期刊
SENSORS AND ACTUATORS B-CHEMICAL
卷 277, 期 -, 页码 250-260出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2018.08.155
关键词
Electrochemical impedance spectroscopy; Dry electrode; Semi-dry electrode; Wet electrode; Equivalent circuit; Electrode-Skin impedance
资金
- Natural Science Foundation of China [61703152]
- National Key Technology RD Program [2012BAI16B02]
- National High Tech Research and Development Program of China (863 Program) [2015AA020514]
- Hunan Provincial Natural Science Foundation [2018JJ3134]
- Zhuzhou Science and Technology Plans [201707201806]
The electrode-scalp impedance of six subjects is studied by electrochemical impedance spectroscopy using three representative electrodes, namely wet electrodes, semi-dry electrodes, and dry electrodes. With the analysis of proposed equivalent models and area-normalized impedance (kQ cm(2)), the specific electrode double layer resistances are 530 Q cm(2) for all electrodes, their specific contact resistances R are 80 Q cm(2), 114 Q cm(2) and 20,077 Q cm(2), and their specific skin resistances 13., are 867 Q cm(2), 1730 Q cm(2) and 46,145 Q cm(2) for these three representative electrodes respectively. When pressure was applied on dry electrodes, R reduced by 47% and Rs reduced by 81%. When pressure was applied on semi-dry electrodes, Rs reduced by 50% (R is not applicable for semi-dry electrodes). After application of scalp abrasion for dry electrodes, R reduced by 36% and Rs reduced by 82%. After application of scalp abrasion for semi-dry electrodes, Rs reduced by 64%. Seeking novel interface materials may break through the bottleneck for dry electrodes development in terms of integrated materials, mechanical support and electronic circuitry, while semi-dry electrodes have much development space to meet a balance of quick setup, comfortable wear, and satisfactory signal quality in many medical and out-clinic applications.
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