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Scalable Synthesis of High Entropy Alloy Nanoparticles by Microwave Heating
Haiyu Qiao1, Mahmoud Tamadoni Saray2, Xizheng Wang1
1Department of Materials Science and Engineering, University of Maryland, College Park, Maryland 20742, United States.
ACS Nano
|August 23, 2021
Summary
This study introduces a scalable microwave heating method for fabricating high entropy alloy nanoparticles (HEA-NPs). This efficient technique utilizes carbon substrates to produce uniform HEA-NPs for advanced applications.
Area of Science:
- Materials Science
- Nanotechnology
- Chemical Engineering
Background:
- High entropy alloy nanoparticles (HEA-NPs) offer superior catalytic and energy storage properties due to multi-element composition.
- Scalable, uniform HEA-NP synthesis is challenging due to high-temperature requirements.
Purpose of the Study:
- To develop an efficient and scalable microwave heating method for fabricating HEA-NPs.
- To demonstrate the fabrication of uniform HEA-NPs using carbon-based substrates.
Main Methods:
- Utilized microwave heating with carbon-based substrates (reduced graphene oxide, carbon nanofibers, carbonized wood).
- Achieved rapid, high-temperature heating (>1400 K, up to ~1850 K) within seconds.
- Synthesized PtPdFeCoNi HEA-NPs as a proof-of-concept.
Main Results:
- Fabricated HEA-NPs with uniform particle size (~12 nm) and homogeneous elemental distribution.
- Demonstrated efficient microwave absorption by carbon substrates for rapid heating.
- Confirmed compatibility with roll-to-roll processing for scalability.
Conclusions:
- The microwave heating method provides a facile and efficient route for scalable HEA-NP manufacturing.
- This approach overcomes limitations of traditional high-temperature synthesis.
- The developed method enables tunable properties and synergistic effects in HEA-NPs.
