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

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.