The role of gas in determining image quality and resolution during in situ scanning transmission electron microscopy experiments
Abstract
Abstract As gas–solid heterogeneous catalytic reactions are molecular in nature, a full mechanistic understanding of the process requires atomic‐scale characterization under realistic operating conditions. Although atomic resolution imaging has become routine in modern high‐vacuum (scanning) transmission electron microscopy ((S)TEM), both image quality and resolution nominally degrade on introduction of the reaction gases. In this work, we systematically assess the effects of different gases at various pressures on the quality and resolution of images obtained at room temperature in the annular dark field STEM imaging mode by using a differentially pumped (DP) gas cell. This imaging mode is largely free from inelastic scattering effects induced by the presence of gases and retains good imaging properties over a wide range of gas mass/pressures. We demonstrate the application of ESTEM with atomic resolution images for a complex oxide alkane oxidation catalyst MoVNbTeO x (M1) immersed in light and heavy gas environments.
- Authors:
-
- Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
- Pacific Northwest National Lab. (PNNL), Richland, WA (United States); Univ. of Washington, Seattle, WA (United States)
- Publication Date:
- Research Org.:
- Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 1360184
- Alternate Identifier(s):
- OSTI ID: 1393996
- Report Number(s):
- PNNL-SA-126401
Journal ID: ISSN 1867-3880
- Grant/Contract Number:
- AC05-76RL01830; the Chemical Imaging Initiative
- Resource Type:
- Accepted Manuscript
- Journal Name:
- ChemCatChem
- Additional Journal Information:
- Journal Volume: 9; Journal Issue: 18; Journal ID: ISSN 1867-3880
- Publisher:
- ChemPubSoc Europe
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
Citation Formats
Zhu, Yuanyuan, and Browning, Nigel D. The role of gas in determining image quality and resolution during in situ scanning transmission electron microscopy experiments. United States: N. p., 2017.
Web. doi:10.1002/cctc.201700474.
Zhu, Yuanyuan, & Browning, Nigel D. The role of gas in determining image quality and resolution during in situ scanning transmission electron microscopy experiments. United States. https://doi.org/10.1002/cctc.201700474
Zhu, Yuanyuan, and Browning, Nigel D. Wed .
"The role of gas in determining image quality and resolution during in situ scanning transmission electron microscopy experiments". United States. https://doi.org/10.1002/cctc.201700474. https://www.osti.gov/servlets/purl/1360184.
@article{osti_1360184,
title = {The role of gas in determining image quality and resolution during in situ scanning transmission electron microscopy experiments},
author = {Zhu, Yuanyuan and Browning, Nigel D.},
abstractNote = {Abstract As gas–solid heterogeneous catalytic reactions are molecular in nature, a full mechanistic understanding of the process requires atomic‐scale characterization under realistic operating conditions. Although atomic resolution imaging has become routine in modern high‐vacuum (scanning) transmission electron microscopy ((S)TEM), both image quality and resolution nominally degrade on introduction of the reaction gases. In this work, we systematically assess the effects of different gases at various pressures on the quality and resolution of images obtained at room temperature in the annular dark field STEM imaging mode by using a differentially pumped (DP) gas cell. This imaging mode is largely free from inelastic scattering effects induced by the presence of gases and retains good imaging properties over a wide range of gas mass/pressures. We demonstrate the application of ESTEM with atomic resolution images for a complex oxide alkane oxidation catalyst MoVNbTeO x (M1) immersed in light and heavy gas environments.},
doi = {10.1002/cctc.201700474},
journal = {ChemCatChem},
number = 18,
volume = 9,
place = {United States},
year = {Wed May 24 00:00:00 EDT 2017},
month = {Wed May 24 00:00:00 EDT 2017}
}
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