载银聚乳酸纳米纤维复合面料传感器的制备与表征

Preparation and characterization of nano silver-embedded PLA nanofiber fabric sensor

聚乳酸(PLA)纳米纤维摩擦电材料具有良好的生物相容性和可降解性,但其驻极后易吸附细菌等微生物,影响面料耐久性和穿戴者健康安全。以PLA为保护剂原位合成纳米银溶液,所制备纳米银粒径集中于0~5 nm和10~25 nm。将上述溶液经静电纺丝得到载银PLA纳米纤维膜,纤维膜直径由纯PLA纳米纤维的0.7~1.4μm降至0.4~0.7μm。载银PLA纳米纤维膜与导电织物复合后,面料的抗菌性能随PLA纳米银含量的增加而提高,最佳银质量分数为300 mg/kg,对E.coli和S.aureus的抑菌率均大于99.9%。复合面料摩擦电性能随纳米银含量增加先增加后降低,银质量分数为300 mg/kg,开路电压(VOC)峰值提高15.33%。研究表明摩擦电最佳条件为:接触频率2.0 Hz、接触压力12250 N/m^(2),相应VOC最高为99.47 V,短路电流(ISC)峰值最高为1.17μA,最高输出功率为129.35 mW/m^(2)。复合面料在监测人体运动信号方面具有良好的灵敏度。

Polylactic acid(PLA)nanofiber-based triboelectric electret materials have good biocompatibility and degradability,but they are often prone to adsorbing bacteria and other microorganisms through electrostatic ad⁃sorption,which may affect the durability of the fabric and the health and safety of the wearer.In this study,sil⁃ver nanoparticles(AgNPs)is in-situ synthesized using PLA as the protective agent.The particle size is mainly in the range of 0-5 nm and 10-25 nm.The diameter of electro-spun PLA nanofiber membrane decreases from 0.7-1.4μm of pure PLA nanofibers to 0.4-0.7μm.PLA nanofiber composite sensing fabric is prepared by combining with a conductive fabric.The antibacterial properties of the composite fabric increase with the increase of the silver content.The optimal silver content is 300 mg/kg,with the antibacterial rates against E.co⁃li and S.aureus over 99.9%.The triboelectric performance of the composite fabric increases initially and then decreases with the addition of AgNPs.The VOC increases by 15.33%when the silver content is 300 mg/kg.The optimal triboelectricity conditions are the contact frequency of 2 Hz,the contact pressure of 12250 N/m^(2),re⁃sulting in a corresponding VOC of 99.5 V,ISC of 1.17μA,and peak output power of 129.35 mW/m^(2).The prepared composite fabric can be integrated into various parts of the human body,which can monitor human movement signals with good sensitivity.