Nanoparticle Metamorphosis: An in Situ High-Temperature Transmission Electron Microscopy Study of the Structural Evolution of Heterogeneous Au:Fe 2 O 3 Nanoparticles
AuthorsBaumgardner, William J.
Hennig, Richard G.
Abruña, Héctor D.
KAUST Grant NumberKUS-C1-018-02
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AbstractHigh-temperature in situ electron microscopy and X-ray diffraction have revealed that Au and Fe2O3 particles fuse in a fluid fashion at temperatures far below their size-reduced melting points. With increasing temperature, the fused particles undergo a sequence of complex structural transformations from surface alloy to phase segregated and ultimately core-shell structures. The combination of in situ electron microscopy and spectroscopy provides insights into fundamental thermodynamic and kinetic aspects governing the formation of heterogeneous nanostructures. The observed structural transformations present an interesting analogy to thin film growth on the curved surface of a nanoparticle. Using single-particle observations, we constructed a phase diagram illustrating the complex relationships among composition, morphology, temperature, and particle size. © 2014 American Chemical Society.
CitationBaumgardner WJ, Yu Y, Hovden R, Honrao S, Hennig RG, et al. (2014) Nanoparticle Metamorphosis: An in Situ High-Temperature Transmission Electron Microscopy Study of the Structural Evolution of Heterogeneous Au:Fe 2 O 3 Nanoparticles . ACS Nano 8: 5315–5322. Available: http://dx.doi.org/10.1021/nn501543d.
SponsorsWe acknowledge the assistance from John Grazul and Mick Thomas from the electron microscopy facility at Cornell, as well as John Damiano from Protochips Inc. This work used the C1 beamline at the Cornell High Energy Synchrotron Source (NSF DMR-09262384). W.B. was supported by Award No. KUS-C1-018-02, granted by King Abdullah University of Science and Technology (KAUST). Y.Y. and S.H. are supported by the Energy Materials Center at Cornell (EMC2), an Energy Frontier Research Center funded by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, under Award Number DE-SC0001086. This work made use of the electron microscopy and X-ray diffraction facilities of the Cornell Center for Materials Research (CCMR), an NSF-supported MRSEC through Grant DMR-1120296.
PublisherAmerican Chemical Society (ACS)
CollectionsPublications Acknowledging KAUST Support
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