MATEC Web Conf.
Volume 98, 201716th International Conference on Organized Molecular Films (ICOMF16-LB16)
|Number of page(s)||4|
|Section||Graphene and carbon materials|
|Published online||08 February 2017|
Graphene-based LbL deposited films: further study of electrical and gas sensing properties
1 Sheffield Hallam University, Materials and Engineering Research Institute, Sheffield S11 7JN, UK
2 Department of Engineering and Applied Design, University of Chichester, PO21 1HR, UK
* Corresponding author: A.Nabok@shu.ac.uk
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.
© The Authors, published by EDP Sciences, 2017
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