Nanoparticle Metamorphosis: An in Situ High-Temperature Transmission Electron Microscopy Study of the Structural Evolution of Heterogeneous Au:Fe 2 O 3 Nanoparticles

William J. Baumgardner; Yingchao Yu; Robert Hovden; Shreyas Honrao; Richard G. Hennig; Héctor D. Abruña; David A. Muller; Tobias Hanrath

doi:10.1021/nn501543d

Nanoparticle Metamorphosis: An in Situ High-Temperature Transmission Electron Microscopy Study of the Structural Evolution of Heterogeneous Au:Fe 2 O 3 Nanoparticles

William J. Baumgardner, Yingchao Yu, Robert Hovden, Shreyas Honrao, Richard G. Hennig, Héctor D. Abruña, David A. Muller, Tobias Hanrath

Research output: Contribution to journal › Article › peer-review

12 Scopus citations

Abstract

High-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.

Original language	English (US)
Pages (from-to)	5315-5322
Number of pages	8
Journal	ACS Nano
Volume	8
Issue number	5
DOIs	https://doi.org/10.1021/nn501543d
State	Published - May 5 2014
Externally published	Yes

Bibliographical note

KAUST Repository Item: Exported on 2020-10-01
Acknowledged KAUST grant number(s): KUS-C1-018-02
Acknowledgements: We 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.
This publication acknowledges KAUST support, but has no KAUST affiliated authors.

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title = "Nanoparticle Metamorphosis: An in Situ High-Temperature Transmission Electron Microscopy Study of the Structural Evolution of Heterogeneous Au:Fe 2 O 3 Nanoparticles",

abstract = "High-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. {\textcopyright} 2014 American Chemical Society.",

author = "Baumgardner, {William J.} and Yingchao Yu and Robert Hovden and Shreyas Honrao and Hennig, {Richard G.} and Abru{\~n}a, {H{\'e}ctor D.} and Muller, {David A.} and Tobias Hanrath",

note = "KAUST Repository Item: Exported on 2020-10-01 Acknowledged KAUST grant number(s): KUS-C1-018-02 Acknowledgements: We 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. This publication acknowledges KAUST support, but has no KAUST affiliated authors.",

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AU - Hovden, Robert

AU - Honrao, Shreyas

AU - Hennig, Richard G.

AU - Abruña, Héctor D.

AU - Muller, David A.

AU - Hanrath, Tobias

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Nanoparticle Metamorphosis: An in Situ High-Temperature Transmission Electron Microscopy Study of the Structural Evolution of Heterogeneous Au:Fe 2 O 3 Nanoparticles

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