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Title: Overcoming the Interfacial Lattice Mismatch: Geometry Control of Gold-Nickel Bimetallic Heteronanostructures

Journal Article · · Particle & Particle Systems Characterization

Seed-mediated heteroepitaxial growth provides a versatile synthetic approach to a diverse set of geometrically distinct bimetallic heteronanostructures. In bimetallic nanocrystal systems, interfacial heteroepitaxial growth typically occurs between structurally similar metals with lattice mismatch below 5%, whereas controlled epitaxial growth of bimetallic nanocrystals comprising metals with larger lattice mismatches or even dissimilar crystalline structures has long been challenging. Here in this work, the epitaxial growth of both face-centered cubic (fcc) and hexagonal close-packed (hcp) Ni on fcc Au nanocrystal seeds in polyol solvents is systematically investigated, to shed light on the complex mechanisms underpinning the intriguing geometric evolution of lattice-mismatched bimetallic nanocrystals during seed-mediated heteroepitaxial overgrowth. The success in geometry-controlled syntheses of a series of Au–Ni bimetallic heteronanostructures, such as conformal core–shell nanoparticles, asymmetric heterodimers, and multibranched core–satellite nanocrystals, represents a significant step toward the extension of nanoscale interfacial heteroepitaxy from lattice-matched bimetallic systems to the ones exhibiting large lattice mismatches and even dissimilar crystalline structures. In conclusion, the insights gained from this work serve as a central design principle that guides the development of new synthetic approaches to architecturally sophisticated and compositionally diverse multimetallic heteronanostructures.

Research Organization:
Energy Frontier Research Centers (EFRC) (United States). Center for Hierarchical Waste Form Materials (CHWM)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
SC0016574
OSTI ID:
1470189
Alternate ID(s):
OSTI ID: 1414965
Journal Information:
Particle & Particle Systems Characterization, Vol. 35, Issue 5; ISSN 0934-0866
Publisher:
WileyCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 8 works
Citation information provided by
Web of Science

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