Edge selective gas detection using Langmuir films of graphene platelets

Nufer, Sebastian, Large, Matthew, King, Alice, Ogilvie, Sean Paul, Brunton, Adam and Dalton, Alan (2018) Edge selective gas detection using Langmuir films of graphene platelets. ACS Applied Materials and Interfaces. ISSN 1944-8244

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Abstract

Recent advances in large-scale production of graphene have led to the availability of solution processable platelets at the commercial scale. Langmuir-Schaefer (L-S) deposition is a scalable process for forming a percolating film of graphene platelets which can be used for electronic gas sensing. Here, we demonstrate the use of this deposition method to produce functional gas sensors, using a chemiresistor structure from commercially-available graphene dispersions. The sensitivity of the devices and repeatability of the electrical response upon gas exposure has been characterized. Raman spectroscopy and Kelvin probe force microscopy (KPFM) show doping of the basal plane using ammonia (n-dopant) and acetone (p-dopant). The resistive signal is increased upon exposure to both gases showing that sensing originates from the change in contact resistance between nanosheets. We demonstrate that Arrhenius fitting of the desorption response potentially allows measurements of the desorption process activation energies for gas molecules adsorbed onto the graphene nanosheets.

Item Type: Article
Schools and Departments: School of Mathematical and Physical Sciences > Physics and Astronomy
Research Centres and Groups: Materials Physics Group
Subjects: Q Science
Depositing User: Sean Paul Ogilvie
Date Deposited: 04 Jun 2018 10:50
Last Modified: 04 Jun 2018 10:51
URI: http://srodev.sussex.ac.uk/id/eprint/76296

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Project NameSussex Project NumberFunderFunder Ref
Enabling Excellence - Graphene based nanomaterials four touchscreen technologies: Comprehension, Commerce and CommunicationG1865EUROPEAN UNION642742