title: Highly NO2 sensitive caesium doped graphene oxide conductometric sensors.
abstract: Here we report on the synthesis of caesium doped graphene oxide (GO-Cs) and its application to the development of a novel NO2 gas sensor. The GO, synthesized by oxidation of graphite through chemical treatment, was doped with Cs by thermal solid-state reaction. The samples, dispersed in DI water by sonication, have been drop-casted on standard interdigitated Pt electrodes. The response of both pristine and Cs doped GO to NO2 at room temperature is studied by varying the gas concentration. The developed GO-Cs sensor shows a higher response to NO2 than the pristine GO based sensor due to the oxygen functional groups. The detection limit measured with GO-Cs sensor is ≈90 ppb.
authors.affiliation: Institute for Future Environments and School of Chemistry, Physics, and Mechanical Engineering, Queensland University of Technology, Brisbane, QLD 4001, Australia.
authors.forename: Carlo
authors.initials: C
authors.lastname: Piloto
authors.affiliation: Institute for Future Environments and School of Chemistry, Physics, and Mechanical Engineering, Queensland University of Technology, Brisbane, QLD 4001, Australia.
authors.forename: Marco
authors.initials: M
authors.lastname: Notarianni
authors.affiliation: Institute for Future Environments and School of Chemistry, Physics, and Mechanical Engineering, Queensland University of Technology, Brisbane, QLD 4001, Australia.
authors.forename: Mahnaz
authors.initials: M
authors.lastname: Shafiei
authors.affiliation: The University of Queensland, Australian Institute for Bioengineering and Nanotechnology, Australian National Fabrication Facility - QLD Node, Brisbane, QLD 4072, Australia.
authors.forename: Elena
authors.initials: E
authors.lastname: Taran
authors.affiliation: Institute for Future Environments and School of Chemistry, Physics, and Mechanical Engineering, Queensland University of Technology, Brisbane, QLD 4001, Australia.
authors.forename: Dilini
authors.initials: D
authors.lastname: Galpaya
authors.affiliation: Institute for Future Environments and School of Chemistry, Physics, and Mechanical Engineering, Queensland University of Technology, Brisbane, QLD 4001, Australia.
authors.forename: Cheng
authors.initials: C
authors.lastname: Yan
authors.affiliation: Institute for Future Environments and School of Chemistry, Physics, and Mechanical Engineering, Queensland University of Technology, Brisbane, QLD 4001, Australia.
authors.forename: Nunzio
authors.initials: N
authors.lastname: Motta
keywords: caesium; conductometric; doping; drop casting; gas sensor; graphene oxide; highly sensitive; nitrogen dioxide