双螺旋结构摩擦电纳米纱线的制备及抗拉伸机理OA

Triboelectric nanofiber-based pressure-sensing yarns demonstrate broad application prospects in healthcare monitoring,human motion capture,and smart home interaction systems due to their efficient biomechanical energy collection,sensitive posture perception,and excellent flexibility.However,current triboelectric sensing systems are prone to interference from tensile strain and environmental factors(e.g.,temperature/humidity)during practical pressure detection,causing significant signal distortion.This critical bottleneck severely restricts their large-scale deployment in wearable scenarios.An ideal flexible pressure sensor must combine superior stretchability,biocompatibility,and mechanical stability to accommodate dynamic human contact,while crucially maintaining pressure signal independence and accuracy under high-strain conditions.Nevertheless,existing sensors often exhibit signal crosstalk induced by multi-physics coupling effects(e.g.,triboelectric-mechanical interplay)during stretching,further exacerbating application constraints and demanding targeted breakthroughs. To effectively address the aforementioned technical challenges,this paper innovatively proposes a design scheme for triboelectric nanofiber sensing yarns that integrates a core-sheath separation structure and an embedded helical configuration.During the preparation process:firstly,conjugate electrospinning technology is employed to coat polyvinylidene fluoride(PVDF)and nylon 11(PA-11)nanofiber layers with outstanding triboelectric properties onto the surface of highly conductive silver-plated nylon filaments,constructing core-sheath structured single yarns;subsequently,a precision twisting process is adopted to fabricate twisted yarns for enhanced structural stability and triboelectric response efficiency;differential wet spinning technology is utilized to uniformly encapsulate the twisted yarns in a highly elastic polyurethane matrix,forming one-dimensional sensing units with a self-assembled helical configuration.This core design efficiently activates the triboelectric effect under compression via the twisted structure,while the embedded helical configuration buffers mechanical stress and maintains structural integrity under tensile deformation,thereby achieving effective decoupled transmission of pressure and strain signals. Experimental test results show that the as-prepared triboelectric nanofiber sensing yarns exhibit excellent comprehensive performance:their breaking elongation exceeds 400％;within the tensile strain range of 0-100％,the strain interference suppression rate remains stably above 98％,which can effectively shield the interference of tensile conditions on pressure detection,presenting outstanding anti-tensile-interference performance and stable,reliable pressure-response characteristics.This study not only provides an efficient material platform and key technical route for the next generation of highly robust wearable sensing systems,but also offers important technical insights and theoretical support for the development of anti-interference sensing systems in smart wearable devices.