A Discovery of Strong Metal–Support Bonding in Nanoengineered Au–Fe 3 O 4 Dumbbell-like Nanoparticles by in Situ Transmission Electron Microscopy
- Purdue Univ., West Lafayette, IN (United States)
- Johns Hopkins Univ., Baltimore, MD (United States). Dept. of Chemical and Biomolecular Engineering
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Science (CNMS)
The strength of metal-support bonding in heterogeneous catalysts determines their thermal stability, therefore, a tremendous amount of effort has been expended to understand metal-support interactions. Herein, we report the discovery of an anomalous “strong metal-support bonding” between gold nanoparticles and “nano-engineered” Fe3O4 substrates by in-situ microscopy. During in-situ vacuum annealing of Au-Fe3O4 dumbbell-like nanoparticles, synthesized by the epitaxial growth of nano-Fe3O4 on Au nanoparticles, the gold nanoparticles transform into the monolayered gold thinfilms and wet the surface of nano-Fe3O4, as the surface reduction of nano-Fe3O4 proceeds. This phenomenon results from a unique coupling of the size-and shape-dependent high surface reducibility of nano-Fe3O4 and the extremely strong adhesion between Au and the reduced Fe3O4. This strong-metal support bonding reveals the significance of controlling the metal oxide support size and morphology for optimizing metal-support bonding and, ultimately, for the development of improved catalysts and functional nanostructures.
- Research Organization:
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC)
- Grant/Contract Number:
- AC05-00OR22725
- OSTI ID:
- 1399979
- Journal Information:
- Nano Letters, Vol. 17, Issue 8; ISSN 1530-6984
- Publisher:
- American Chemical SocietyCopyright Statement
- Country of Publication:
- United States
- Language:
- English
Web of Science
Recent Advances in Magnetite Nanoparticle Functionalization for Nanomedicine
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journal | December 2019 |
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