Water-repellent and self-attachable flexible conductive patch

Achieving exceptional water-repellency and reliable reversible adhesion is crucial for the development of wearable flexible electronics. However, simultaneously achieving these properties presents a significant challenge, as water-repellency requires maximizing the presence of air while robust adhes...

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Bibliographic Details
Published in:Applied physics letters 2023-08, Vol.123 (7)
Main Authors: Park, Seongjin, Kim, Jaeil, Lee, Sang-Hyeon, Kim, Jinseo, Kang, Dong Kwan, Kim, Somi, Jung, Ho-Sup, Jeong, Hoon Eui
Format: Article
Language:English
Subjects:
Adhesive strength
Applied physics
Carbon nanotubes
Contact angle
Distributed generation
Electric contacts
Electrical resistivity
Flexible components
Hydrophobicity
Percolation
Robustness
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Summary:Achieving exceptional water-repellency and reliable reversible adhesion is crucial for the development of wearable flexible electronics. However, simultaneously achieving these properties presents a significant challenge, as water-repellency requires maximizing the presence of air while robust adhesion necessitates enhancing the solid fraction. In this study, we present a flexible and transparent conductive patch that addresses this challenge by offering simultaneous robust superhydrophobicity and strong adhesion in both dry and wet conditions. The device incorporates a unique combination of overhang micropillars, microgrids and a percolating network of carbon nanotubes. The proposed patch demonstrates outstanding water repellency with a contact angle exceeding 150°, while delivering impressive dry adhesion (>200 kPa) and wet adhesion (>150 kPa) performance. Furthermore, the device exhibits tunable electrical conductivity and optical transmittance.
ISSN:0003-6951
1077-3118
DOI:10.1063/5.0160217