Epidermal Electrodes with Ferrimagnetic/Conductive Properties for Biopotential Recordings

Interfacing ultrathin functional films for epidermal applications with external recording instruments or readout electronics still represents one of the biggest challenges in the field of tattoo electronics. With the aim of providing a convenient solution to this ever-present limitation, in this wor...

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Bibliographic Details
Published in:Bioengineering (Basel) 2022-05, Vol.9 (5), p.205
Main Authors: Spanu, Andrea, Taki, Mohamad, Baldazzi, Giulia, Mascia, Antonello, Cosseddu, Piero, Pani, Danilo, Bonfiglio, Annalisa
Format: Article
Language:English
Subjects:
Bioengineering
Conducting polymers
Connectors
ECG recordings
EKG
Electrodes
Electronics
epidermal electrodes
ferrimagnetic conductive films
Interfaces
magnetic connectors
PEDOT:PSS free-standing films
Recording instruments
Screen printing
Sensors
Signal to noise ratio
Thin films
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Summary:Interfacing ultrathin functional films for epidermal applications with external recording instruments or readout electronics still represents one of the biggest challenges in the field of tattoo electronics. With the aim of providing a convenient solution to this ever-present limitation, in this work we propose an innovative free-standing electrode made of a composite thin film based on the combination of the conductive polymer PEDOT:PSS and ferrimagnetic powder. The proposed epidermal electrode can be directly transferred onto the skin and is structured in two parts, namely a conformal conductive part with a thickness of 3 μm and a ferrimagnetic-conductive part that can be conveniently connected using magnetic connections. The films were characterized for ECG recordings, revealing a performance comparable to that of commercial pre-gelled electrodes in terms of cross-spectral coherence, signal-to-noise ratio, and baseline wandering. These new, conductive, magnetically interfaceable, and free-standing conformal films introduce a novel concept in the domain of tattoo electronics and can set the basis for the development of a future family of epidermal devices and electrodes.
ISSN:2306-5354
2306-5354
DOI:10.3390/bioengineering9050205