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Highly Adhesive and Stretchable Epidermal Electrode for Bimodal Recording Patch.

Shuaijian Yang1, Chenqi Liu1, Lixue Tang1,2

  • 1Shenzhen Key Laboratory of Smart Healthcare Engineering, Guangdong Provincial Key Laboratory of Advanced Biomaterials, Department of Biomedical Engineering, Southern University of Science and Technology, No. 1088 Xueyuan Rd, Nanshan District, Shenzhen, Guangdong 518055, China.

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Summary

We developed a novel, adhesive, and stretchable dry electrode for stable electrophysiological recordings. This conductive polymer and tea polyphenol (CPT) electrode ensures high-quality electromyography (EMG) signals for over 72 hours, even during movement.

Keywords:
EMGadhesive electrodeconductive polymerrehabilitationstretchable electronics

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Area of Science:

  • Biomedical Engineering
  • Materials Science
  • Neuroscience

Background:

  • Stable electrophysiological interfaces are crucial for biological and human-machine applications.
  • Existing epidermal electrodes often struggle to balance conductivity, stretchability, and adhesiveness.
  • A need exists for advanced materials that meet these requirements for reliable signal acquisition.

Purpose of the Study:

  • To develop a novel dry electromyography (EMG) electrode with enhanced adhesiveness and stretchability.
  • To evaluate the performance of the new electrode for long-term, stable electrophysiological signal recording.
  • To integrate the electrode into a wearable patch for rehabilitation monitoring.

Main Methods:

  • Fabrication of a dry electrode using conductive polymers and tea polyphenol (CPT).
  • Characterization of electrode properties including adhesiveness, stretchability, and impedance.
  • Assessment of EMG signal recording stability and signal-to-noise ratio over time and under vibration.
  • Integration of CPT electrodes with a liquid metal strain sensor on a Kinesio Tape substrate to create a bimodal rehabilitation monitoring patch (BRMP).

Main Results:

  • The CPT electrode demonstrated excellent adhesiveness (0.51 N/cm) and stretchability (157%).
  • Achieved low impedance (14 kΩ cm² at 100 Hz) and high signal-to-noise ratio (>25 dB) for stable EMG recording over 72 hours.
  • The developed BRMP effectively recorded signals even with knee braces, offering a comfortable fit and aiding rehabilitation monitoring.

Conclusions:

  • The CPT-based dry electrode offers a promising solution for stable electrophysiological recording.
  • The bimodal rehabilitation monitoring patch (BRMP) provides a comfortable and effective tool for sports injury rehabilitation.
  • This technology holds potential for advancing biological and human-machine interface applications.