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Open AccessArticle

Scotch Tape Optical Vapor Sensor for Ethanol–Methanol Mixtures

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Institute for Optoelectronic Systems and Microtechnology (ISOM), ETSI Telecomunicación, Universidad Politécnica de Madrid, Ciudad Universitaria s/n, 28040 Madrid, Spain
2
Department of Photonics and Bioengineering (TFB), ETSI Telecomunicación, Universidad Politécnica de Madrid, Ciudad Universitaria s/n, 28040 Madrid, Spain
Sensors 2019, 19(24), 5381; https://doi.org/10.3390/s19245381
Received: 13 November 2019 / Revised: 29 November 2019 / Accepted: 4 December 2019 / Published: 6 December 2019
(This article belongs to the Special Issue Scattering-Based Techniques for Sensing Applications)
A simple optical vapor sensor based on conventional Scotch adhesive tape, for analyzing ethanol–methanol mixtures, is proposed and demonstrated. The sensing signal relies on the variation of optical power transmitted through the tape, resulting from the response of the adhesive material to vapor sorption. The optical sensor exhibits high selectivity for ethanol vapor over methanol vapor. When exposed to vapors from ethanol–methanol liquid mixtures, the sensor shows a linear detection range of 0–100 vol%, and detection limits of 8.8 vol% ethanol and 17.6 vol% methanol. Repeatability, reproducibility, reversibility, and sensitivity to other volatile organic compounds are also studied. View Full-Text
Keywords: ethanol; methanol; optical sensor; scattering; Scotch tape; vapor sensor ethanol; methanol; optical sensor; scattering; Scotch tape; vapor sensor
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MDPI and ACS Style

Angulo Barrios, C. Scotch Tape Optical Vapor Sensor for Ethanol–Methanol Mixtures. Sensors 2019, 19, 5381.

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