Ultrathin Skin-Conformable Electrodes with High Water Vapor Permeability and Stretchability Composed of Single-Walled Carbon Nanotube Networks Assembled on Elastomeric Films-Reference-Cited by-同舟云学术

Ultrathin Skin-Conformable Electrodes with High Water Vapor Permeability and Stretchability Composed of Single-Walled Carbon Nanotube Networks Assembled on Elastomeric Films

Published:2023-12-06 Issue: Volume: Page:
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Author:

Fujie Toshinori¹^ORCID,Horii Tatsuhiro²,Yamashita Kai²,Ito Marimo²,Okada Kei²

Affiliation:

1. School of Life Science and Technology, Tokyo Institute of Technology

2. Tokyo Institute of Technology

Abstract

Abstract We report on conductive ultrathin films with stretchability and water vapor permeability for skin-conformable bioelectrodes. The films are fabricated by combining conductive fibrous networks of single-wall carbon nanotubes (SWCNTs) and poly(styrene-b-butadiene-b-styrene) (SBS) nanosheets (i.e., SWCNT-SBS nanosheets). The increase in the number of SWCNT coatings raises not only the thickness but also the density of SWCNT bundles. The SBS nanosheet coated with three layers of SWCNTs (i.e., SWCNT 3rd-SBS nanosheet) shows comparable sheet resistance to the SBS nanosheet coated with poly(3,4-ethylenedioxithiophene) doped with poly(4-styrenesulfonate acid) (PEDOT:PSS) containing 5 wt% of butylene glycol (i.e., PEDOT:PSS/BG5-SBS nanosheets) but exhibits a significantly lower elastic modulus and larger elongation at break. Furthermore, the calculated water vapor transmission ratio of the 210 nm-thick SBS nanosheet (268,172 g m-2 (2 h)-1) is higher than that of the filter paper (6345 g m-2 (2 h)-1). The SWCNT 3rd-SBS nanosheet attached to model skin shows a high tolerance to bending and artificial sweat with different pH (i.e., the electrical resistance changes ~1.1 times). Finally, the SWCNT 3rd-SBS nanosheet is applied to detect the surface electromyogram from a subject’s forearm, displaying a similar signal-to-noise ratio as the PEDOT:PSS/BG5-SBS nanosheet.

Publisher

Research Square Platform LLC

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