acsami.8b05105.pdf (1.86 MB)
Edge selective gas detection using Langmuir films of graphene platelets
journal contribution
posted on 2023-06-09, 13:37 authored by Sebastian Nufer, Matthew LargeMatthew Large, Alice KingAlice King, Sean OgilvieSean Ogilvie, Adam Brunton, Alan DaltonAlan DaltonRecent 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.
Funding
Enabling Excellence - Graphene based nanomaterials four touchscreen technologies: Comprehension, Commerce and Communication; G1865; EUROPEAN UNION; 642742
History
Publication status
- Published
File Version
- Accepted version
Journal
ACS Applied Materials and InterfacesISSN
1944-8244Publisher
American Chemical SocietyExternal DOI
Issue
25Volume
10Page range
21740-21745Department affiliated with
- Physics and Astronomy Publications
Research groups affiliated with
- Materials Physics Group Publications
Full text available
- Yes
Peer reviewed?
- Yes
Legacy Posted Date
2018-06-04First Open Access (FOA) Date
2019-06-01First Compliant Deposit (FCD) Date
2018-06-04Usage metrics
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