Highly Sensitive Ultrathin Flexible Thermoplastic Polyurethane/Carbon Black Fibrous Film Strain Sensor with Adjustable Scaffold Networks

• 作者: Xin Wang Xianhu Liu Dirk W.Schubert
• 来源期刊: 纳微快报（英文）
• 年，卷（期）: 2021,（4）
• 页码范围: 159-177
• 页数: 19页
• 语种: 英文

摘要

In recently years, high-performance wearable strain sen-sors have attracted great attention in academic and industrial. Herein, a conductive polymer composite of electrospun thermoplastic polyure-thane (TPU) fibrous film matrix-embedded carbon black (CB) particles with adjustable scaffold network was fabricated for high-sensitive strain sensor. This work indicated the influence of stereoscopic scaffold net-work structure built under various rotating speeds of collection device in electrospinning process on the electrical response of TPU/CB strain sensor. This structure makes the sensor exhibit combined characters of high sensitivity under stretching strain (gauge factor of 8962.7 at 155％ strain), fast response time (60 ms), outstanding stability and durability (> 10,000 cycles) and a widely workable stretching range (0–160％). This high-performance, wearable, flexible strain sensor has a broad vision of application such as intelligent terminals, electricalskins, voice measurement and human motion monitoring. Moreover, a theoretical approach was used to analyze mechanical property and a model based on tunneling theory was modified to describe the relative change of resistance upon the applied strain. Meanwhile, two equations based from this model were first proposed and offered an effective but simple approach to analyze the change of number of conductive paths and distance of adjacent conductive particles.