Time Resolved Annular Dark Field Imaging of Catalyst Nanoparticles
Journal Article
·
· ChemPhysChem
OSTI ID:986067
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.
- Research Organization:
- Lawrence Livermore National Laboratory (LLNL), Livermore, CA
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- W-7405-ENG-48
- OSTI ID:
- 986067
- Report Number(s):
- LLNL-JRNL-415335
- Journal Information:
- ChemPhysChem, Journal Name: ChemPhysChem Journal Issue: 10 Vol. 11; ISSN CPCHFT; ISSN 1439-4235
- Country of Publication:
- United States
- Language:
- English
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