1成果简介
　　在柔性传感领域，开发兼具高机械强度与高电阻响应性的复合纸基传感器具有挑战性。本文，沈阳航空航天大学邹爱丽 教授、王共冬 教授等在《ACS Appl. Mater. Interfaces》期刊发表名为“Flexible Paper-Based Piezoresistive Sensors Based on Aramid Nanofibers and Carbon Nanotubes”的论文，研究提出了一种芳纶纳米纤维（ANF）/碳纳米管（CNT）复合纸基压阻传感器的制备策略。通过引入OP-10表面活性剂辅助研磨工艺，有效提升了CNT的分散性并保护其结构完整性。碳纳米管的优异电学特性，结合芳纶纳米纤维的多孔框架结构与可控变形能力，构筑出具有压阻响应的柔性传感材料，可监测外部压力刺激。
　　研究表明，当ANF质量分数优化至25 wt%时，复合纸的电导率达到1135.1 S/m的峰值，面电阻降至23.5 Ω/sq，表明其导电网络达到最佳协同状态。该传感器在宽压力范围内展现出优异灵敏度（最大灵敏度达0.0304 kPa⁻¹），响应与恢复时间迅速（分别为320毫秒和230毫秒），并在循环加载过程中保持卓越稳定性与耐久性（经受超过6000次压缩循环）。此外，该ANF/CNT柔性纸基压阻传感器可监测人体运动及复合材料构件弯曲状态，在电子皮肤、可穿戴智能健康监测设备及人机交互等领域具有重要应用潜力。
　　2图文导读 

　　图1. (a) Schematic diagram of the fabrication process for ANF/CNT flexible paper-based sensors. (b) Image of ANF/CNT composite paper. (c) Image of the paper cut into 20 × 10 mm2 specimens. (d) Piezoresistive sensor assembled from the ANF/CNT composite paper. (e) Schematic diagram of the sensor assembly.

　　图2. (a) Surface SEM image of the ANF/CNT composite paper. (b) SEM image of the surface microstructure of the composite paper. (c) Magnified image of the internal skeletal structure of the composite paper. (d) Cross-sectional SEM image of the composite paper with a thickness of 150 μm. (e) SEM image of the cross-sectional microstructure of the ANF/CNT composite paper. (f) Magnified SEM image of the cross-sectional microstructure details of the ANF/CNT composite paper.

　　图3. (a) Relationship between ANF mass fraction and specific surface area mass loading of composite paper. (b) Stress–strain curves of a series of ANF/CNT composite papers. (c) Mechanical strength of a series of ANF/CNT composite papers. (d) Sheet resistance and electrical conductivity curves of a series of ANF/CNT composite papers. (e) Comparison of |ΔR/R0| between OP-10 grinding and SDBS dispersion for ANF/CNT composite paper under the same load. (f) Sensitivity comparison of ANF/CNT composite paper under the corresponding load.

　　图4. (a) Piezoresistive characteristics of the ANF/CNT piezoresistive sensor. (b) Schematic diagram of the structural changes during the compression process of the ANF/CNT piezoresistive sensor. (c) Relationship between the relative resistance change ΔR/R0 and applied pressure. (d) Comparison of thickness and electrical conductivity performance of recently published piezoresistive sensors.

　　图5. (a) Current–voltage (I–V) curves of ANF/CNT composite paper under different pressures. (b) Current changes induced by resistance variations of the sensor. (c) Piezoresistive characteristics of ANF/CNT composite paper under cyclic loading of 55 kPa at 2 mm/min. (d) Relative resistance change of ANF/CNT composite paper under different pressures. (e) Response and recovery times of ANF/CNT composite paper. (f) ΔR/R0 of the piezoresistive sensor over approximately 6000 cycles under 50 kPa loading/unloading pressure.

　　图6. (a) Response of the piezoresistive sensor during human finger joint testing. (b) Response during walking. (c) Response during finger pressing and holding. (d) Response during grasping behavior.
　　3小结
　　综上所述，本研究成功开发出兼具高机械强度与优异压阻响应性能的ANF/CNT复合纸基传感器。通过OP-10表面活性剂辅助研磨工艺优化碳纳米管分散性，并结合ANF多孔骨架的可控变形能力，实现了导电网络与机械性能的协同增强。实验表明，当ANF质量分数为25%时，复合纸展现出最佳电学性能（电导率1135.1 S/m，面电阻23.5 Ω/sq）。其独特的压阻效应在宽压力范围内呈现超高灵敏度（0.0304 kPa⁻¹）。该传感器在循环加载下表现出优异的稳定性和耐久性，对不同压力刺激产生可重复的电阻响应。应用测试（包括步态检测、指尖触压及水杯掌握）表明，制备的ANF/CNT纸基压阻传感器在电子皮肤、健康监测及人机交互等领域具有广阔应用前景。
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