银纳米线/聚乙烯醇–海藻酸钠双网络导电有机水凝胶的制备与传感性能

Silver Nanowire/Polyvinyl Alcohol-Sodium Alginate Double-Network Conductive Organohydrogel: Preparation and Sensing Performance

摘要: 针对传统导电材料柔韧性差及单一网络水凝胶力学性能不足的问题，设计并制备了一种负载银纳米线(AgNWs)的聚乙烯醇(PVA)/海藻酸钠(SA)双网络导电有机水凝胶(PSAG)。结果表明，当AgNWs浓度为2.0 mg/mL时，PSAG-2综合性能最优，断裂伸长率达520.33%，断裂应力为235.35 kPa，电导率为0.1935 S/m。该有机水凝胶响应时间和恢复时间分别为133 ms和147 ms，在0%~50%应变范围内灵敏度因子为0.99，电阻–应变响应呈现高度线性，可分辨0.5%微小形变，并成功应用于人体关节运动监测，在柔性可穿戴传感器领域具有广阔应用前景。

Abstract: A silver nanowire (AgNWs)-loaded polyvinyl alcohol (PVA)/sodium alginate (SA) double-network conductive organohydrogel (PSAG) was designed and prepared to address the poor flexibility of traditional conductive materials and the insufficient mechanical strength of single-network hydrogels. The dual-network structure was constructed via freeze-thaw physical crosslinking combined with Ca²⁺ ionic crosslinking, followed by solvent replacement with glycerol. The effects of AgNWs concentration on mechanical properties, conductivity, and sensing performance were systematically investigated. The optimal PSAG-2 sample (AgNWs 2.0 mg/mL) exhibits an elongation at break of 520.33%, tensile stress of 235.35 kPa, and conductivity of 0.1935 S/m. Its response and recovery times are 133 ms and 147 ms, respectively, with a gauge factor of 0.99 within 0%~50% strain, and the ability to detect micro-deformations as low as 0.5%. The successful application in human joint motion monitoring indicates its great potential in flexible wearable sensors.