4.8 Article

Design of a Superhydrophobic Strain Sensor with a Multilayer Structure for Human Motion Monitoring

Journal

ACS APPLIED MATERIALS & INTERFACES
Volume 14, Issue 1, Pages 1874-1884

Publisher

AMER CHEMICAL SOC
DOI: 10.1021/acsami.1c17565

Keywords

strain sensor; polyurethane; superhydrophobicity; large working range; high sensitivity

Funding

  1. Guangxi Natural Science Foundation Program [2019GXNSFBA185006, 2020GXNSFBA159023]
  2. Foundation of Guangxi Key Laboratory of Clean Pulp & Papermaking and Pollution Control, College of Light Industry and Food Engineering, Guangxi University [2019ZR03]
  3. Open Funding Project of the State Key Laboratory of Biocatalysis and Enzyme Engineering [SKLBEE2020009]

Ask authors/readers for more resources

The newly designed PU/rGO/PDA/PFDT strain sensor possesses advantages such as superhydrophobicity, wide working strain range, and high gauge factor, and can effectively detect human movement signals even in high humidity environments.
A flexible strain sensor is of significant importance in wearable electronics since it can help monitor the physical signals from the human body. Among various strain sensors, the polyurethane (PU)-based ones have received widespread attention owing to their excellent toughness, large working range, and nice gas permeability. However, the hydrophobicity of these sensors is not good enough, which may affect their use life and sensitivity. In this work, a high-performance strain sensor composed of PU, reduced graphene oxide (rGO), polydopamine PDA), and 1H,1H,2H,2H-perfluorodecane-thiol (PFDT) was designed and prepared. The results revealed that this PU/rGO/PDA/PFDT device possessed good superhydrophobicity with a water contact angle of 153.3 degrees, a wide working strain range of 590%, and an outstanding gauge factor as high as 221 simultaneously. Because of these above advantages, the sensor worked effectively in detecting both subtle and large human movements (such as joint motion, finger motion, and vocal cord vibration) even in a high humidity environment. This strain sensor with high sensitivity, wide working range, and suitable modulus may have great potential in the field of flexible and wearable electronics in the near future.

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