Flexible pressure sensor based on cigarette filter and highly conductive MXene sheets

Flexible and cost-effective MXene-cigarette filter (MCF) based pressure sensors are fabricated by dip-coating cigarette filters with Ti3C2Tx MXene nanosheets in the aqueous dispersion. The resultant MCF sensors exhibit fast response to compression, and show excellent cycling stability (2500 cycles at 10% compression strain) in the radial direction, which is attributed to the highly intrinsic conductivity of MXene sheets and the oriented structure of cigarette filter. Moreover, the MXene coated fibers in the MCF can be simply torn off with adhesive tape to prepare wearable film sensors for detecting both bending and compression. Due to the high sensitivity and flexibility, the sensor demonstrates excellent performance in monitoring human behavior.