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- Title
Overcoming the Interfacial Lattice Mismatch: Geometry Control of Gold-Nickel Bimetallic Heteronanostructures.
- Authors
Li, Guangfang Grace; Blom, Douglas A.; Pandey, Shubham; Koch, Robert J.; Misture, Scott T.; Phillpot, Simon R.; Wang, Hui
- Abstract
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, 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. 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.
- Subjects
ELECTRODE reactions; BIMETALLIC catalyst activity; NANOCRYSTAL synthesis; EPITAXIAL layers; LATTICE dynamics
- Publication
Particle & Particle Systems Characterization, 2018, Vol 35, Issue 5, p1
- ISSN
0934-0866
- Publication type
Article
- DOI
10.1002/ppsc.201700361