MXene‐Sponge Based High‐Performance Piezoresistive Sensor for Wearable Biomonitoring and Real‐Time Tactile Sensing. Issue 2 (25th November 2021)

• Record Type: Journal Article
• Authors: Wei, Qikun; Chen, Guorui; Pan, Hong; Ye, Zongbiao; Au, Christian; Chen, Chunxu; Zhao, Xun; Zhou, Yihao; Xiao, Xiao; Tai, Huiling; Jiang, Yadong; Xie, Guangzhong; Su, Yuanjie; Chen, Jun
• Is Part Of: Small methods. Volume 6:Issue 2(2022)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2021-11-25
• Subjects: electrodes -- helium plasma processing -- MXenes -- piezoresistive sensors -- wearable bioelectronics; Nanotechnology -- Methodology -- Periodicals; Nanotechnology -- Periodicals; Periodicals; 620.5028
• DOI: 10.1002/smtd.202101051
• Languages: English
• ISSNs: 2366-9608

Abstract

Abstract: Electrode microfabrication technologies such as lithography and deposition have been widely applied in wearable electronics to boost interfacial coupling efficiency and device performance. However, a majority of these approaches are restricted by expensive and complicated processing techniques, as well as waste discharge. Here, helium plasma irradiation is employed to yield a molybdenum microstructured electrode, which is constructed into a flexible piezoresistive pressure sensor based on a Ti3 C2 Tx nanosheet‐immersed polyurethane sponge. This electrode engineering strategy enables the smooth transition between sponge deformation and MXene interlamellar displacement, giving rise to high sensitivity (1.52 kPa −1 ) and good linearity ( r 2 = 0.9985) in a wide sensing range (0–100 kPa) with a response time of 226 ms for pressure detection. In addition, both the experimental characterization and finite element simulation confirm that the hierarchical structures modulated by pore size, plasma bias, and MXene concentration play a crucial role in improving the sensing performance. Furthermore, the as‐developed flexible pressure sensor is demonstrated to measure human radial pulse, detect finger tapping, foot stomping, and perform object identification, revealing great feasibility in wearable biomonitoring and health assessment. Abstract : In this work, helium plasma irradiation is employed to engineer microstructured molybdenum electrode for a flexible piezoresistive pressure sensor based on a Ti3 C2 T x nanosheet immersed polyurethane sponge. The sensor realizes the smooth transition between sponge deformation and MXene interlamellar displacement, leading to high sensitivity and good linearity in a wide pressure detection range from 0 to 100 kPa.