期刊
MICROMACHINES
卷 11, 期 3, 页码 -出版社
MDPI
DOI: 10.3390/mi11030239
关键词
elastic sEMG electrode; strain-insensitivity; electrode-skin impedance; skin-conformability; signal-to-noise ratio
类别
资金
- China International Cooperation Project [2016YFE0126700]
- National Natural Foundation of China [61774161, 51971233, 51931011, 61704177, 51525103]
- CAS (Chinese Academy of Sciences) President's International Fellowship Initiative (PIFI) [2019PE0019]
- PublicWelfare Technical Applied Research Project of Zhejiang Province [2017C31100, LGG19F010006]
- Ningbo Major Special Projects of the Plan Science and Technology Innovation 2025 [2018B10057]
- Ningbo Science and Technology Innovation Team [2015B11001, 2019B101027]
- International Cooperation Project of Chinese Academy of Sciences [174433KYSB20190038]
Surface electromyography (sEMG) sensors are widely used in the fields of ergonomics, sports science, and medical research. However, current sEMG sensors cannot recognize the various exercise intensities efficiently because of the strain interference, low conductivity, and poor skin-conformability of their electrodes. Here, we present a highly conductive, strain-insensitive, and low electrode-skin impedance elastic sEMG electrode, which consists of a three-layered structure (polydimethylsiloxane/galinstan + polydimethylsiloxane/silver-coated nickel + polydimethylsiloxane). The bottom layer of the electrode consists of vertically conductive magnetic particle paths, which are insensitive to stretching strain, collect sEMG charge from human skin, and finally transfer it to processing circuits via an intermediate layer. Our skin-friendly electrode exhibits high conductivity (0.237 and 1.635 m omega center dot cm resistivities in transverse and longitudinal directions, respectively), low electrode-skin impedance (47.23 k omega at 150 Hz), excellent strain-insensitivity (10% change of electrode-skin impedance within the 0-25% strain range), high fatigue resistance (>1500 cycles), and good conformability with skin. During various exercise intensities, the signal-to-noise ratio (SNR) of our electrode increased by 22.53 dB, which is 206% and 330% more than that of traditional Ag/AgCl and copper electrode, respectively. The ability of our electrode to efficiently recognize various exercise intensities confirms its great application potential for the field of sports health.
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