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

Viitala, T., Nabok, A., Walch, N.J., Dutton, S., Davis, Frank and Higson, Seamus P. J. (2017) Graphene-based LbL deposited films: further study of electrical and gas sensing properties. MATEC Web of Conferences, 98 (04001). pp. 1-4. ISSN 2261-236X

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Abstract

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-bylayer (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 electroactive gases such as HCl and NH3.

Item Type: Article
Additional Information: © The Authors, published by EDP Sciences, 2017
Subjects: T Technology > TA Engineering (General). Civil engineering (General)
T Technology > TP Chemical technology
Depositing User: Hannah Lynch
Date Deposited: 23 Aug 2019 14:38
Last Modified: 06 Sep 2019 09:53
URI: http://eprints.chi.ac.uk/id/eprint/4780

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