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Edge selective gas detection using Langmuir films of graphene platelets

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posted on 2023-06-09, 13:37 authored by Sebastian Nufer, Matthew LargeMatthew Large, Alice KingAlice King, Sean OgilvieSean Ogilvie, Adam Brunton, Alan DaltonAlan Dalton
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.

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 Interfaces

ISSN

1944-8244

Publisher

American Chemical Society

Issue

25

Volume

10

Page range

21740-21745

Department affiliated with

  • Physics and Astronomy Publications

Research groups affiliated with

  • Materials Physics Group Publications

Full text available

  • Yes

Peer reviewed?

  • Yes

Legacy Posted Date

2018-06-04

First Open Access (FOA) Date

2019-06-01

First Compliant Deposit (FCD) Date

2018-06-04

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