Study On Piezoresistive Sensors Based On MXene Sphere/rGO Composites Aerogel

As the key device for transforming force signals to electrical signals,pressure sensors are gaining more and more attention with the popularity of smart wearable devices.In this thesis,we combined highly pressure-sensitive MXene/graphene composites materials with novel hollow-microsphere structure design in order to prepare a new piezoresistive pressure sensor.Compared with present piezoresistive sensors based on carbonaceous nanomaterials and aerogels,the device has decent improvements in pressure detection sensitivity and linear range.The key features of the device are as follows:（1）Extraordinary performance:The device exhibits high sensitivity(609 k Pa^-1for pressures ranging from 6.4 k Pa to 10 k Pa),broad linear sensing region（0–10 k Pa）,low detection limit（6 Pa）,short response time（232 ms）and good cycling stability（6000 cycling tests）.（2）Broad practical application:The device is capable of monitoring various human activities in real-time.Besides,multiple kinds of tiny grains are also discriminated by the device,demonstraing its superior sensing performance in low pressure regions.（3）Facile preparation process:The preparation process of the device comibines ice template method and sacificial template technique.By utilizing bulk MXene microspheres/re-duced graphene oxide composite aerogel as pressue-sensing materials and polyimide inter-digital electrodes as flexible substrates,the preparation process is simple,facile and ready for mass-production.