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Rational Nanoarchitecturing of Coinage Metals via Kinetically Controlled Mass-Limited Reaction with EGaIn
Seung-Beom Shin1, Ga Hye Kim1, Jae-Hyeok Cho1
1School of Advanced Materials Science and Engineering, Sungkyunkwan University, Suwon 16419, Republic of Korea.
Journal of the American Chemical Society
|December 14, 2025
Summary
Scalable synthesis of metallic nanoarchitectures is now possible using kinetically controlled reactions of eutectic gallium-indium nanoparticles (EGaIn NPs) with coinage metals. This method enables the creation of advanced materials for sensors, electronics, and energy applications.
Area of Science:
- Materials Science
- Nanotechnology
- Chemical Engineering
Background:
- Metallic nanoarchitectures are crucial for advanced applications like sensors and electronics.
- Scalable and controlled synthesis of these structures remains a significant challenge.
Purpose of the Study:
- To develop a facile and scalable method for synthesizing metallic nanoarchitectures.
- To rationally design and fabricate porous metallic films and nanowires with controlled properties.
Main Methods:
- Kinetically controlled alloying and dealloying reactions between eutectic gallium-indium nanoparticles (EGaIn NPs) and coinage metals (Cu, Ag, Au) with HCl treatment.
- Utilizing two-dimensional coinage metal thin films with EGaIn NP coating for controlled intermetallic phase formation.
- Employing chemical welding of one-dimensional coinage metal nanowires (NWs) at room temperature.
Main Results:
- Achieved facile, large-scale nanoarchitecturing of Cu, Ag, and Au with minimal volume expansion.
- Fabricated rationally designed porous films and resilient nanowires.
- Developed transparent conductive electrodes from welded silver nanowires (Ag NWs) with a high figure of merit (795.2).
- Created a highly sensitive Ag NW-based strain sensor (gauge factor of 3.67 at 30% strain).
Conclusions:
- Kinetically controlled intermetallic reactions at the nanoscale offer a pathway for next-generation metallic nanoarchitectures.
- The developed method enables rational design and fabrication for diverse technological applications.
- Demonstrated the potential of these nanoarchitectures in high-performance sensors and electrodes.
