Graphene-based LbL deposited films: further study of electrical and gas sensing properties

NABOK, Aleksey, WALCH, N.J., DUTTON, S, DAVIS, F. and HIGSON, S.P.J. (2017). Graphene-based LbL deposited films: further study of electrical and gas sensing properties. MATEC Web of Conferences, 98, 04001.

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    Graphene-surfactant composite materials obtained by the ultrasonic exfoliation of graphite powder in the presence of ionic surfactants (either CTAB or SDS) were utilised to construct thin films using layer-by-layer (LbL) electrostatic deposition technique. A series of graphene-based thin films were made by alternating layers of either graphene-SDS with polycations (PEI or PAH) or graphene-CTAB with polyanions (PSS). Also, graphene-phthalocyanine composite films were produced by alternating layers of graphene-CTAB with tetrasulfonated nickel phthalocyanine. Graphene-surfactant LbL films exhibited good electric conductivity (about 0.1 S/cm) of semiconductor type with a band gap of about 20 meV. Judging from UV-vis spectra measurements, graphene-phthalocyanine LbL films appeared to form joint π-electron system. Gas sensing testing of such composite films combining high conductivity of graphene with the gas sensing abilities of phthalocyanines showed substantial changes (up to 10%) in electrical conductivity upon exposure to electro-active gases such as HCl and NH3.

    Item Type: Article
    Research Institute, Centre or Group - Does NOT include content added after October 2018: Materials and Engineering Research Institute > Thin Films Research Centre > Electronic Materials and Sensors Research Group
    Identification Number:
    Page Range: 04001
    Depositing User: Margaret Boot
    Date Deposited: 20 Apr 2017 16:02
    Last Modified: 18 Mar 2021 04:07

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