High sensitivity graphene based health sensor with self-warning function

Lu-Qi Tao; Chenwei Gao; Guanya Wang; Hao Sun; Liang-Yan Guo; Tian-Ling Ren

doi:10.1016/j.compscitech.2023.110123

High sensitivity graphene based health sensor with self-warning function

Compos Sci Technol. 2023 Jun 28:110123. doi: 10.1016/j.compscitech.2023.110123. Online ahead of print.

Authors

Lu-Qi Tao¹, Chenwei Gao², Guanya Wang², Hao Sun², Liang-Yan Guo², Tian-Ling Ren³

Affiliations

¹ Beijing Engineering Research Center of Industrial Spectrum Imaging, School of Automation and Electrical Engineering, University of Science and Technology Beijing, Beijing, 100083, China.
² National Key Laboratory of Power Transmission Equipment Technology, School of Electrical Engineering, Chongqing University, Chongqing, 400044, China.
³ Institute of Microelectronics and Beijing National Research Center for Information Science and Technology (BNRist), Tsinghua University, Beijing, 100084, China.

Abstract

In order to reduce the damage to people's health from diseases that attack the respiratory system such as COVID-19, asthma, and pneumonia, it is desired that patients' breathing can be monitored and alerted in real-time. The emergence of wearable health detection sensing devices has provided a relatively good response to this problem. However, there are still problems such as complex structure and poor performance. This paper introduces a laser-induced graphene (LIG) device that is attached to PDMS. The LIG is produced by laser irradiation of Nomex and subsequently transferred and attached to the PDMS. After being tested, it has demonstrated high sensitivity, stable tensile performance, good acoustic performance, excellent thermal stability, and other favorable properties. Notably, its gauge factor (GF) value can reach 721.67, which is quite impressive. Additionally, it is capable of emitting an alarm sound with an SPL close to 60 dB when receiving signals within the range of 5-20 kHz. The device realizes mechanical sensing and acoustic functions in one chip, and has a high application value in applications that need to combine sensing and early warning.

Keywords: Flexible electronics; Health monitoring; Laser-induced graphene; Tensile strain sensor; Wearable devices.