Abstract An entangled multiwalled carbon nanotube film (Buckypaper) embedded in a polyurethane membrane was integrated into a glass fiber reinforced epoxy composite by means of a vacuum infusion to become a part of the composite and to give it a strain self-sensing functionality. In order to increase the strain sensing, pristine nanotubes were either oxidized by KMnO4 or Ag particles were attached to their surfaces. Moreover, the design of the carbon nanotube/polyurethane sensor allowed a formation of a film of micro-sized cracks, which increased its reversible electrical resistance and resulted in an enhancement of the strain sensing. Prestaining of the sensor with Ag-decorated nanotubes increased its sensitivity to strain, which was quantified by a gauge factor, more than hundredfold in comparison with the sensor with pristine nanotubes. The tests revealed that the integrated strain sensing exhibited a long-term electromechanical stability, which was linked to the level of strain in the host glass fiber/epoxy composite.

中文翻译：

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用于变形检测的具有集成碳纳米管层的玻璃纤维/环氧树脂复合材料

摘要 嵌入聚氨酯膜的缠结多壁碳纳米管薄膜（Buckypaper）通过真空灌注集成到玻璃纤维增​​强环氧树脂复合材料中，成为复合材料的一部分，并赋予其应变自感应功能。为了增加应变传感，原始纳米管要么被 KMnO4 氧化，要么在它们的表面附着 Ag 颗粒。此外，碳纳米管/聚氨酯传感器的设计允许形成微裂纹膜，这增加了其可逆电阻并导致应变传感的增强。与带有原始纳米管的传感器相比，用银装饰的纳米管对传感器进行预染色提高了其对应变的敏感性，应变是通过应变系数量化的，超过一百倍。