Stretchable and Biocompatible Transparent Electrodes for Multimodal Biosignal Sensing from Exposed Skin

Author:

Kim Minji1,Um Hyun‐Kyung2,Choi Haemin3,Lee Jin Sil45,Kim Jihyun1,Kim Kyungjin1,Noh Eunseo1,Han Minwoo3,Lee Hyang Woon6,Choi Won Il4,Lee Seoung Ho3,Lee Jung‐Rok2,Lee Byoung Hoon1ORCID

Affiliation:

1. Department of Chemical Engineering and Materials Science Graduate Program in System Health Science and Engineering Ewha Womans University Seoul 03760 Republic of Korea

2. Division of Mechanical and Biomedical Engineering Graduate Program in Smart Factory Ewha Womans University Seoul 03760 Republic of Korea

3. Department of Chemistry Daegu University Gyeongsan 38453 Republic of Korea

4. Center for Bio‐Healthcare Materials Bio‐Convergence Materials R&D Division Korea Institute of Ceramic Engineering and Technology Chungbuk 28160 Republic of Korea

5. School of Materials Science and Engineering Gwangju Institute of Science and Technology Gwangju 61005 Republic of Korea

6. Departments of Neurology and Medical Science Ewha Womans University School of Medicine and Ewha Medical Research Institute Computational Medicine Graduate Programs in System Health Science and Engineering and Artificial Intelligence Convergence Ewha Womans University Seoul 03765 Republic of Korea

Abstract

AbstractReal‐time health monitoring technology in daily life requires mechanically robust and transparent electrodes for multimodal biosignal sensing from exposed human epidermis. Here, highly stretchable transparent electrodes comprising a water‐dispersed conductive polymer, poly(3,4‐ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS), and a protic ionic liquid (IL), 3‐methylimidazolium:bis(trifluoromethylsulfonyl)amide (p‐MIM:TFSI) are reported. Owing to the high water miscibility of p‐MIM:TFSI and its favorable ion exchange capability with PEDOT:PSS, PEDOT:PSS/p‐MIM:TFSI transparent electrodes show enhanced electrical conductivity (σ = 450 S cm−1) and thin‐film stretchability represented by crack onset strain (εc) exceeding 50%. These electrodes outperform other PEDOT:PSS electrodes processed with an aprotic counterpart, 1‐ethyl‐3‐methylimidazolium(EMIM):TFSI, or a traditional ionic salt, Li:TFSI. The PEDOT:PSS/p‐MIM:TFSI thin‐film electrodes are also biocompatible and conformally adhere to human skin; therefore, multimodal biosignals including electrocardiogram, electrooculogram, and electromyogram with high signal‐to‐noise ratios from exposed epidermis on human faces and arms under various measurement conditions mimicking daily activities are collected. Considering the importance of light penetration through human skin for stable biological activity during biosignal monitoring, the results can broaden the applicability of daily‐use wearable biosignal sensors by applying them to exposed human skin.

Funder

National Research Foundation of Korea

Publisher

Wiley

Subject

Electronic, Optical and Magnetic Materials

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