Wearable light curing type highly sensitive flexible strain sensor

Journal Information

J. Hefei Univ. Tech. (Nat. Sci.), Oct.2023, Vol.46 No.10: 1374-1379, 1414

DOI: 10.3969/j.issn.1003-5060.2023.10.012

Authors

SHEN Liang $ ^{1} $, LIU Ping $ ^{1} $, TONG Wei $ ^{1} $, WU Shunge $ ^{1} $, LIU Caixia $ ^{1,2} $, HUANG Ying $ ^{1} $

(1. School of Microelectronics, Hefei University of Technology, Hefei 230601, China; 2. School of Physics, Hefei University of Technology, Hefei 230601, China)

Abstract and Keywords

Abstract: 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.

Keywords: double-layer cooperative conductive network; light curing; crack; high sensitivity; resistance type

作者信息

沈亮 $ ^{1} $，刘平 $ ^{1} $，童伟 $ ^{1} $，吴顺哥 $ ^{1} $，刘彩霞 $ ^{1,2} $，黄英 $ ^{1} $

(1. 合肥工业大学微电子学院, 安徽合肥 230601; 2. 合肥工业大学物理学院, 安徽合肥 230601)

摘要和关键词

摘要: 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。

关键词: 双层协同导电网络；光固化；裂纹；高灵敏度；电阻式

Funding

浙江省“尖兵”“领雁”研发攻关计划资助项目（2022C03052）；中央高校基本科研业务费专项资金资助项目（JZ2020HGTB0027）

合肥工业大学学报(自然科学版)

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