A Surface Conformal Laser-Assisted Alloying Reaction for 3D-Printable Solid/Liquid Biphasic Conductors.

Area of Science:

• Materials Science
• Additive Manufacturing
• Nanotechnology

Background:

• Electronics research is advancing towards form-factor-free devices.
• 3D printing is a key technique for fabricating complex circuit designs.

Purpose of the Study:

• To propose a 3D-printable metallic ink for creating arbitrarily designable solid/liquid biphasic conductors.
• To investigate the self-healing, chip-bonding, and non-flood-out properties of these conductors.
• To explore the unique electrical properties of the resulting biphasic conductors.

Main Methods:

• Fabrication of a 3D-printable metallic ink using multidimensional eutectic gallium indium (EGaIn)/Ag hierarchical particles.
• Optical and photothermal simulation studies to understand particle behavior and energy transfer.
• 3D surface conformal green laser irradiation to activate the biphasic conductive layer.
• Chemical and physical evolution analysis of the conductive layer.

Main Results:

• The proposed ink enables the fabrication of designable solid/liquid biphasic conductors.
• These conductors exhibit inherent self-healing and chip-bonding capabilities without liquid flood out.
• EGaIn/Ag particles show plasmonic optical absorption and efficient thermal energy transfer.
• Green laser irradiation successfully transforms the insulating particulate layer into a conductive biphasic layer.
• The resulting conductors demonstrate novel electrical properties previously unobserved in solid metallic conductors.

Conclusions:

• A novel 3D-printable metallic ink with EGaIn/Ag hierarchical particles facilitates the creation of advanced biphasic conductors.
• The developed process, combining 3D printing and laser irradiation, yields conductors with unique self-healing and electrical characteristics.
• This technology offers a promising platform for form-factor-free electronic devices.