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, 10 (25). pp. 21740-21745. 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 |
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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: | 12 Jul 2019 16:00 |
URI: | http://sro.sussex.ac.uk/id/eprint/76296 |
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📧 Request an updateProject Name | Sussex Project Number | Funder | Funder Ref |
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Enabling Excellence - Graphene based nanomaterials four touchscreen technologies: Comprehension, Commerce and Communication | G1865 | EUROPEAN UNION | 642742 |