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Electrocardiogram measurements in water using poly(3,4-ethylene dioxythiophene):poly(styrene sulfonate) nanosheets waterproofed by polyurethane film

Published online by Cambridge University Press:  01 October 2020

Sho Mihara ,
Hui-Lin Lee  and
Shinji Takeoka
Sho Mihara
Affiliation:
Graduate School of Advanced Science and Engineering, Waseda University, Tokyo162-8480, Japan Waseda Research Institute for Science and Engineering, Waseda University, Tokyo169-8555, Japan
Hui-Lin Lee
Affiliation:
School of Chemical & Life Sciences, Singapore Polytechnic, 500 Dover Road, Singapore139651, Singapore
Shinji Takeoka*
Affiliation:
Waseda Research Institute for Science and Engineering, Waseda University, Tokyo169-8555, Japan Faculty of Science and Engineering, Waseda University, Tokyo169-8555, Japan
*
Address all correspondence to Shinji Takeoka at takeoka@waseda.jp
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Abstract

Waterproof bioelectrodes enable long-term biological monitoring and the assessment of performances of athletes in water. Existing gel electrodes change their electrical properties even when covered with a waterproof film. Here, the authors present the poly(3,4-ethylene dioxythiophene):poly(styrene sulfonate) (PEDOT:PSS)/poly(styrene-butadiene-styrene) (SBS) bi-layer nanosheet and waterproof film for a comfortable waterproof bioelectrode. PEDOT:PSS/SBS is fully foldable with a conductivity loss of only 5%. This foldable nanosheet electrode provides a reliable electrical connection between the skin and the wire. The waterproof film-covered bioelectrode enables continuous monitoring of electrocardiograms in water, showing a signal-to-noise ratio of 21.5 dB for the R wave and 17.5 dB for the T wave, comparable to atmospheric measurements, and sensing a change in heart rate from 79 to 131 bpm during bathing.

Type
Research Letters
Information
MRS Communications , Volume 10 , Issue 4 , December 2020 , pp. 628 - 635
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Copyright
Copyright © The Author(s), 2020, published on behalf of Materials Research Society by Cambridge University Press

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