Abstract Chitosan (CS)/carbon black (CB) composite sponges with high electrical conductivity and strain sensing sensitivity are prepared by combining solution-mixing and freeze-drying techniques. CB nanoparticles with diameter of ~ 40 nm play the role of a conductive component in the CS/CB composites. CB can form a continuous filler network in CS, which leads to the increase in viscosity and shear modulus. When writing and drying the CS/CB conductive ink, conductive tracks are obtained. With the increase in CB content, the density, electrical conductivity, compressive properties, and thermal stability of CS sponges are improved. The X-ray diffraction and Fourier transforms infrared spectroscopy results show CB are successfully compounded into CS matrix. The addition of CB leads to a slight decrease in the porosity of CS sponges. Sensing performances of CS/CB composite sponges are investigated by detecting various human activities including pronouncing, breathing, and joint bending. CS/CB composite sponges show good sensitivity and stability after several hundred loops. CS/CB composite sponges combine the advantages of low-cost, easy fabricating process, flexible, and high performance, which make them show great potentials in highly sensitive strain sensor.

中文翻译：

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基于壳聚糖/炭黑复合海绵的高性能应变传感器

摘要 结合溶液混合和冷冻干燥技术制备了具有高导电性和应变传感敏感性的壳聚糖（CS）/炭黑（CB）复合海绵。直径约 40 nm 的 CB 纳米粒子在 CS/CB 复合材料中起到导电组分的作用。CB可以在CS中形成连续的填料网络，从而导致粘度和剪切模量的增加。CS/CB导电油墨在书写和干燥时，得到导电轨迹。随着CB含量的增加，CS海绵的密度、导电性、压缩性能和热稳定性均得到改善。X射线衍射和傅里叶变换红外光谱结果表明CB成功复合到CS基质中。CB 的加入导致 CS 海绵的孔隙率略有下降。通过检测各种人类活动，包括发音、呼吸和关节弯曲，研究 CS/CB 复合海绵的传感性能。CS/CB 复合海绵经过数百次循环后表现出良好的灵敏度和稳定性。CS/CB复合海绵结合了低成本、易加工、柔性和高性能等优点，使其在高灵敏度应变传感器中显示出巨大的潜力。