纤维素电纺纳米纤维柔性表皮电极制备与性能  

Preparation and property of cellulose electrospun nanofibers-based flexible epidermal electrodes

作　　者：袁溶锴 黄欣悦 李鑫 许凤 Yuan Rongkai;Huang Xinyue;Li Xin;Xu Feng(School of Materials Science and Technology,Beijing Key Laboratory of Lignocellulosic Chemistry,Engineering Research Center of Forestry Biomass Materials and Energy,Beijing Forestry University,Beijing 100083,China)

机构地区：[1]北京林业大学材料科学与技术学院,林木生物质化学北京市重点实验室,林业生物质材料与能源教育部工程研究中心,北京100083

出　　处：《北京林业大学学报》2024年第9期132-140,共9页Journal of Beijing Forestry University

基　　金：北京市大学生创新创业训练计划(S202310022169);国家自然科学基金项目(22308027);国家资助博士后研究人员计划(GZB20230061);北京林业大学“5•5工程”科研创新团队(BLRC2023B01)。

摘　　要：【目的】为了解决当前可穿戴电极材料的生物不相容性、低响应集成特性等问题,本研究采用天然纤维素为原料,结合新型溶解技术与静电纺丝技术,通过原位聚合导电高分子制备纤维素电纺纳米纤维柔性表皮电极,并探究其在人体电信号监测领域的应用。【方法】将纤维素溶解于新型离子液体复合溶剂中,构建低黏度、长期稳定的纺丝液;采用室温静电纺丝法结合预凝固过程制备再生纤维素基电纺纳米纤维;通过与导电材料聚(3,4-乙烯二氧噻吩)-聚(苯乙烯磺酸盐)(PEDOT:PSS)复合进行纳米自组装,得到柔性表皮电极。采用扫描电镜、全自动比表面和孔隙度分析仪、C101气体渗透测试系统、傅里叶变换红外光谱仪、X射线晶体衍射仪表征电极的形貌特征和化学结构,采用万能材料试验机测试电极的拉伸性能和黏附力,采用电化学工作站检测电极阻抗,通过双导肌肉电模块及多道生理信号采集系统监测肌电图和心电图。【结果】纤维素电纺纳米纤维柔性表皮电极具有有序排列的网状结构和丰富的孔道结构,呈现纤维素Ⅱ晶型结构;当PEDOT:PSS体积分数为20%时,电极的拉伸性能和黏附性最优,即应变为9.8%,杨氏模量0.04 MPa,且对玻璃和猪皮的黏合力(分别为17.8、14.7 N/m)较高;电极在10−2~105 Hz范围内表现出低电极–皮肤电接触阻抗,且能够产生高质量的肌电和心电信号。【结论】本研究以天然纤维素和导电材料为主要构件,制备了一种具有柔性、透气性、自黏附性和低阻抗性能的可穿戴电极。该电极可用于人体电信号监测,为生物相容纤维素基可穿戴电极材料的构建提供了技术支撑。[Objective]In order to solve the problems of bio-incompatibility and low response integration of current wearable electrode materials,cellulose electrospun nanofiber based flexible epidermal electrode was prepared by natural cellulose as raw material,combining novel dissolution technology and electrospinning technology,and then in situ polymerizing conductive polymers.The electrode application in the field of human electrical signal monitoring was explored.[Method]Cellulose was dissolved in a novel ionic liquid composite solvent to construct a low-viscosity,long-term stable spinning solution.The regenerated cellulose-based electrospun nanofibers were prepared by room-temperature electrospinning combined with pre-coagulation process.Then,they were composite with poly(3,4-ethylenedioxythiophene)-poly(styrene sulfonate)(PEDOT:PSS)for nano-self-assembly to obtain flexible epidermal electrodes.The scanning electron microscopy,automatic specific surface and porosity analyzer,C101 gas penetration test system,Fourier transform infrared spectrometer,and X-ray diffractometer were used to characterize the morphology and chemical structure of the electrodes.The universal material testing machine was used to test the tensile properties and adhesion of electrodes.The electrochemical workstation was used to detect electrode impedance.The electromyography and electrocardiogram were monitored by dual conductivity muscle electrical module and multi-channel physiological signal acquisition system.[Result]The cellulose electrospun nanofibers based flexible epidermal electrode had an ordered network and rich pore structure,presenting a celluloseⅡcrystal structure.When the volume fraction of PEDOT:PSS was 20%,the tensile properties and adhesion of the electrode were optimal,that is,the strain was 9.8%,the Young’s modulus was 0.04 MPa,and the adhesion force to glass and pigskin(17.8 and 14.7 N/m,respectively)was high.The electrode exhibited a low contact impedance of electrode-skin in the range of 10−2−105 Hz.Moreover,it can ge

关 键 词：纤维素溶解 离子液体 静电纺丝 纳米纤维 表皮电极 电生理信号 

分 类 号：TQ351[化学工程]