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2020 IEEE International Conference on Flexible and Printable Sensors and Systems (FLEPS), 2020

DOI: 10.1109/fleps49123.2020.9239568



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Flexible Strain Sensor with NFC Tag for Food Packaging

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This paper is available in a repository.

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In this work we present a polymer-based flexible strain sensor integrated with an NFC tag to detect strain by means of a visual LED indicator. The sensor was fabricated using conductive polymer poly (3,4-ethylenedioxythiophene) polystyrene sulfonate (PEDOT:PSS) as an active material inside a flexible and transparent polymer Polydimethylsiloxane (PDMS) microchannel. The strain sensor changes its resistance at different bending conditions, showing up to three order increase in resistance for $∼ 100$ bending. A custom-developed passive NFC tag with an LED connected in series to the strain sensor is powered from an NFC reader to detect strain in a semi-quantitative way. The light intensity of the LED indicator is modulated according to the strain level, showing maximum brightness $(∼ 67$ lux) for relaxed or no strain condition, and being almost OFF $(∼ 8$ lux) for the maximum strain condition. The potential application of the NFC-based strain sensor system in food package for spoilage detection is also presented.