Monolithically Programmed Stretchable Conductor by Laser-Induced Entanglement of Liquid Metal and Metallic Nanowire...

Area of Science:

• Materials Science
• Nanotechnology
• Electronics Engineering

Background:

• Liquid metals offer low mechanical compliance, ideal for stretchable electronics and wearables.
• Limitations include invariable strain-resistance behavior and difficulties in circuit patterning, hindering strain-insensitive applications.
• Existing stretchable electrodes face challenges in achieving controlled strain-resistance characteristics and direct patterning.

Purpose of the Study:

• To develop novel liquid-metal-based electrodes with programmable strain-resistance characteristics for stretchable electronics.
• To overcome the limitations of liquid metals in strain-insensitive wiring and direct circuit patterning.
• To create a versatile platform for fabricating complex stretchable circuitry.

Main Methods:

• Fabrication of a biphasic metallic composite (BMC) using fragmented eutectic gallium-indium alloy (EGaIn) and a silver nanowire (AgNW) backbone.
• Controlled entanglement of EGaIn and AgNW via laser-induced photothermal reaction for direct patterning.
• Characterization of the BMC's structure, conductivity, adhesion, and strain-resistance properties.

Main Results:

• The BMC ensures uniform and durable electrode formation on stretchable substrates.
• Laser-induced photothermal reaction enhances substrate adhesion and modifies BMC structure.
• Controlled EGaIn-AgNW entanglement allows regulation of conductivity and gauge factor, achieving strain-insensitivity.

Conclusions:

• The developed fragmented liquid metal and AgNW composite electrodes offer tunable strain-resistance properties.
• The laser-based patterning method enables direct and rapid fabrication of stretchable circuitry.
• This approach provides a new pathway for creating complex, strain-insensitive stretchable electronic devices.