Stretchable multi-mode sensor with single and simultaneous sensing modes for human neck motion tracking

• Published in: Applied materials today 2023-08, Vol.33, p.101874, Article 101874
• Main Authors: Jo, Hyeongjin, Bae, Yonghyeon, Song, Yujun, Han, Jeongmok, Song, Ji-Hyeon
• Format: Article
• Language: English
• Subjects: Motion tracking; Piezoelectric; Piezoresistive; Strain sensor; Stretchable sensor; Wearable sensor; Yarn structure
• ISSN: 2352-9407; 2352-9415
• DOI: 10.1016/j.apmt.2023.101874

•The multi-mode sensor which differentiates three different forces and decouples simultaneous forces is introduced in this work.•This sensor is constructed in yarn structure with piezoelectric and piezoresistive sensors.•With expanded functional structures of sensors, individual models exhibit responses with adjusted sensitivity.•As an application, the sensor is applied to the human neck to track the motion. Sensors with stretchability and multimodality are increasingly desired. This paper proposes a multimode sensor with three modes to detect and differentiate clockwise and counterclockwise twisting motions as well as stretching. This sensor consists of piezoelectric and piezoresistive sensors with a yarn-type functional structure and has a stretchable substrate that affords stretchability (∼80%). We use electrohydrodynamic spray to deposit conductive materials, which results in a stable and stretchable conductive network on substrates. The sensor can distinguish forces exerted on it through its different voltage and resistance change responses to external stimuli. We use a mathematical model to expand its ability to a simultaneous sensing mode. As an application, we construct a human neck tracking system with the multimode sensor. [Display omitted]