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CNT–PDMS film-based flexion sensor for examining physical activity in humans

  • Carbon Letters
  • Abbr : Carbon Lett.
  • 2024, 34(4), pp.1187-1195
  • DOI : 10.1007/s42823-023-00678-x
  • Publisher : Korean Carbon Society
  • Research Area : Natural Science > Natural Science General > Other Natural Sciences General
  • Received : September 21, 2023
  • Accepted : December 19, 2023
  • Published : June 14, 2024

Elizabeth Indu 1 Athira C. 1 Paul Sharon J. 2 Singh Bhanu P. 2

1Surface Engineering Division, CSIR-National Aerospace Laboratories
2CSIR-National Physical Laboratory

Accredited

ABSTRACT

Sensors for monitoring human body movements have gained much attention in the recent times especially in the health-care sector as these devices offer real-time monitoring of vital physiological signs, enabling health-care professionals to evaluate health conditions and provide remote feedback. In this work, we have fabricated carbon-nanotube (CNT)/ polydimethylsiloxane (PDMS) composite sensor through simple dispersion and freezing method for monitoring flexion movements in humans. Sensors with different CNT loadings, namely 0.1 wt %, 0.5 wt %, and 1 wt % were fabricated and analyzed to find the best performing sensor. Several characterizations like Raman, X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), thermogravimetric analysis (TGA), tensile strength measurements, and piezoresistive studies were carried out to study the features of the sensors. Among the fabricated sensors, the one with the loading concentration of 0.5 wt% is found to be most sensitive for flexion applications with higher gauge factor of 533 at 60% strain level, response time of ~ 140 ms and lower hysteresis loss. The feasibility of the sensor for monitoring flexion like finger bending, wrist bending, elbow bending, and knee bending is also analyzed making it ideal for use in sports for athletes, physicians, and trainers to investigate physical performance and well-being.

Citation status

* References for papers published after 2023 are currently being built.