Flexible, scalable, and efficient thermoelectric touch detector based on PDMS and graphite flakes

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Abstract

This paper presents freestanding thermoelectric touch detectors consisting of graphite conductive flakes into a polydimethylsiloxane matrix. An optimal concentration of graphite flakes (45 wt%) lead to robust and homogeneous detectors that exhibited signal-noise ratio values up to 170 with rise and falling times below 1 s and 7 s, respectively. The detectors performance was stable over continuous operation and did not reveal significant degradation while bended under different curvature radii (45, 25 and 15 mm) and consecutive bending cycles. Moreover, the twist of the thermal gradient direction between the electrodes of the detector enables a Yes or No response which opens new usage possibilities. Therefore, this work provides an efficient way to develop robust, low-cost, and scalable thermal detectors with potential use in wearable technologies.

Original languageEnglish
Article number045018
JournalFlexible and Printed Electronics
Volume6
Issue number4
DOIs
Publication statusPublished - Dec 2021

Keywords

  • flexible technologies
  • low-cost fabrication
  • no substrates
  • PDMS/graphite flakes
  • scalable manufacturing
  • thermoelectric touch sensors

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