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Recoverable Liquid Metal Paste with Reversible Rheological Characteristic for Electronics Printing
Hao Chang1,2, Pan Zhang1,3, Rui Guo4
1Beijing Key Lab of CryoBiomedical Engineering and Key Lab of Cryogenics, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, China.
ACS Applied Materials & Interfaces
|February 11, 2020
Summary
Researchers developed a new, recoverable liquid metal paste (Ga-In-SiO2) for soft electronics. This paste offers excellent conductivity and adhesion, with a unique reversible property for material recovery.
Area of Science:
- Materials Science
- Soft Electronics Fabrication
Background:
- Gallium-based liquid metals offer conductivity and flexibility for soft electronics.
- High surface tension and poor adhesion limit their use on various substrates.
- Incorporating metal particles transforms liquid metals into pastes with enhanced properties.
Purpose of the Study:
- To create a novel, recoverable liquid metal paste for improved printing applications.
- To investigate the reversible rheological properties of the new paste.
- To elucidate the adhesion mechanism of liquid metal pastes.
Main Methods:
- Mixing eutectic Ga-In alloy with nonmetallic SiO2 (quartz) particles to form the Ga-In-SiO2 paste (GIS).
- Evaluating the conductivity, printability, and adhesion of the GIS paste.
- Investigating the reversibility of the Ga-In alloy and quartz particle bonding in acidic/alkaline solutions.
- Analyzing adhesion mechanisms, including oxide formation and shearing friction.
Main Results:
- The GIS paste exhibits excellent conductivity and printability, comparable to existing liquid metal pastes.
- The bonding between Ga-In alloy and quartz particles is reversible, allowing for separation and recovery of the alloy.
- Adhesion is significantly influenced by oxide layer formation and shearing friction during extrusion.
- A deeper understanding of liquid metal paste adhesion mechanisms was achieved.
Conclusions:
- A novel, recoverable liquid metal paste (GIS) with reversible rheological properties was successfully developed.
- The GIS paste demonstrates potential for advanced soft electronics fabrication due to its enhanced properties and recoverability.
- This research advances the understanding of liquid metal paste behavior and adhesion principles.
