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Sensors 2016, 16(11), 1826; doi:10.3390/s16111826

New Flexible Silicone-Based EEG Dry Sensor Material Compositions Exhibiting Improvements in Lifespan, Conductivity, and Reliability

1
Department of Interactive Entertainment Design, China University of Technology, Taipei 11695, Taiwan
2
Department of Mechanical Engineering, National Taiwan University of Science and Technology, Taipei 10607, Taiwan
3
Brain Research Center, National Chiao Tung University, Hsinchu 300, Taiwan
4
Faculty of Engineering and Information Technology, University of Technology, Sydney 2007, Australia
5
Translational Neuroscience Branch, Human Research and Engineering Directorate, U.S. Army Research Laboratory, Adelphi, MD 20783, USA
6
Macromolecular Science and Technology Branch, Weapons and Materials Research Directorate, U.S. Army Research Laboratory, Adelphi, MD 20783, USA
*
Author to whom correspondence should be addressed.
Academic Editor: Alexander Star
Received: 13 June 2016 / Revised: 15 October 2016 / Accepted: 22 October 2016 / Published: 31 October 2016
(This article belongs to the Section Biosensors)
View Full-Text   |   Download PDF [5935 KB, uploaded 1 November 2016]   |  

Abstract

This study investigates alternative material compositions for flexible silicone-based dry electroencephalography (EEG) electrodes to improve the performance lifespan while maintaining high-fidelity transmission of EEG signals. Electrode materials were fabricated with varying concentrations of silver-coated silica and silver flakes to evaluate their electrical, mechanical, and EEG transmission performance. Scanning electron microscope (SEM) analysis of the initial electrode development identified some weak points in the sensors’ construction, including particle pull-out and ablation of the silver coating on the silica filler. The newly-developed sensor materials achieved significant improvement in EEG measurements while maintaining the advantages of previous silicone-based electrodes, including flexibility and non-toxicity. The experimental results indicated that the proposed electrodes maintained suitable performance even after exposure to temperature fluctuations, 85% relative humidity, and enhanced corrosion conditions demonstrating improvements in the environmental stability. Fabricated flat (forehead) and acicular (hairy sites) electrodes composed of the optimum identified formulation exhibited low impedance and reliable EEG measurement; some initial human experiments demonstrate the feasibility of using these silicone-based electrodes for typical lab data collection applications. View Full-Text
Keywords: electroencephalography (EEG); scanning electron microscope (SEM); silicone-based dry sensors electroencephalography (EEG); scanning electron microscope (SEM); silicone-based dry sensors
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Yu, Y.-H.; Chen, S.-H.; Chang, C.-L.; Lin, C.-T.; Hairston, W.D.; Mrozek, R.A. New Flexible Silicone-Based EEG Dry Sensor Material Compositions Exhibiting Improvements in Lifespan, Conductivity, and Reliability. Sensors 2016, 16, 1826.

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