High sensitivity flexible paper temperature sensor and body-attachable patch for thermometers

Jin Woo Lee, Younguk Choi, Jaehoon Jang, Se Hyuk Yeom, Wanghoon Lee, Byeong Kwon Ju

Research output: Contribution to journalArticlepeer-review

27 Citations (Scopus)

Abstract

A highly sensitive, flexible, and wearable paper-based temperature sensor is fabricated using printing paper and poly(3,4-ethylenedioxythiophene):poly(4-styrenesulfonate) (PEDOT:PSS) solution. It exhibits a negative temperature coefficient and is implemented in a new band-like body-attachable thermometer. Compared to the polymer substrate, the use of hydrophilic and flexible paper substrate facilitates significantly superior sensitivity and simple fabrication. The paper sensor is fabricated by depositing PEDOT:PSS onto the paper with an 80 g base weight for 40 s, which is covered with a 50 μm film to protect it from humidity. This is followed by a heat treatment at 150 °C for 10 min. The paper sensor exhibited an electrical conductivity of 0.48 Ωcm−1 at room temperature with a linearity of 99.86 %. Remarkably, its sensitivity is 658.5 Ω/°C, which is 14 times higher than that of sensor with polyimide substrate (46 Ω/°C), for the body temperature range of 30–42 °C. The paper-based temperature sensor is implemented in a body-attachable patch for a wearable thermometer, which is simply connected with a circuit part for signal processing and the results are transferred to a phone via Bluetooth. The proposed inexpensive sensor is potentially useful for a wide range of flexible electronics and healthcare applications.

Original languageEnglish
Article number112205
JournalSensors and Actuators, A: Physical
Volume313
DOIs
Publication statusPublished - 2020 Oct 1

Bibliographical note

Funding Information:
This work was supported by a grant of the Korea Health Technology R&D program through the Korea Health Industry Development Institute (KHD) , funded by the Ministry of Health & Welfare, Republic of Korea (grant number HI18C0955 ). This study was also supported by the Brain Korea 21 Plus Project in 2020 . J.W. Lee and Y. Choi contributed equally to this work.

Funding Information:
This work was supported by a grant of the Korea Health Technology R&D program through the Korea Health Industry Development Institute (KHD), funded by the Ministry of Health & Welfare, Republic of Korea (grant number HI18C0955). This study was also supported by the Brain Korea 21 Plus Project in 2020. J.W. Lee and Y. Choi contributed equally to this work.

Publisher Copyright:
© 2020

Keywords

  • Conductive polymer
  • Flexible electronics
  • Paper
  • Sensor
  • Wearable devices

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Instrumentation
  • Condensed Matter Physics
  • Surfaces, Coatings and Films
  • Metals and Alloys
  • Electrical and Electronic Engineering

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