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Detection of acetone vapours using solution-processed tin oxide thin-film transistors

Miller, Lauren R.; Borthwick, Robert J.; dos Santos, Paloma L.; Chaudhry, Mujeeb U.

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Lauren Miller
PGR Student Doctor of Philosophy


Abnormal concentrations of volatile organic compounds (VOCs) in human breathe can be used as disease-specific biomarkers for the non-invasive diagnosis of medical conditions, such as acetone for diabetes. Solution-processed bottom gate top contact metal oxide thin-film transistors (TFTs) are used to detect acetone vapours, as part of a proof-of-concept study. The effect of increasing annealing temperature (T) and channel length (L) on electrical and sensing performance are explored. Drain current (Ids) increases following exposure as acetone undergoes a redox reaction with the adsorbed oxygen species on the semiconductor surface, which results in free electrons being released back into the conduction band. Responsivity (R) is maximized at negative bias (Vgs < 0). For L = 50 μm, the peak R of the TFT annealed at 450 °C is three times greater than that of the TFT annealed at 350 °C, with Vgs = − 37.5 V and − 33 V, respectively.

Journal Article Type Article
Acceptance Date Jan 4, 2023
Online Publication Date Jan 13, 2023
Publication Date 2023-07
Deposit Date Feb 8, 2023
Publicly Available Date Feb 8, 2023
Journal MRS Advances
Electronic ISSN 2059-8521
Publisher Springer
Peer Reviewed Peer Reviewed
Volume 8
Pages 440–445
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