Journal
NANO RESEARCH
Volume 15, Issue 6, Pages 4886-4892Publisher
TSINGHUA UNIV PRESS
DOI: 10.1007/s12274-021-3893-y
Keywords
microwave synthesis; flash heating and cooling; high-entropy alloys; quaternary alloys; metal nanoparticles
Categories
Funding
- National Science Foundation (NSF) of United States under NSF [1946912]
- U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences [DE-AC02-06CH11357]
- DOE Office of Science by Argonne National Laboratory [DE-AC02-06CH11357]
- Div Of Civil, Mechanical, & Manufact Inn
- Directorate For Engineering [1946912] Funding Source: National Science Foundation
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Metal nanoparticles of multi-principal element alloys with a single crystalline phase have been successfully synthesized by microwave-enabled flash heating/cooling method. This approach provides a new way to synthesize single-phase MPEA nanoparticles of many metal combinations under the appropriate conditions of water-in-oil micelle systems and metal precursor reduction reactions.
Metal nanoparticles of multi-principal element alloys (MPEA) with a single crystalline phase have been synthesized by flash heating/cooling of nanosized metals encapsulated in micelle vesicles dispersed in an oil phase (e.g., cyclohexane). Flash heating is realized by selective absorption of a microwave pulse in metals to rapidly heat metals into uniform melts. The oil phase barely absorbs microwave and maintains the low temperature, which can rapidly quench the high-temperature metal melts to enable the flash cooling process. The precursor ions of four metals, including Au, Pt, Pd, and Cu, can be simultaneously reduced by hydrazine in the aqueous solution encapsulated in the micelle vesicles. The resulting metals efficiently absorb microwave energy to locally reach a temperature high enough to melt themselves into a uniform mixture. The duration of microwave pulse is crucial to ensure the reduced metals mix uniformly, while the temperature of oil phase is still low to rapidly quench the metals and freeze the single-phase crystalline lattices in alloy nanoparticles. The microwave-enabled flash heating/cooling provides a new method to synthesize single-phase MPEA nanoparticles of many metal combinations when the appropriate water-in-oil micelle systems and the appropriate reduction reactions of metal precursors are available.
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