Coalescence and sintering of Pt nanoparticles: in situ observation by aberration-corrected HAADF STEM.

M. A. Asoro; D. Kovar; Y. Shao-Horn; L. F. Allard; P. J. Ferreira

doi:10.1088/0957-4484/21/2/025701

Coalescence and sintering of Pt nanoparticles: in situ observation by aberration-corrected HAADF STEM.

M. A. Asoro, D. Kovar, Y. Shao-Horn, L. F. Allard, P. J. Ferreira

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Abstract

An aberration-corrected JEOL 2200FS scanning-transmission electron microscope (STEM), equipped with a high-angle annular dark-field detector (HAADF), is used to monitor the coalescence and sintering of Pt nanoparticles with an average diameter of 2.8 nm. This in situ STEM capability is combined with an analysis methodology that together allows direct measurements of mass transport phenomena that are important in understanding how particle size influences coalescence and sintering at the nanoscale. To demonstrate the feasibility of this methodology, the surface diffusivity is determined from measurements obtained from STEM images acquired during the initial stages of sintering. The measured surface diffusivities are in reasonable agreement with measurements made on the surface of nanoparticles, using other techniques. In addition, the grain boundary mobility is determined from measurements made during the latter stages of sintering.

Original language	English
Pages (from-to)	25701
Number of pages	1
Journal	Nanotechnology
Volume	21
Issue number	2
DOIs	https://doi.org/10.1088/0957-4484/21/2/025701
State	Published - Jan 15 2010
Externally published	Yes

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title = "Coalescence and sintering of Pt nanoparticles: in situ observation by aberration-corrected HAADF STEM.",

abstract = "An aberration-corrected JEOL 2200FS scanning-transmission electron microscope (STEM), equipped with a high-angle annular dark-field detector (HAADF), is used to monitor the coalescence and sintering of Pt nanoparticles with an average diameter of 2.8 nm. This in situ STEM capability is combined with an analysis methodology that together allows direct measurements of mass transport phenomena that are important in understanding how particle size influences coalescence and sintering at the nanoscale. To demonstrate the feasibility of this methodology, the surface diffusivity is determined from measurements obtained from STEM images acquired during the initial stages of sintering. The measured surface diffusivities are in reasonable agreement with measurements made on the surface of nanoparticles, using other techniques. In addition, the grain boundary mobility is determined from measurements made during the latter stages of sintering.",

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T2 - in situ observation by aberration-corrected HAADF STEM.

AU - Asoro, M. A.

AU - Kovar, D.

AU - Shao-Horn, Y.

AU - Allard, L. F.

AU - Ferreira, P. J.

PY - 2010/1/15

Y1 - 2010/1/15

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AB - An aberration-corrected JEOL 2200FS scanning-transmission electron microscope (STEM), equipped with a high-angle annular dark-field detector (HAADF), is used to monitor the coalescence and sintering of Pt nanoparticles with an average diameter of 2.8 nm. This in situ STEM capability is combined with an analysis methodology that together allows direct measurements of mass transport phenomena that are important in understanding how particle size influences coalescence and sintering at the nanoscale. To demonstrate the feasibility of this methodology, the surface diffusivity is determined from measurements obtained from STEM images acquired during the initial stages of sintering. The measured surface diffusivities are in reasonable agreement with measurements made on the surface of nanoparticles, using other techniques. In addition, the grain boundary mobility is determined from measurements made during the latter stages of sintering.

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Coalescence and sintering of Pt nanoparticles: in situ observation by aberration-corrected HAADF STEM.

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