Fully printed all-resistive dual-mode sensor with ultra-low temperature coefficient of resistance for crosstalk-free detections of pressure and humidity

Hongliang Ma, Fangcheng Si, Chang He, Xinyu Wang, Jie Ding*, Wendong Zhang, Xuge Fan

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

Humidity-pressure dual-mode sensor has attracted much attention for its promising applications in health monitoring, human- machine interaction (HMI), and aerospace. Nevertheless, it is still a great challenge to realize humidity-pressure dual-mode sensors without temperature interference on flexible substrate by a simple and fast method. Here, a fully screen-printed flexible humidity-pressure dual-mode sensor is prepared by using multi-walled carbon nanotubes (MWCNTs) as conductive fillers and graphene oxide (GO) and ethyl cellulose (EC) as binders. The prepared dual-mode sensor not only exhibits an ultra-low temperature coefficient of resistance (TCR = 0.182 %°C−1), excellent decoupling capability, good humidity responsivity (35.92 %, −ΔI/I0), wide humidity detection range (22–92 % RH), and fast humidity response/recovery time (52.19/47.55 s), but also shows high pressure cycling stability (1200 cycles), good pressure sensitivity (S = −1.582 % kPa−1) as well as fast pressure response time (82.7 ms). Furthermore, the independent sensing unit of the dual-mode sensor can be flexibly extended into the array for dual-terminal sensing without temperature interference. The results demonstrate that the dual-mode sensor has superior sensing performance and decoupling capability and shows great potential in multifunctional simultaneous sensing scenarios.

Original languageEnglish
Article number159394
JournalChemical Engineering Journal
Volume505
DOIs
Publication statusPublished - 1 Feb 2025

Keywords

  • Carbon nanotubes
  • Conductive inks
  • Graphene oxide
  • Humidity-pressure dual-mode sensors
  • Sensor arrays

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Ma, H., Si, F., He, C., Wang, X., Ding, J., Zhang, W., & Fan, X. (2025). Fully printed all-resistive dual-mode sensor with ultra-low temperature coefficient of resistance for crosstalk-free detections of pressure and humidity. Chemical Engineering Journal, 505, Article 159394. https://doi.org/10.1016/j.cej.2025.159394