skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Time Resolved Annular Dark Field Imaging of Catalyst Nanoparticles

Abstract

Dynamic transmission electron microscopy (DTEM) has the potential to provide insight into nanoparticle catalyst dynamics by obtaining direct images with high spatial and temporal resolution. To date, the limited signal to noise ratios attainable for dispersed nanoparticle samples have made such studies difficult to perform at the highest resolution. These limitations have been overcome by the fabrication of an annular objective lens aperture that permits images to be obtained with a 5 fold increase in the signal to background ratio. This annular dark field imaging mode is shown here to vastly improve the contrast attainable in 15ns pulsed electron images and allows particles as small as 30nm in diameter to be observed.

Authors:
; ; ; ; ;
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
986067
Report Number(s):
LLNL-JRNL-415335
Journal ID: ISSN 1439-4235; CPCHFT; TRN: US201017%%126
DOE Contract Number:  
W-7405-ENG-48
Resource Type:
Journal Article
Journal Name:
ChemPhysChem
Additional Journal Information:
Journal Volume: 11; Journal Issue: 10; Journal ID: ISSN 1439-4235
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; APERTURES; CATALYSTS; ELECTRONS; FABRICATION; RESOLUTION; TRANSMISSION ELECTRON MICROSCOPY

Citation Formats

Masiel, D J, Reed, B W, LaGrange, T B, Campbell, G H, Guo, T, and Browning, N D. Time Resolved Annular Dark Field Imaging of Catalyst Nanoparticles. United States: N. p., 2009. Web.
Masiel, D J, Reed, B W, LaGrange, T B, Campbell, G H, Guo, T, & Browning, N D. Time Resolved Annular Dark Field Imaging of Catalyst Nanoparticles. United States.
Masiel, D J, Reed, B W, LaGrange, T B, Campbell, G H, Guo, T, and Browning, N D. 2009. "Time Resolved Annular Dark Field Imaging of Catalyst Nanoparticles". United States. https://www.osti.gov/servlets/purl/986067.
@article{osti_986067,
title = {Time Resolved Annular Dark Field Imaging of Catalyst Nanoparticles},
author = {Masiel, D J and Reed, B W and LaGrange, T B and Campbell, G H and Guo, T and Browning, N D},
abstractNote = {Dynamic transmission electron microscopy (DTEM) has the potential to provide insight into nanoparticle catalyst dynamics by obtaining direct images with high spatial and temporal resolution. To date, the limited signal to noise ratios attainable for dispersed nanoparticle samples have made such studies difficult to perform at the highest resolution. These limitations have been overcome by the fabrication of an annular objective lens aperture that permits images to be obtained with a 5 fold increase in the signal to background ratio. This annular dark field imaging mode is shown here to vastly improve the contrast attainable in 15ns pulsed electron images and allows particles as small as 30nm in diameter to be observed.},
doi = {},
url = {https://www.osti.gov/biblio/986067}, journal = {ChemPhysChem},
issn = {1439-4235},
number = 10,
volume = 11,
place = {United States},
year = {Tue Aug 04 00:00:00 EDT 2009},
month = {Tue Aug 04 00:00:00 EDT 2009}
}