Healable and flexible transparent heaters

Area of Science:

• Materials Science
• Nanotechnology
• Polymer Chemistry

Background:

• Mechanical fracture of electrical conductors limits flexible electronics.
• Need for robust, transparent, and self-healing materials in wearable devices.

Purpose of the Study:

• Develop transparent and healable electrodes for flexible electronics.
• Investigate the performance and self-healing properties of novel composite electrodes.

Main Methods:

• Fabrication of electrodes using a silver nanowire (AgNW) network on a polyurethane film modified with Diels-Alder adducts (PU-DA).
• Surface modification with hydrophilic molecules to enhance AgNW adhesion.
• Characterization of electrical, optical, mechanical, and thermal properties.
• Testing of self-healing capabilities after mechanical damage.

Main Results:

• Achieved mechanically robust flexible electrodes with a figure of merit of 13.3 Ω □⁻¹ and 77% transmittance at 550 nm.
• Fabricated transparent and flexible healable heaters (TFHH) with high Joule heating (102 °C at 6 V) and fast thermal response (150 s).
• Demonstrated excellent durability over 500 bending cycles and self-healing of conductivity after knife damage via heat treatment (120 °C) or electrical power.

Conclusions:

• The developed PU-DA composite electrodes provide a promising solution for durable, high-performance flexible electronics.
• The self-healing capability significantly enhances the longevity and reliability of flexible devices.
• Potential applications include thermochromics, displays, and defrosters.