Abstract
Ultrathin sensing devices utilizing piezoelectric materials have emerged as potential candidates to develop highly skin-conformable and energy-efficient continuous biosignal monitoring systems. However, biocompatible, cost-efficient, and simple fabrication processes still need to be investigated to enable wider adoption of such devices. This study proposes a simple two-step printing process for the fabrication of a piezoelectric biosignal sensor that utilizes readily available and biocompatible polymer-based materials for the substrate (i.e., Parylene-C), electroactive layer (i.e., poly(vinylidene fluoride-trifluoroethylene) (PVDF-TrFE)), and interdigitated electrodes (i.e., poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS)). The proposed interdigitated electrode architecture improves upon the conventional metal–insulator–metal architecture by (1) increasing the thickness-normalized output voltage and (2) enabling the detection of bending orientation. The performance of the proposed sensor structure is demonstrated with the measurement of the arterial pulse waveform signal and limb movement detection. The presented results pave the way for cost-effective and continuous unobtrusive on-skin biosignal monitoring.
Highlights
The development of ultrathin sensing devices has become a topic of particular interest in the field of flexible wearable electronics, which have the potential to revolutionize wearable electronic systems especially for health monitoring applications.[1]
The ultrathin piezoelectric sensor was fabricated as follows: an interdigitated electrode (IDE) pattern was inkjet-printed using PEDOT:PSS onto an ultrathin UV/ozone-treated Parylene-C layer (≈2 μm) substrate, and a P(VDF-TrFE) layer was bar-coated on top of the electrodes
In the case of piezoelectric sensors based on IDE structures, the requirement of uniform electrodes is vital to ensure a homogeneous distribution of the applied electric field during the poling process
Summary
The development of ultrathin (thickness
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