Robust, self‐adhesive, and low‐contact impedance polyvinyl alcohol/polyacrylamide dual‐network hydrogel semidry electrode for biopotential signal acquisition
Guangli Li,
Ying Liu,
Yuwei Chen,
Yonghui Xia,
Xiaoman Qi,
Xuan Wan,
Yuan Jin,
Jun Liu,
Quanguo He,
Kanghua Li,
Jianxin Tang
Affiliations
Guangli Li
Hunan Key Laboratory of Biomedical Nanomaterials and Devices, College of Life Sciences and Chemistry Hunan University of Technology Zhuzhou China
Ying Liu
Hunan Key Laboratory of Biomedical Nanomaterials and Devices, College of Life Sciences and Chemistry Hunan University of Technology Zhuzhou China
Yuwei Chen
Hunan Key Laboratory of Biomedical Nanomaterials and Devices, College of Life Sciences and Chemistry Hunan University of Technology Zhuzhou China
Yonghui Xia
Zhuzhou Institute for Food and Drug Control Zhuzhou China
Xiaoman Qi
Hunan Key Laboratory of Biomedical Nanomaterials and Devices, College of Life Sciences and Chemistry Hunan University of Technology Zhuzhou China
Xuan Wan
Hunan Key Laboratory of Biomedical Nanomaterials and Devices, College of Life Sciences and Chemistry Hunan University of Technology Zhuzhou China
Yuan Jin
Hunan Key Laboratory of Biomedical Nanomaterials and Devices, College of Life Sciences and Chemistry Hunan University of Technology Zhuzhou China
Jun Liu
Hunan Key Laboratory of Biomedical Nanomaterials and Devices, College of Life Sciences and Chemistry Hunan University of Technology Zhuzhou China
Quanguo He
Hunan Key Laboratory of Biomedical Nanomaterials and Devices, College of Life Sciences and Chemistry Hunan University of Technology Zhuzhou China
Kanghua Li
Department of Neurology Zhuzhou People's Hospital Zhuzhou China
Jianxin Tang
Hunan Key Laboratory of Biomedical Nanomaterials and Devices, College of Life Sciences and Chemistry Hunan University of Technology Zhuzhou China
Abstract Herein, we fabricated a flexible semidry electrode with excellent mechanical performance, satisfactory self‐adhesiveness, and low‐contact impedance using physical/chemical crosslinked polyvinyl alcohol/polyacrylamide dual‐network hydrogels (PVA/PAM DNHs) as an efficient saline reservoir. The resultant PVA/PAM DNHs showed admirable adhesive and compliance to the hairy scalp, facilitating the establishment of a robust electrode/skin interface for biopotential signal transmission. Moreover, the PVA/PAM DNHs steadily released trace saline onto the scalp to achieve the minimized potential drift (1.47 ± 0.39 mV/min) and low electrode–scalp impedance (18.2 ± 8.9 kΩ @ 10 Hz). More importantly, the application feasibility of real‐world brain−computer interfaces (BCIs) was preliminarily validated by 10 participants using two classic BCI paradigms. The mean temporal cross‐correlation coefficients between the semidry and wet electrodes in the eyes open/closed and the N200 speller paradigms are 0.919 ± 0.054 and 0.912 ± 0.050, respectively. Both electrodes demonstrate anticipated neuroelectrophysiological responses with similar patterns. This semidry electrode could also effectively capture robust P‐QRS‐T peaks during electrocardiogram recording. Considering their outstanding advantages of fast setup, user‐friendliness, and robust signals, the proposed PVA/PAM DNH‐based electrode is a promising alternative to wet electrodes in biopotential signal acquisition.
