用于高性能应变传感的可生物降解聚合物复合材料中由银修饰多壁碳纳米管构建的三维导电网络

文献信息

中文摘要

传统导电薄膜如氧化铟锡（ITO）存在难以降解和回收的环境问题，而可生物降解的聚丁二酸丁二醇酯（PBS）则受限于其固有的较差导电性，使其不适合直接应用于柔性电子器件。为应对这一挑战，本研究通过混酸改性、银离子修饰和原位溶液聚合，构建了具有三维导电网络的Ag-aMWCNTs/TSPANI/PBS三元复合导电薄膜，并系统研究了其结构、性能及传感应用。结果表明，该复合体系为物理共混，Ag-aMWCNTs的引入未改变PBS的晶体结构。然而，所形成的导电网络有效限制了分子链运动，并作为成核剂显著增强了复合材料的热稳定性和结晶性能。当Ag-aMWCNT含量为3%时，导电薄膜在导电性、力学性能和降解性能方面表现出最佳的综合平衡。电荷转移电阻低至1.183 × 106 Ω，在土壤和酶环境中的降解率分别为25.84%和26.37%。该导电薄膜对呼吸、吞咽、关节弯曲和循环按压表现出灵敏且稳定的周期性电流响应，在可降解柔性传感领域展现出良好的应用前景。

英文摘要

Traditional conductive films such as indium tin oxide (ITO) suffer from the environmental issue of being difficult to degrade and recycle, whereas biodegradable poly(butylene succinate) (PBS) is limited by its intrinsically poor electrical conductivity, making it unsuitable for direct application in flexible electronic devices. To address this challenge, this study constructed Ag-aMWCNTs/TSPANI/PBS ternary composite conductive films with a three-dimensional conductive network through mixed acid modification, silver ion decoration, and in situ solution polymerization, and systematically investigated their structure, properties, and sensing applications. The results indicate that the composite system is a physical blend, and the introduction of Ag-aMWCNTs does not alter the crystal structure of PBS. However, the formed conductive network effectively restricts molecular chain movement and acts as a nucleating agent, significantly enhancing the thermal stability and crystallization performance of the composites. When the Ag-aMWCNT content is 3%, the conductive film exhibits the best overall balance of electrical conductivity, mechanical properties, and degradation performance. The charge transfer resistance is as low as 1.183 × 106 Ω, with degradation rates of 25.84% and 26.37% in soil and enzymatic environments, respectively. The conductive films show sensitive and stable periodic current responses to respiration, swallowing, joint bending, and cyclic pressing, demonstrating promising application prospects in the field of degradable flexible sensing.