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Characterization of a Novel Polypyrrole (PPy) Conductive Polymer Coated Patterned Vertical CNT (pvCNT) Dry ECG Electrode

Department of Electrical and Computer Engineering, The University of Memphis, Memphis, TN 38152, USA
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Chemosensors 2018, 6(3), 27; https://doi.org/10.3390/chemosensors6030027
Received: 13 June 2018 / Revised: 6 July 2018 / Accepted: 10 July 2018 / Published: 17 July 2018
(This article belongs to the Special Issue Carbon Nanotube Sensors)
Conventional electrode-based technologies, such as the electrocardiogram (ECG), capture physiological signals using an electrolyte solution or gel that evaporates shortly after exposure, resulting in a decrease in the quality of the signal. Previously, we reported a novel dry impedimetric electrode using patterned vertically-aligned Carbon NanoTubes (pvCNT) for biopotential measurement applications. The mechanical adhesion strength of the pvCNT electrode to the substrate was weak, hence, we have improved this electrode using a thin coating of the conductive polymer polypyrrole (PPy) that strengthens its mechanical properties. Multiwall CNTs were grown vertically on a circular stainless-steel disc (⌀ = 10 mm) substrate of 50 µm thickness forming patterned pillars on a square base (100 µm × 100 µm) with an inter-pillar spacing of 200 µm and height up to 1.5 mm. The PPy coating procedure involves applying 10 µL of PPy mixed with 70% ethyl alcohol solution and rapid drying at 300 °C using a hot air gun at a distance of 10 cm. A comparative study demonstrated that the coated pvCNT had higher impedance compared to a non-coated pvCNT but lower impedance compared to the standard gel electrode. The PPy-coated pvCNT had comparable signal capture quality but stronger mechanical adhesion to the substrate. View Full-Text
Keywords: dry ECG electrode; impedimetric electrode; carbon nanotube (CNT); pvCNT electrode; polypyrrole (PPy) coating dry ECG electrode; impedimetric electrode; carbon nanotube (CNT); pvCNT electrode; polypyrrole (PPy) coating
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Abu-Saude, M.; Morshed, B.I. Characterization of a Novel Polypyrrole (PPy) Conductive Polymer Coated Patterned Vertical CNT (pvCNT) Dry ECG Electrode. Chemosensors 2018, 6, 27.

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