was fabricated on a ceramic tube substrate under the irradiation of ultra-violet light (UV), by taking the latex microsphere two-dimensional colloid crystal as a template. Graphite oxide sheets dispersed in SnSO4 aqueous solution exhibited excellent affinity with template microspheres and were in situ incorporated into the pore walls during UV-induced growth of SnO2. The growing and the as-formed SnO2, just like other photocatalytic semiconductor, could be excited to produce electrons and holes under UV irradiation. Electrons reduced GO and holes adsorbed corresponding negative ions, which changed the properties of the composite film. This film was directly used as gas-sensor and was able to display high sensitivity in detecting ethanol gas. More interestingly, on the basis of SnO2-induced photochemical behaviours, this sensor demonstrated tunable sensitivity when UV irradiation time was controlled during the fabrication process and post in water, respectively. This study provides efficient ways of conducting the in situ fabrication of a semiconductor-reduced graphite oxide film device with uniform surface structure and controllable properties.
authors.affiliation: School of Chemistry and Environment, South China Normal University, Guangzhou 510006, P. R. China.
authors.forename: Shipu
authors.initials: S
authors.lastname: Xu
authors.affiliation: 1] School of Chemistry and Environment, South China Normal University, Guangzhou 510006, P. R. China [2] Guangzhou Key Laboratory of Materials for Energy Conversion and Storage, P. R. China.
authors.forename: Fengqiang
authors.initials: F
authors.lastname: Sun
authors.affiliation: School of Chemistry and Environment, South China Normal University, Guangzhou 510006, P. R. China.
authors.forename: Shumin
authors.initials: S
authors.lastname: Yang
authors.affiliation: School of Chemistry and Environment, South China Normal University, Guangzhou 510006, P. R. China.
authors.forename: Zizhao
authors.initials: Z
authors.lastname: Pan
authors.affiliation: School of Chemistry and Environment, South China Normal University, Guangzhou 510006, P. R. China.
authors.forename: Jinfeng
authors.initials: J
authors.lastname: Long
authors.affiliation: 1] School of Chemistry and Environment, South China Normal University, Guangzhou 510006, P. R. China [2] Key Laboratory of Theoretical Chemistry of Environment, Ministry of Education, South China Normal University, P. R. China.
authors.forename: Fenglong
authors.initials: F
authors.lastname: Gu