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

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...

Full description

Saved in:
Bibliographic Details
Published in:Nanotechnology 2010-01, Vol.21 (2), p.025701-025701
Main Authors: Asoro, M A, Kovar, D, Shao-Horn, Y, Allard, L F, Ferreira, P J
Format: Article
Language:English
Subjects:
Aberration
Coalescence
Coalescing
Crystallization - methods
Hot Temperature
Image Enhancement - methods
Macromolecular Substances - chemistry
Materials Testing - methods
Methodology
Microscopy, Electron, Scanning Transmission - methods
Molecular Conformation
Nanoparticles
Nanoparticles - chemistry
Nanoparticles - ultrastructure
Nanostructure
Nanotechnology - methods
Particle Size
Platinum - chemistry
Scanning transmission electron microscopy
Sintering
Surface Properties
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary: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.
ISSN:0957-4484
1361-6528
DOI:10.1088/0957-4484/21/2/025701