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Sensors 2018, 18(4), 1191; https://doi.org/10.3390/s18041191

Fabrication of Flexible Microneedle Array Electrodes for Wearable Bio-Signal Recording

1
Guangdong Provincial Key Laboratory of Sensor Technology and Biomedical Instrument, Sun Yat-Sen University, Guangzhou 510006, China
2
School of Mechanical and Automotive Engineering, South China University of Technology, Guangzhou 510640, China
These authors contributed equally to this work.
*
Author to whom correspondence should be addressed.
Received: 15 March 2018 / Revised: 11 April 2018 / Accepted: 11 April 2018 / Published: 13 April 2018
(This article belongs to the Section Physical Sensors)
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Abstract

Laser-direct writing (LDW) and magneto-rheological drawing lithography (MRDL) have been proposed for the fabrication of a flexible microneedle array electrode (MAE) for wearable bio-signal monitoring. Conductive patterns were directly written onto the flexible polyethylene terephthalate (PET) substrate by LDW. The microneedle array was rapidly drawn and formed from the droplets of curable magnetorheological fluid with the assistance of an external magnetic field by MRDL. A flexible MAE can maintain a stable contact interface with curved human skin due to the flexibility of the PET substrate. Compared with Ag/AgCl electrodes and flexible dry electrodes (FDE), the electrode–skin interface impedance of flexible MAE was the minimum even after a 50-cycle bending test. Flexible MAE can record electromyography (EMG), electroencephalography (EEG) and static electrocardiography (ECG) signals with good fidelity. The main features of the dynamic ECG signal recorded by flexible MAE are the most distinguishable with the least moving artifacts. Flexible MAE is an attractive candidate electrode for wearable bio-signal monitoring. View Full-Text
Keywords: laser-direct writing; magneto-rheological drawing lithography; microneedle array; electrode; bio-signal laser-direct writing; magneto-rheological drawing lithography; microneedle array; electrode; bio-signal
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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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Ren, L.; Xu, S.; Gao, J.; Lin, Z.; Chen, Z.; Liu, B.; Liang, L.; Jiang, L. Fabrication of Flexible Microneedle Array Electrodes for Wearable Bio-Signal Recording. Sensors 2018, 18, 1191.

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