A Discovery of Strong Metal-Support Bonding in Nanoengineered Au-Fe3O4 Dumbbell-like Nanoparticles by in Situ Transmission Electron Microscopy

Chang Wan Han; Tej Choksi; Cory Milligan; Paulami Majumdar; Michael Manto; Yanran Cui; Xiahan Sang; Raymond R. Unocic; Dmitry Zemlyanov; Chao Wang; Fabio H. Ribeiro; Jeffrey Greeley; Volkan Ortalan

doi:10.1021/acs.nanolett.7b00827

A Discovery of Strong Metal-Support Bonding in Nanoengineered Au-Fe₃O₄ Dumbbell-like Nanoparticles by in Situ Transmission Electron Microscopy

Chang Wan Han, Tej Choksi, Cory Milligan, Paulami Majumdar, Michael Manto, Yanran Cui, Xiahan Sang, Raymond R. Unocic, Dmitry Zemlyanov, Chao Wang, Fabio H. Ribeiro, Jeffrey Greeley, Volkan Ortalan

Materials MicroAnalysis

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

30 Scopus citations

Abstract

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 gold thin films 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.

Original language	English
Pages (from-to)	4576-4582
Number of pages	7
Journal	Nano Letters
Volume	17
Issue number	8
DOIs	https://doi.org/10.1021/acs.nanolett.7b00827
State	Published - Aug 9 2017

Bibliographical note

Publisher Copyright:
© 2017 American Chemical Society.

Keywords

Heterogeneous catalysis
density functional theory
electron microscopy
gold catalyst
metalâsupport interaction

Access to Document

10.1021/acs.nanolett.7b00827

Cite this

Han, C. W., Choksi, T., Milligan, C., Majumdar, P., Manto, M., Cui, Y., Sang, X., Unocic, R. R., Zemlyanov, D., Wang, C., Ribeiro, F. H., Greeley, J., & Ortalan, V. (2017). A Discovery of Strong Metal-Support Bonding in Nanoengineered Au-Fe₃O₄ Dumbbell-like Nanoparticles by in Situ Transmission Electron Microscopy. Nano Letters, 17(8), 4576-4582. https://doi.org/10.1021/acs.nanolett.7b00827

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title = "A Discovery of Strong Metal-Support Bonding in Nanoengineered Au-Fe3O4 Dumbbell-like Nanoparticles by in Situ Transmission Electron Microscopy",

abstract = "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 gold thin films 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.",

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author = "Han, {Chang Wan} and Tej Choksi and Cory Milligan and Paulami Majumdar and Michael Manto and Yanran Cui and Xiahan Sang and Unocic, {Raymond R.} and Dmitry Zemlyanov and Chao Wang and Ribeiro, {Fabio H.} and Jeffrey Greeley and Volkan Ortalan",

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Han, CW, Choksi, T, Milligan, C, Majumdar, P, Manto, M, Cui, Y, Sang, X, Unocic, RR, Zemlyanov, D, Wang, C, Ribeiro, FH, Greeley, J & Ortalan, V 2017, 'A Discovery of Strong Metal-Support Bonding in Nanoengineered Au-Fe₃O₄ Dumbbell-like Nanoparticles by in Situ Transmission Electron Microscopy', Nano Letters, vol. 17, no. 8, pp. 4576-4582. https://doi.org/10.1021/acs.nanolett.7b00827

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AU - Han, Chang Wan

AU - Choksi, Tej

AU - Milligan, Cory

AU - Majumdar, Paulami

AU - Manto, Michael

AU - Cui, Yanran

AU - Sang, Xiahan

AU - Unocic, Raymond R.

AU - Zemlyanov, Dmitry

AU - Wang, Chao

AU - Ribeiro, Fabio H.

AU - Greeley, Jeffrey

AU - Ortalan, Volkan

PY - 2017/8/9

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N2 - 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 gold thin films 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.

AB - 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 gold thin films 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.

KW - Heterogeneous catalysis

KW - density functional theory

KW - electron microscopy

KW - gold catalyst

KW - metalâsupport interaction

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