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Revealing the Cluster-Cloud and Its Role in Nanocrystallization
Biao Jin1, Yanming Wang2, Zhaoming Liu1
1Department of Chemistry, Zhejiang University, Hangzhou, Zhejiang, 310027, China.
Advanced Materials (Deerfield Beach, Fla.)
|March 9, 2019
Summary
Researchers discovered a novel "cluster-cloud" intermediate state during nanocrystal formation. This cluster-cloud mediates nucleation and particle maturation, offering new insights into crystallization mechanisms for improved synthesis.
Area of Science:
- Materials Science
- Nanotechnology
- Physical Chemistry
Background:
- Understanding early-stage crystallization from supersaturated solutions is crucial but challenging.
- Nanocrystal synthesis requires precise control over nucleation and growth mechanisms.
Purpose of the Study:
- To elucidate the intermediate states and mechanisms governing nanocrystallization.
- To investigate the role of atomic clusters in the formation of palladium (Pd) and gold (Au) nanoparticles.
Main Methods:
- In situ liquid cell transmission electron microscopy (LCTEM) for real-time observation.
- Atomistic simulations to complement experimental findings.
Main Results:
- Identification of a novel intermediate state termed
- cluster-cloud
- during Pd and Au crystallization.
- Nucleation initiated by cluster-cloud collapse, forming initial nanoparticles.
- Particle maturation via cluster-cloud relaxations, progressing from poor crystallinity to single-crystal phase.
Conclusions:
- Cluster-cloud-mediated nanocrystallization involves energetically favored order-disorder phase separation and reconstruction.
- Provides new insights into fundamental nanocrystallization mechanisms.
- Offers valuable information for optimizing nanocrystal synthesis pathways.
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