Article
Engineering, Biomedical
Guangli Li, Sizhe Wang, Mingzhe Li, Yanwen Y. Duan
Summary: A novel semi-dry electrode was constructed for capturing EEG signals on hairy scalps, showing automatic electrolyte concepts. The electrode exhibited low impedance, high correlation with wet electrodes, and similar frequency spectra, indicating promising potential in real-life EEG applications.
JOURNAL OF NEURAL ENGINEERING
(2021)
Article
Neurosciences
Patrique Fiedler, Carlos Fonseca, Eko Supriyanto, Frank Zanow, Jens Haueisen
Summary: The new dry 256-channel HD-EEG electrode cap overcomes the principal limitations of HD-EEG in terms of preparation complexity, allowing rapid application by non-medically trained individuals, and enabling new use cases for HD-EEG. The dry electrodes make recording with state-of-the-art EEG amplifiers easier, while also demonstrating superior performance and wearing comfort.
HUMAN BRAIN MAPPING
(2022)
Article
Engineering, Multidisciplinary
Hui-Ling Peng, Yue-ling Sun, Cheng Bi, Quan-Fu Li
Summary: A flexible dry electrode based on MXene ink and flexible polyimide substrate was developed, which can accurately record biopotential signals such as ECG, EEG, and EOG, and has good flexibility and adaptability.
Article
Engineering, Biomedical
Guangli Li, Ying Liu, Yuwei Chen, Mingzhe Li, Jian Song, Kanghua Li, Youmei Zhang, Le Hu, Xiaoman Qi, Xuan Wan, Jun Liu, Quanguo He, Haihan Zhou
Summary: Objective. This study develops a flexible, durable, and low-contact-impedance polyvinyl alcohol/polyacrylamide double-network hydrogel (PVA/PAM DNH)-based semi-dry electrode for robust EEG recording at hairy scalp. Approach. The PVA/PAM DNHs are developed using a cyclic freeze-thaw strategy and used as a saline reservoir for semi-dry electrodes. Main results. The proposed semi-dry electrode exhibits a low contact impedance, a small offset potential, and negligible potential drift. Furthermore, no significant differences are present in BCI classification accuracy between the semi-dry and wet electrodes. Significance. Based on the durability, rapid setup, wear-comfort, and robust signals of the developed hydrogel, PVA/PAM DNH-based semi-dry electrodes are a promising alternative to wet electrodes in real-life BCIs.
JOURNAL OF NEURAL ENGINEERING
(2023)
Review
Materials Science, Multidisciplinary
Liangtao Yang, Qing Liu, Zhilin Zhang, Lu Gan, Yi Zhang, Jinglong Wu
Summary: Electroencephalography (EEG) is widely used in brain cognition, clinical diagnosis, and artificial intelligence, but the traditional Ag/AgCl electrode requires complex pre-preparation. Therefore, the development of dry electrodes is urgently needed to simplify the testing process and improve subject comfort.
ADVANCED MATERIALS TECHNOLOGIES
(2022)
Article
Nanoscience & Nanotechnology
Junshi Li, Yundong Ma, Dong Huang, Zhongyan Wang, Zhitong Zhang, Yingjie Ren, Mengyue Hong, Yufeng Chen, Tingyu Li, Xiaoyi Shi, Lu Cao, Jiayan Zhang, Bingli Jiao, Junhua Liu, Hongqiang Sun, Zhihong Li
Summary: The researchers have developed a flexible MNA electrode that can fit a curved body surface, penetrate the skin without fracture, and be mass-produced with a simplified process. The electrode is compatible with wearable wireless systems and has a short preparation time, improving the comfort and convenience of electrophysiological recording.
NANO-MICRO LETTERS
(2022)
Article
Chemistry, Analytical
Ramona B. Damalerio, Ruiqi Lim, Yuan Gao, Tan-Tan Zhang, Ming-Yuan Cheng
Summary: Dry EEG electrodes with low impedance were fabricated using polyimide flexible printed circuit board and polydimethylsiloxane. Two types of dry electrodes, flat-disk electrodes for limited hair and multilegged electrodes for thick hair, were tested with impedance values ranging from 65 to 120 kO. The brain wave patterns acquired with these electrodes were comparable to conventional wet electrodes. Skin irritation and cytotoxicity tests showed that the fabricated EEG electrodes passed the standards.
