聚氨酯-碳纳米管@碲化铋复合气凝胶的制备及传感性能OA

With the rapid development of intelligent equipment such as bionic humanoid robots,flexible tactile sensors have attracted increasing attention for their bionic haptic behaviors similar to human fingers.However,the existing sensing materials used for assembling multimodal flexible tactile sensors still lack the high-selective response capabilities,resulting in the cross-interference phenomenon of various output signals,which is difficult to meet the lightweight and integrated requirements of microsystems.In this study,a new-style polyurethane-carbon nanotubes@bismuth telluride(WPU-CNT@Bi2Te3)hybrid aerogel was designed and prepared,which exhibits a maximum compressive strain of 60%and a compressive strength of 9.4 kPa via the optimization of component ratios.Furthermore,according to the independent sensing principles of the piezoresistive effect of CNTs to mechanical pressure stimuli,and the thermoelectric effect of Bi2Te3 to changes in the external temperature,this hybrid aerogel derived flexible tactile sensor achieves high sensitivity(GF value of-1.28 kPa-1,temperature response sensitivity of 1.2 K-1,and minimum response temperature difference of 0.4 K)and rapid response behaviors(response and recovery times of 0.14 and 0.18 s for pressure,optimal response time of 0.28 s for temperature)to temperature and pressure,with high sensing stability(no degradation after 1300 thermal cycles)and non-mutual interference behaviors,endowing the equipped robotic hand with the perception capability to recognize both the hardness and temperature of various objects.