Macromolecular Materials and Engineering (Apr 2024)

Soft and Stretchable Humidity‐Insensitive Thermoresistive Temperature Sensor with A Tensile Strain Modulated Sensitivity

  • Ahmed Albeltagi,
  • Jarkko Tolvanen,
  • Sagar R. Bhalerao,
  • Jari Hannu

DOI
https://doi.org/10.1002/mame.202300379
Journal volume & issue
Vol. 309, no. 4
pp. n/a – n/a

Abstract

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Abstract Soft and stretchable electronics represents a high potential paradigm shift in field of electronics, for example, in applications related to solar cells, organic displays, electronic skin, and wearable sensors. In this work, a soft and stretchable humidity‐insensitive thermoresistive sensor is developed using interdigitated electrodes made of silver‐plated nylon fabric coated with silver‐ink and a layer of poly(3,4‐ethylenedioxythiophene)–poly(styrene sulfonate) (PEDOT: PSS) embedded into elastomer. The mechanical and thermoelectrical properties of the soft sensor are characterized and analyzed. The fabricated soft sensor provides a combination of linear temperature sensitivity of 0.46% °C−1 with an R2 of 0.986 from 30 to 55 °C at 0% uniaxial tensile strain. It also exhibits excellent stability in environmental humidity ranging from ≈30% RH to ≈80% RH. The linear sensitivity is improved to 1.49% °C−1 by applying a 40% pre‐measurement stretch to the sensor. Due to its good temperature sensitivity (0.46 to 1.49% °C−1), excellent linearity (0.986), and high stretchability (≈125%), the soft and stretchable temperature sensor proves to be a very promising solution for wearable temperature sensing.

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