Journal
SENSORS
Volume 18, Issue 4, Pages -Publisher
MDPI
DOI: 10.3390/s18041191
Keywords
laser-direct writing; magneto-rheological drawing lithography; microneedle array; electrode; bio-signal
Funding
- National Nature Science Foundation of China [51575543]
- Natural Science Foundation of Guangdong Province, China [2014A030313211]
- Science and Technology Planning Project of Guangdong Province, China [2009010057]
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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.
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