Fabrication of chitosan/Au-TiO2 nanotube-based dry electrodes for electroencephalography recording

Song, Yang; Li, Penghai; Li, Mingji; Li, Hongji; Li, Cuiping; Sun, Dong; Bin, Yang

doi:10.1016/j.msec.2017.05.114

Cited by 24 publications

(6 citation statements)

References 38 publications

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“…To develop a practical dry electrode, the contact resistance between the dry electrode and the scalp must be addressed to construct an effective ion/electron conversion interface. In 2017, Song [ 33 ] put forward a multi-level EEG electrode with a three-layer electrode structure containing Ti plate, TiO 2 nanotube, and a chitosan layer. The prepared Ch/Au-TiO 2 dry electrode has an efficient and stable current conversion interface, a highly biocompatible contact surface and a fast electron transfer channel.…”

Section: Surface Dry Electrodesmentioning

confidence: 99%

“…The impedance remains about 18 kΩ at 10 Hz. DRIE, wet etching, evaporation, thermal oxidation Song [ 33 ] Chitosan/Au-TiO2 nanotube-based dry electrodes for EEG Chitosan (Ch), Au, TiO 2 nanotube, Ti Surface EEG electrode This dry electrode is a Ch/Au-TiO 2 /Au-Ti multilayer film, the mean impedance values were approximately 169 ± 33.0kΩ at 2.15Hz and 67.4 ± 8.9 kΩ at 100 Hz. Electrochemistry-based multi-potential step technology, electrochemical anodic oxidation method Fiedler [ 34 ] Novel multipin electrode cap system Polyurethane, Ag/AgCl Surface EEG electrode The electrode consists of 24 single pins with circular tops of 1 mm in diameter and a height of 6 mm, the distances of the pins are 2.5 mm.…”

Section: Table A1mentioning

confidence: 99%

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Dry Electrodes for Human Bioelectrical Signal Monitoring

Zhao

Dong

et al. 2020

Sensors

138

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Bioelectrical or electrophysiological signals generated by living cells or tissues during daily physiological activities are closely related to the state of the body and organ functions, and therefore are widely used in clinical diagnosis, health monitoring, intelligent control and human-computer interaction. Ag/AgCl electrodes with wet conductive gels are widely used to pick up these bioelectrical signals using electrodes and record them in the form of electroencephalograms, electrocardiograms, electromyography, electrooculograms, etc. However, the inconvenience, instability and infection problems resulting from the use of gel with Ag/AgCl wet electrodes can’t meet the needs of long-term signal acquisition, especially in wearable applications. Hence, focus has shifted toward the study of dry electrodes that can work without gels or adhesives. In this paper, a retrospective overview of the development of dry electrodes used for monitoring bioelectrical signals is provided, including the sensing principles, material selection, device preparation, and measurement performance. In addition, the challenges regarding the limitations of materials, fabrication technologies and wearable performance of dry electrodes are discussed. Finally, the development obstacles and application advantages of different dry electrodes are analyzed to make a comparison and reveal research directions for future studies.

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Section: Surface Dry Electrodesmentioning

confidence: 99%

Section: Table A1mentioning

confidence: 99%

Dry Electrodes for Human Bioelectrical Signal Monitoring

Zhao

Dong

et al. 2020

Sensors

138

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“…Recently, much effort has been devoted to developing noninvasive dry electrodes for the emerging applications [27][28][29]. Liu et al proposed novel spring probebased dry EEG electrodes, which can yield buffering effects to ensure the dry electrodes contact the scalp effectively [28].…”

Section: Introductionmentioning

confidence: 99%

Towards emerging EEG applications: a novel printable flexible Ag/AgCl dry electrode array for robust recording of EEG signals at forehead sites

Xia

et al. 2020

J. Neural Eng.

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Objectives. With the rapid development of EEG-based wearable healthcare devices and brain–computer interfaces, reliable and user-friendly EEG sensors for EEG recording, especially at forehead sites, are highly desirable and challenging. However, existing EEG sensors cannot meet the requirements, since wet electrodes require tedious setup and conductive pastes or gels, and most dry electrodes show unacceptable high contact impedance. In addition, the existing electrodes cannot absorb sweat effectively; sweat would cause cross-interferences, and even short circuits, between adjacent electrodes, especially in the moving scenarios, or a hot and humid environment. To resolve these problems, a novel printable flexible Ag/AgCl dry electrode array was developed for EEG acquisition at forehead sites, mainly consisting of screen printing the Ag/AgCl coating, conductive sweat-absorbable sponges and flexible tines. Approach. A systematic method was also established to evaluate the flexible dry electrode array. Main results. The experimental results show the flexible dry electrode array has reproducible electrode potential, relatively low electrode–skin impedance, and good stability. Moreover, the EEG signals can be effectively captured with a high quality that is comparable to that of wet electrodes. Significance. All the results confirmed the feasibility of forehead EEG recording in real-world scenarios using the proposed flexible dry electrode array, with a rapid and facile operation as well as the advantages of self-application, user-friendliness and wearer comfort.

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“…Spiky microneedles, which have lengths of 100–210 μm [7], around 150 μm [8], and 300 μm [9], are typically fabricated on a silicon wafer using special etching processes. In addition to silicon-based materials, a brush-type carbon nanotube-based [10], chitosan/Au-TiO 2 nanotube-based [11], and polydimethylsiloxane (PDMS) substrate-based MEMS electrodes [12] have been developed for various kinds of electrophysiological sensing. Although the tip of microneedles can pass directly through into the inner skin layer to create a direct DC-coupled interface with the scalp surface, their complicated and costly fabrication process and infection risks still remain as practical constraints.…”

Section: Introductionmentioning

confidence: 99%

Two-Wired Active Spring-Loaded Dry Electrodes for EEG Measurements

Lee

Shin²,

Kumar

et al. 2019

Sensors

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Dry contact electrode-based EEG acquisition is one of the easiest ways to obtain neural information from the human brain, providing many advantages such as rapid installation, and enhanced wearability. However, high contact impedance due to insufficient electrical coupling at the electrode-scalp interface still remains a critical issue. In this paper, a two-wired active dry electrode system is proposed by combining finger-shaped spring-loaded probes and active buffer circuits. The shrinkable probes and bootstrap topology-based buffer circuitry provide reliable electrical coupling with an uneven and hairy scalp and effective input impedance conversion along with low input capacitance. Through analysis of the equivalent circuit model, the proposed electrode was carefully designed by employing off-the-shelf discrete components and a low-noise zero-drift amplifier. Several electrical evaluations such as noise spectral density measurements and input capacitance estimation were performed together with simple experiments for alpha rhythm detection. The experimental results showed that the proposed electrode is capable of clear detection for the alpha rhythm activation, with excellent electrical characteristics such as low-noise of 1.131 μVRMS and 32.3% reduction of input capacitance.

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Fabrication of chitosan/Au-TiO2 nanotube-based dry electrodes for electroencephalography recording

Cited by 24 publications

References 38 publications

Dry Electrodes for Human Bioelectrical Signal Monitoring

Dry Electrodes for Human Bioelectrical Signal Monitoring

Towards emerging EEG applications: a novel printable flexible Ag/AgCl dry electrode array for robust recording of EEG signals at forehead sites

Two-Wired Active Spring-Loaded Dry Electrodes for EEG Measurements

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