title: Faster response of NO₂ sensing in graphene-WO₃ nanocomposites.
abstract: Graphene-based nanocomposites have proven to be very promising materials for gas sensing applications. In this paper, we present a general approach for the preparation of graphene-WO(3) nanocomposites. Graphene-WO(3) nanocomposite thin-layer sensors were prepared by drop coating the dispersed solution onto the alumina substrate. These nanocomposites were used for the detection of NO(2) for the first time. TEM micrographs revealed that WO(3) nanoparticles were well distributed on graphene nanosheets. Three different compositions (0.2, 0.5 and 0.1 wt%) of graphene with WO(3) were used for the gas sensing measurements. It was observed that the sensor response to NO(2) increased nearly three times in the case of graphene-WO(3) nanocomposite layer as compared to a pure WO(3) layer at room temperature. The best response of the graphene-WO(3) nanocomposite was obtained at 250 °C.
authors.affiliation: Physics of Energy Harvesting, National Physical Laboratory, Dr K S Krishnan Marg, New Delhi, 110012, India.
authors.forename: Shubhda
authors.initials: S
authors.lastname: Srivastava
authors.forename: Kiran
authors.initials: K
authors.lastname: Jain
authors.forename: V N
authors.initials: VN
authors.lastname: Singh
authors.forename: Sukhvir
authors.initials: S
authors.lastname: Singh
authors.forename: N
authors.initials: N
authors.lastname: Vijayan
authors.forename: Nita
authors.initials: N
authors.lastname: Dilawar
authors.forename: Govind
authors.initials: G
authors.lastname: Gupta
authors.forename: T D
authors.initials: TD
authors.lastname: Senguttuvan
mesh_terms: D003217:Conductometry / Q000295:instrumentation*; D004867:Equipment Design; D019544:Equipment Failure Analysis; D005740:Gases / Q000032:analysis; D006108:Graphite / Q000737:chemistry*; D049329:Nanostructures / Q000737:chemistry*; D009569:Nitric Oxide; D010087:Oxides / Q000737:chemistry*; D014159:Transducers; D014414:Tungsten / Q000737:chemistry*
chemical_list: D005740:Gases; D010087:Oxides; D009569:Nitric Oxide; D006108:Graphite; C511604:tungsten oxide; D014414:Tungsten