丝绸2024，Vol.61Issue(4)：34-42,9.DOI:10.3969/j.issn.1001-7003.2024.04.005
蚕丝基柔性压力传感器的制备及其性能研究
Study on the preparation and performance of silk-based flexible pressure sensors
摘要
Abstract
Wearable electronic devices are portable gadgets worn either directly on the body or embedded in clothing or accessories.They offer functionalities across several domains such as medical health,outdoor sports,video and audio entertainment.Advancements in science and technology have led to electronic components being combined with flexible substrates,facilitating the development of wearable electronics in a more flexible and lightweight direction.This is beneficial to enhancing individuals'quality of life.Flexible wearable technology offers significant advantages such as flexibility,easy deformation,and good biological adaptability.However,there are also issues such as low sensitivity,limited detection range,and weak reliability resulting from environmental interference.The flexible pressure sensor plays a significant role in pressure detection within these devices.Therefore,the key to the development of flexible wearable devices lies in the advancement of flexible pressure sensors with outstanding performance. Flexible pressure sensors merge the suppleness of wearable materials with the electrical activity of electronic components,and can be attached to irregular surfaces to efficiently detect the pressure on the surface of objects.The selection of substrates and conductive materials will have a direct impact on the sensing performance of the flexible pressure sensor.Silk is a biological material with a lengthy history,possessing exceptional tensile strength and toughness,biocompatibility,biodegradability,and effortless processing,making it an ideal material for flexible sensors.Based on the features of silk processing and molding,it can be categorized into natural silk-based materials,regenerated silk protein materials,and silk primary fibers and aggregates.Consequently,in this study,three types of silk materials including silk fabric,flat silk cocoon,and electrospun silk fibroin film are selected as flexible substrates to develop the flexible sensors.Polyaniline(PANI),a unique conductive polymer,exhibits electrical conductivity when acid-doped and oxidized;however,it lacks conductivity when either completely oxidized or completely reduced.The gas-liquid interface polymerization process restricts the synthesis of PANI to the two-phase interface,ensuring controlled reaction degree to prevent over-oxidization of aniline.Additionally,it prevents secondary growth,resulting in PANI that exhibits uniform morphology. Herein,on the basis of the above analysis,the gas-liquid interface polymerization method was utilized to achieve in-situ growth of PANI on silk fabric,flat silk cocoon,and electrospun silk fibroin film,prepare a flexible substrate with PANI as an active conductive substance and assemble it into a flexible pressure sensor,so as to explore the changes in the properties of silk materials before and after the gas-liquid interface polymerization and the performance of the flexible pressure sensor based on silk.This study presents a novel approach and theoretical foundation for creating wearable electronic devices with optimal performance,safety,dependability,and effortless portability. The study demonstrates that among the three types of silk-based flexible pressure sensors,the SFP sensor has the largest pressure sensing range(16.27-504.79 kPa),the tensile deformation can reach 20％,while the sensitivity is only 0.001 29 kPa-1.The sensitivity of the ESFP sensor is the highest(0.013 76 kPa-1),but the tensile deformation ability is poor,only being 2.3％.The pressure detection sensitivity of the SFCP sensor is slightly higher than that of the SFP sensor,reaching 0.001 34 kPa-1,and the linear detection range is 9.8-87.6 kPa. The developed silk-based flexible pressure sensor has a good application prospect in the field of motion detection,but it still requires external power supply,which will limit the flexibility and convenience of wearable devices.Therefore,the future research direction can be to combine the silk-based flexible pressure sensor developed in this study with self-powered devices and develop an integrated intelligent detection system.This can provide a broader perspective for intelligent pressure detection.关键词
蚕丝织物/平板丝/静电纺丝素膜/聚苯胺/气液界面结合/柔性压力传感器Key words
silk fabric/flat silk cocoon/electrospun silk fibroin film/polyaniline/gas-liquid interface bonding/flexible pressure sensor分类
轻工纺织引用本文复制引用
刘嘉琪,汪宇佳,王胜男,代方银,李智..蚕丝基柔性压力传感器的制备及其性能研究[J].丝绸,2024,61(4):34-42,9.基金项目
重庆市教育委员会科学技术研究项目(KJQN202100203) （KJQN202100203）
大学生创新创业训练计划项目(X202310635299) （X202310635299）
