电纺纳米纤维基柔性压力传感器的制备及性能研究  

Preparation of Cellulose Nanofiber-based Flexible Pressure Sensors via Electrospun and Its Performance

作　　者：李翠环 陈胜[1,2] 毛健贞 牟佳慧 邵自强 许凤[1] LI Cuihuan;CHEN Sheng;MAO Jianzhen;MU Jiahui;SHAO Ziqiang;XU Feng(Beijing Key Laboratory of Lignocellulosic Chemistry,Beijing Forestry University,Beijing 100083,China;State Key Laboratory of Biobased Material and Green Papermaking,Qilu University of Technology(Shandong Academy of Sciences),Jinan 250353,China;Beijing Engineering Research Center of Cellulose and Its Derivatives,Beijing Institute of Technology,Beijing 100081,China)

机构地区：[1]北京林业大学林木生物质化学北京市重点实验室,北京100083 [2]齐鲁工业大学(山东省科学院)生物基材料与绿色造纸国家重点实验室,山东济南250353 [3]北京理工大学北京市纤维素及其衍生材料工程技术研究中心,北京100081

出　　处：《林产化学与工业》2022年第5期1-7,共7页Chemistry and Industry of Forest Products

基　　金：北京林业大学热点追踪资助项目(2021BLRD07);生物基材料与绿色造纸国家重点实验室开放基金资助项目(GZKF202029)。

摘　　要：以醋酸纤维素(CA)为原料,利用静电纺丝技术制备醋酸纤维素纳米纤维(CANFs),脱乙酰化后得到纤维素纳米纤维(CNFs),再通过原位聚合吡咯构建复合导电纳米纤维(CNFs-PPy),结合纸电极组装柔性压力传感器。通过红外光谱、X射线衍射、扫描电镜对材料进行表征,联用万能材料试验机和电化学工作站研究传感器机电性能,结果表明:聚吡咯成功复合在纤维素纳米纤维表面,复合导电纳米纤维氮元素质量分数为24.8%;传感器在1~15 kPa压强载荷下的电流-电压曲线均保持良好的线性关系,相对电流变化率随压强增加而升高;传感器在低压强(0~0.99 kPa)范围内灵敏度高达1.77 kPa,在中压强(1.00~8.33 kPa)和高压强(8.53~15 kPa)范围内灵敏度分别为0.43和0.22 kPa;传感器具有优异的信号可靠性和稳定性,循环加载3 000次器件的传感信号仍保持稳定;该传感器可以实现对手指触碰等外界压力变化的实时监测,为绿色柔性电子的发展提供了新思路。Cellulose acetate nanofibers(CANFs)were prepared by electrospinning cellulose acetate(CA), followed by deacetylation to obtain cellulose nanofibers(CNFs). Subsequentially, in-situ polymerization of polypyrrole was perform to fabricate the conductive composite nanofibers(CNFs-PPy), which was combined with cellulose paper as a flexible substrate for assembling a flexible pressure sensor. The materials were characterized by FT-IR, XRD and SEM, and the mechanical and sensing performance of the devices were analyzed using a universal material testing machine and an electrochemical workstation. The results showed that polypyrrole was successfully coated on the surface of cellulose nanofibers, and the nitrogen content of composite nanofiber was 24.8%. The current-voltage curves of the sensor maintained a good linear relationship under 1-15 kPa pressure load, and the relative current change rate increased with increasing pressure. The sensitivity values of the sensor were up to 1.77 kPain the range of low pressure(0-0.99 kPa), 0.43 kPain the range of medium pressure(1.00-8.33 kPa) and 0.22 kPain high pressure(8.53-15 kPa), respectively. The sensor had excellent signal reliability and stability, i.e., the sensing signal remained stable after 3 000 cycles of loading. The sensor could realize the real-time monitoring of external pressure changes such as finger touch, which provided a new insights into the development of green electronics.

关 键 词：纤维素 静电纺丝 聚吡咯 柔性压力传感器 

分 类 号：TQ35[化学工程]