Ultra-sensitive non-enzymatic ethanol sensor based on Reduced Graphene Oxide-Zinc Oxide composite modified electrode

Sha, Rinky and Puttapati, Sampath Kumar and Srikanth, Vadali VSS and Badhulika, Sushmee (2018) Ultra-sensitive non-enzymatic ethanol sensor based on Reduced Graphene Oxide-Zinc Oxide composite modified electrode. IEEE Sensors Journal (99). p. 1. ISSN 1530-437X

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In this work, we report a reduced Graphene Oxide (rGO)-Zinc Oxide (ZnO) composite based non-enzymatic ethanol sensor with an ultra-high sensitivity of 508.91 μAmM-1cm-2 which is, to the best of our knowledge, ~8 folds higher than previously reported electrochemical ethanol sensors. The rGO-ZnO composite was synthesized by a wet chemical method wherein the reduction of GO and intimate interfacial contact between ZnO NPs and rGO were achieved simultaneously. The sensing of ethanol was explicated by means of current-potential (I-V) technique. The sensor exhibited reproducible response with insignificant variations in current tested across multiple electrodes and responded linearly to ethanol in the range of 0.5-5 mM (R²=0.957). The sensor also showed lower limit of detection. The significant improvement in sensitivity is attributed to the improved surface activity and faster charge separation owing to formation of the nano-Schottky barrier at rGO-ZnO interface. This approach is beneficial as it eliminates the use of conducting binder along with the functional material for ethanol sensing. This ultra-sensitive, binder free rGO-ZnO based sensor offers a simple, low cost approach for ethanol detection in food, pharmaceutical, bio fuel industries and environmental analyses.

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IITH Creators:
IITH CreatorsORCiD
Badhulika, SushmeeUNSPECIFIED
Item Type: Article
Uncontrolled Keywords: Reduced Graphene oxide, ZnO, Electrochemical sensor, Ethanol sensor
Subjects: Electrical Engineering
Divisions: Department of Electrical Engineering
Depositing User: Team Library
Date Deposited: 22 Jan 2018 04:53
Last Modified: 22 Jan 2018 04:53
URI: http://raiith.iith.ac.in/id/eprint/3739
Publisher URL: http://doi.org/10.1109/JSEN.2017.2787538
OA policy: http://www.sherpa.ac.uk/romeo/issn/1530-437X/
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