Author:
Kong Zhengyang,Boahen Elvis K.,Lim Hayoung,Kim Do Hwan
Abstract
The development of self-healing electrodes tailored for underwater wearable
sensors is paramount to broaden their applications in aquatic environments.
However, autonomous self-healing of flexible electrodes, which encompasses both
mechanical and electrical performance, remains a formidable challenge. Here, we
present the development of a self-healing flexible electrode (AgNW–FPU),
incorporating Ag nanowires (AgNWs) and a fluorine functionalized polyurethane
(FPU) substrate. The FPU polymer was designed by systematically adjusting the
dynamic bonds and chain mobility to achieve fast self-healing speed and
efficiency. Higher dynamic bond content and good chain mobility led to the
highest self-healing speed, both in air and underwater. The introduction of a
fluorinated side chain enhanced hydrophobicity, further improving underwater
self-healing. The AgNW–FPU electrode demonstrated fast underwater
self-healing, driven by capillary bridges and enhanced contact between fractured
nanowires. The AgNW-FPU electrodes were employed in a capacitive pressure
sensor, showcasing its potential for underwater sensing applications.
Funder
National Research Foundation of Korea
Publisher
Korea Flexible & Printed Electronics Society