可穿戴的光固化型高灵敏柔性应变传感器

柔性应变传感器具有良好的体表共形特性,在可穿戴医疗电子中备受关注。文章采用苯乙烯-马来酸酐(styrene-maleic anhydride, SMA)与氨基化多壁碳纳米管(aminoated multiwalled carbon nanotubes, aminoMWCNTs)的酰胺化反应,得到聚合物包裹的碳纳米管。以弹性棉线作为基材,先后浸渍进入低质量分数和高质量分数的酰胺化碳纳米管/UV胶混合液并进行紫外光固化,固化完成后通过预拉伸制备具有裂纹结构的超灵敏柔性应变传感器。结果表明,双应变层结合裂纹结构的设计方案使得该传感器具有宽的检测范围(0~40%应变)、高应变系数 $ G_{r}(0\sim13\%\text{应变},G_{r}=4\ 000) $、低检测限(0.2%应变)和良好的重复性(1 000次加/卸载循环)。该传感器对人体脉搏进行测量得到相关的人体健康参数。

Due to its good body surface conformal characteristics, flexible strain sensor has attracted much attention in wearable medical electronics. In this paper, polymer-coated carbon nanotubes were prepared by amination of styrene-maleic anhydride (SMA) with aminated multiwalled carbon nanotubes (amino-MWCNTs). As the base material, elastic cotton thread was impregnated into the mixture of low mass fraction and high mass fraction of aminated carbon nanotubes/UV glue and cured by UV light, and the ultra-sensitive flexible strain sensor with crack structure was prepared by pre-stretching after curing. The results show that the sensor has a wide detection range (0-40% strain), high sensitivity $ G_{f} $ (0-13% strain, $ G_{f}=4\ 000 $), a low detection limit (0.2% strain) and good repeatability (1 000 loading/unloading cycles) through the design of double strain layer combined with crack structure. The sensor can measure the pulse of the human body and get relevant human health parameters.