Article
Engineering, Multidisciplinary
ZhongYan Shi, Bo Jiang, ShiChao Liang, JiangTao Zhang, DingJie Suo, JingLong Wu, DuanDuan Chen, GuangYing Pei, TianYi Yan
Summary: This study aims to develop and evaluate a novel dry electrode for EEG recordings. The dry electrode is based on the design of the sea anemone, which improves scalp fit and reduces signal noise and motion artifacts. The electrode materials include advanced conducting polymers combined with thermoplastic elastomers and carbon nanotubes, which exhibit good electrical conductivity, mechanical properties, and safety. Low-cost injection molding fabrication method is proposed. Resting-state EEG and event-related potential signals collected by the anemone dry electrode achieved more than 90% similarity with wet electrodes. Therefore, this low-cost and comfortable anemone dry electrode represents an important technological advance in material and structural design for EEG recording sensors.
SCIENCE CHINA-TECHNOLOGICAL SCIENCES
(2023)
Article
Engineering, Electrical & Electronic
Abolfazl Harati, Amir Jahanshahi
Summary: A relatively inexpensive, flexible, and stretchable dry electrode for EEG recording is presented in this study. The electrode demonstrates good mechanical and electrical reliability, with electrical performance similar to standard wet Ag/AgCl electrodes. The mechanical endurance of the electrode is verified through custom-designed stroke tests under relatively severe conditions.
SENSORS AND ACTUATORS A-PHYSICAL
(2021)
Article
Chemistry, Multidisciplinary
Rainer Schmidt, Felix Carrascoso Plana, Norbert Marcel Nemes, Federico Mompean, Mar Garcia-Hernandez
Summary: This work demonstrates the use of electrical impedance spectroscopy (EIS) to analyze the dielectric contributions in encapsulated single graphene layers. The dielectric data qualitatively vary with the resistance of the graphene layers. For low graphene resistance, the dielectric spectra are dominated by inductive contributions, which can be separated from the intrinsic graphene resistance using an appropriate equivalent circuit model. However, for high graphene resistance, the analysis is not feasible due to the limitations of the EIS technique at high frequencies.
Article
Chemistry, Analytical
Yiping Huang, Yatong Song, Li Gou, Yuanwen Zou
Summary: Wearable flexible silver electrodes based on cowhide were prepared and tested for their waveform transmission and impedance. The results showed that these electrodes were comparable to standard gel electrodes when the skin is moist enough, and had higher signal-to-noise ratios than the standard electrodes in the standing posture.
Article
Engineering, Biomedical
Li-Wei Ko, Cheng-Hua Su, Pei-Lun Liao, Jui-Ting Liang, Yao-Hsuan Tseng, Shih-Hsun Chen
Summary: The study developed an affordable dry electrode using silicone gel, metal flakes, and graphene/GO based on previous design. The electrodes showed low impedance and good signal correlation to wet electrodes, with graphene/GO electrodes demonstrating good signal quality in eyes-open EEG recording. However, excessive graphene/GO led to uneven surfaces and decreased performance, suggesting careful optimization is needed.
JOURNAL OF NEURAL ENGINEERING
(2021)
Article
Engineering, Electrical & Electronic
Riccardo Raho, Elisa Scarpa, Antonio Nunzio D'Angelo, Denis Desmaele, Federica Raheli, Antonio Qualtieri, Francesco Rizzi, Massimo De Vittorio
Summary: This paper reports on the fabrication and characterization of a novel reusable Flexible Dry Electrode (FDE) for medical applications. The FDEs were made using two flexible substrates and conductive layers, and their performance was tested and compared to commercial gel electrodes. The results showed that the FDEs had comparable performance in bioelectrical impedance analysis (BIA) measurements and demonstrated promising long-term reliability for wearable and portable devices.
SENSORS AND ACTUATORS A-PHYSICAL
(2022)
Article
Engineering, Electrical & Electronic
Granch Berhe Tseghai, Benny Malengier, Kinde Anlay Fante, Lieva Van Langenhove
Summary: The research has developed a washable and flexible textile-based dry EEG electrode that can detect brain activities. The electrode offers clear and reliable EEG signals even after multiple washing and bending cycles, opening up possibilities for long-term EEG monitoring.
IEEE SENSORS JOURNAL
(2021)
Article
Chemistry, Multidisciplinary
Ya Liu, Minyue Li, Bo Lei, Minghong Wu, Jing Zhan
Summary: This paper investigates a low-cost and straightforward method to synthesize small-particle iron-based graphene composites at room temperature. The obtained amorphous Fe2O3 nanoparticle@dry graphene oxide composites show excellent lithium ion diffusion conditions and cycling stability.
NEW JOURNAL OF CHEMISTRY
(2022)
