3D MXene‐Based Flexible Network for High‐Performance Pressure Sensor with a Wide Temperature Range

Abstract

With the increasing popularity of smart wearable devices, flexible pressure sensors are highly desired in various complex application scenarios. A great challenge for existing flexible pressure sensors is to maintain high sensitivity over a wide temperature range, which is critical for their applications in harsh environments. Herein, a flexible piezoresistive sensor made of polyetherimide (PEI) fibrous network evenly covered with MXene nanosheets is reported to construct conductive pathways, showing ultrahigh sensitivity over a wide temperature range from −5 °C (sensitivity of 80 kPa −1 ) to 150 °C (20 kPa −1 ), low detection limit of 9 Pa, fast response time of 163 ms, outstanding durability over 10 000 cycles at room temperature, 2000 cycles at 100 °C and 500 cycles at −5 °C. The pressure sensor can monitor various human activities in real-time, apply to human-machine interaction, and measure pressure distribution. It also can sensitively respond to external mechanical stimuli at 150 °C and extremely low temperature (in liquid nitrogen). Moreover, the fibrous network exhibits an excellent Joule heating performance, which can reach 78 °C at an applied voltage of 12 V. Thus, the piezoresistive sensor has considerable potential for wearable garments and personal heating applications in harsh temperature conditions.

Pressure Sensor Based on a Lumpily Pyramidal Vertical Graphene Film with a Broad Sensing Range and High Sensitivity

“…The results show that LPV-5 presents stable responses with excellent repeatability. Figure d shows a high sensitivity response over a wide response range compared to reported pressure sensors, demonstrating the supereminent sensing properties of our LPV-5 sensor. − …”

Self-Healing Flexible Pressure Sensor for Human Motion Detection Based on Silver-Nanoparticle-Modified Polyimide Membranes

“…Figure and Table S1 show the sensing performance comparison between the fabricated flexible pressure sensor and other high-performance piezoresistive sensors reported in the literature. ,,,− It is found that most pressure sensors cannot achieve high sensitivity and wide linear range simultaneously through material selection and structural design, exhibiting a trade-off between these two properties. In this work, the PI@Ag sensors possess both high sensitivity (197 kPa –1 ) in a medium-pressure region (10–20 kPa) as well as relatively high sensitivity (13.73 kPa –1 and 47.6 kPa –1 ) in the low- (100 Pa–10 kPa) and high-pressure regions (20–50 kPa).…”

Flexible and Simply Degradable MXene–Methylcellulose Piezoresistive Sensor for Human Motion Detection

“…Flexible pressure sensors, which exhibit excellent real-time sensing, portability, and high integration, have showing promising applications in human motion detection, electronic skin, human–computer interaction, etc. − Depending on the sensing mechanism, flexible pressure sensors could be broadly divided into four types: piezoelectric, , piezoresistive, − capacitive, − and triboelectric. , Among them, piezoresistive sensors show various advantages of simple fabrication, low cost, easy signal acquisition, and high sensitivity. Although piezoresistive sensors have made great strides, it is still a great challenge to achieve both high sensitivity and benign stability simultaneously for subtle or enormous human body movement (e.g., pulse, joint flexion, etc.…”