高灵敏超压缩生物基炭化材料柔性压力传感器的制备及其性能

为获得灵敏度高、响应范围广和环境友好的柔性力学传感器,以巴尔杉木为基材,采用自上而下的炭化木材技术,制备了聚氨酯/炭化木气凝胶复合导电材料,并利用聚氨酯浸泡处理方法提高炭化材料的压缩性和回弹性。使用扫描电子显微镜等仪器表征了炭化前后木气凝胶的表观结构、热稳定性、力电学性能及其柔性压力传感器的传感性能。结果表明,炭化木气凝胶具有独特的三维拱形层状结构,孔隙率达55.73%,且具有较高的热稳定性和可压缩性,其中质量分数为4%的聚氨酯/炭化木气凝胶具有良好的传感性能,在1~60 kPa的宽检测限下灵敏度达到61.02 kPa^-1,迟滞率低于4.87%,可重复性达10 000次循环。以该气凝胶为敏感材料构建的柔性压力传感器可应用于人体生理信号及运动行为的监测。

Preparation and performance of high sensitive ultra-compressed bio-based carbonized flexible pressure sensor

In order to obtain flexible mechanical sensors with high sensitivity,wide response range and environment-friendliness,the top-down carbonized wood technology was adopted to prepare polyurethane/carbonized wood aerogel composite conductive materials,with balsa fir as the base material.The compression and resilience of the carbonized materials were improved by soaking the materials in polyurethane.Scanning Electronic microscopy and other instruments were used to characterize the apparent structure,thermal stability,mechanical and electrical properties of wood aerogels before and after carbonization,as well as the sensing properties of flexible pressure sensors.The results show that the carbonized wood aerogel has a unique three-dimensional arched layer structure with a porosity of 55.73%and high thermal stability and compressibility.The 4%polyurethane/wood carbide aerogels have demonstrated good sensing properties,with the sensitivity being 61.02 kPa^-1,the hysteresis less than 4.87%,and the repeatability 10000 cycles under the wide detection limit of 1-60 kPa^-1.The flexible pressure sensor based on the aerogel can be used to monitor physiological signals and human movement behavior.