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Quartz tuning fork based portable sensor for vapor phase detection of methanol adulteration of ethanol by using aniline-doped polystyrene microwires

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Abstract

The authors describe a sensor capable of detecting methanol adulteration of ethanol. The sensor is based on the use of quartz tuning forks (QTFs) that were functionalized with polymer wires made from a combination of polystyrene (PS) and aniline. Exposure to organic vapors causes the resonance frequency of the functionalized QTF to change, and this can be used to identify the type and concentration of the analyte. A mixture of methanol and ethanol vapors in varying concentrations was exposed to the QTF polymer system. The resulting shift in the resonance frequency of the QTF was firstly used to determine the concentration of alcohol vapor, which is reflected in the amount of shift. Secondly, the nature of change in resonance frequency was used to determine the type of alcohol exposed to the sensor. The sensitivity and selectivity of the sensors to ethanol and methanol vapors has been investigated. A portable hand-held prototype sensor has been developed which displays the percentage of two alcohols it is exposed to. It can detect ethanol adulteration where the methanol concentration is as low as 5%.

Spring loaded Quartz Tuning Fork sensors functionalized with polystyrene-aniline wires exhibit opposite responses (increase and decrease in frequency) to vapors of ethanol and methanol respectively.The methanol adulteration of ethanol solutions may thus be detected by sensing their vapors.

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Acknowledgements

SVP, SB and SSD would like to acknowledge the DIAT-DRDO project on nanomaterials for financially supporting the work.

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Authors and Affiliations

  1. Department of Applied Physics, Defence Institute of Advanced Technology, Girinagar, Pune, 411025, India

    S Abraham Sampson, Suresh Vaijnath Panchal, Atul Mishra & Suwarna S Datar

  2. Department of Applied Chemistry, Defence Institute of Advanced Technology, Girinagar, Pune, 411025, India

    Shaibal Banerjee

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  1. S Abraham Sampson
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  2. Suresh Vaijnath Panchal
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  3. Atul Mishra
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  4. Shaibal Banerjee
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  5. Suwarna S Datar
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Correspondence to Suwarna S Datar.

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Sampson, S.A., Panchal, S.V., Mishra, A. et al. Quartz tuning fork based portable sensor for vapor phase detection of methanol adulteration of ethanol by using aniline-doped polystyrene microwires. Microchim Acta 184, 1659–1667 (2017). https://doi.org/10.1007/s00604-017-2159-6

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