Wearable, Ultrawide-Range, and Bending-Insensitive Pressure Sensor Based on Carbon Nanotube Network-Coated Porous Elastomer Sponges for Human Interface and Healthcare Devices

Seunghwan Kim, Morteza Amjadi, Tae-Ik Lee, Yongrok Jeong, Donguk Kwon, Min Seong Kim, Kyuyoung Kim, Taek-Soo Kim, Yong Suk Oh, Inkyu Park

Research output: Contribution to journalArticle

1 Downloads (Pure)

Abstract

Flexible and wearable pressure sensors have attracted a tremendous amount of attention due to their wider applications in human interfaces and healthcare monitoring. However, achieving accurate pressure detection and stability against external stimuli (in particular, bending deformation) over a wide range of pressures from tactile to body weight levels is a great challenge. Here, we introduce an ultrawide-range, bending-insensitive, and flexible pressure sensor based on a carbon nanotube (CNT) network-coated thin porous elastomer sponge for use in human interface devices. The integration of the CNT networks into three-dimensional microporous elastomers provides high deformability and a large change in contact between the conductive CNT networks due to the presence of micropores, thereby improving the sensitivity compared with that obtained using CNT-embedded solid elastomers. As electrical pathways are continuously generated up to high compressive strain (∼80%), the pressure sensor shows an ultrawide pressure sensing range (10 Pa to 1.2 MPa) while maintaining favorable sensitivity (0.01–0.02 kPa–1) and linearity (R2 ∼ 0.98). Also, the pressure sensor exhibits excellent electromechanical stability and insensitivity to bending-induced deformations. Finally, we demonstrate that the pressure sensor can be applied in a flexible piano pad as an entertainment human interface device and a flexible foot insole as a wearable healthcare and gait monitoring device.
Original languageEnglish
Pages (from-to)23639-23648
Number of pages10
JournalACS Applied Materials and Interfaces
Volume11
Issue number26
Early online date10 Jun 2019
DOIs
Publication statusPublished - 3 Jul 2019

Keywords

  • bending insensitivity
  • carbon nanotube
  • flexible pressure sensor
  • human interface device
  • microporous elastomer
  • ultrawide pressure range

ASJC Scopus subject areas

  • Materials Science(all)

Cite this