Dielectric Sensor System Using TiO2 Nanotubes for Real-Time Detection of Methanol Contamination in Alcoholic Beverages
- 12 February 2020
- journal article
- research article
- Published by Institute of Electrical and Electronics Engineers (IEEE) in IEEE Transactions on Instrumentation and Measurement
- Vol. 69 (9), 6621-6629
- https://doi.org/10.1109/tim.2020.2971328
Abstract
In this article, a portable sensor system based on a TiO2 nanotube array is described for detecting methanol contamination in alcoholic beverages. TiO2 nanotubes were synthesized on a Ti substrate by using electrochemical anodization technique and Au contacts were deposited over TiO2 nanotubes by vacuum-assisted thermal evaporation technique. The TiO2 nanotube array was sandwiched in-between Ti and Au electrodes, which resulted in a capacitive-type structure of the sensor. The conductive and capacitive changes in the sensor operating at room temperature were then tested for pure ethanol, 10% and 25% methanol-contaminated ethanol, and pure methanol. The sensor exhibited a selective capacitive response toward all methanol-contaminated samples and recovered to its baseline capacitance value in less than 40 s. The dielectric sensor was then integrated with a 9-V, battery-driven, signal-processing circuit having a LED for notifying the information on methanol contamination in an alcoholic beverage. The integrated sensor system was able to detect 10%-100% methanol contamination in alcoholic beverages like whiskeys in less than 3 min.Keywords
Funding Information
- Science and Engineering Research Board (ECR/2015/000345)
- Department of Biotechnology, Government of West Bengal (BT/PR28727/NNT/28/1569/2018)
- Scheme for Promotion of Academic and Research Collaboration (SPARC) through the Government of India (SPARC/2018-2019/P1394/SL)
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