Highly NO2 sensitive caesium doped graphene oxide conductometric sensors
Carlo Piloto, Marco Notarianni, Mahnaz Shafiei, Elena Taran, Dilini Galpaya, Cheng Yan, Nunzio Motta
BEILSTEIN JOURNAL OF NANOTECHNOLOGY | BEILSTEIN-INSTITUT | Published : 2014
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.
Awarded by Australian Research Council
The authors acknowledge the financial support of the Australian Research Council through the Discovery Projects DP130102120 and DP110101454. We also acknowledge the Marie Curie International Research Staff Exchange Scheme Fellowship within the 7th European Community Framework Programme, and the Australian Government Department of Agriculture, Fisheries and Forestry program "Filling the research gap" for funding.