Nanostructural characterizations of hydrogen-permselective Si–Co–O membranes by transmission electron microscopy

Nanostructural characterizations of liquid metal–organic precursors-derived cobalt-doped amorphous silica (Si–Co–O) membranes supported on a mesoporous anodic alumina capillary (MAAC) tube were performed to study their unique high-temperature hydrogen gas permeation properties. Cross-sectional scann...

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Bibliographic Details
Published in:Journal of materials research 2009-02, Vol.24 (2), p.372-378
Main Authors: Fujisaki, Shinji, Hataya, Koji, Saito, Tomohiro, Arai, Shigeo, Iwamoto, Yuji, Kuroda, Kotaro
Format: Article
Language:English
Subjects:
Applied and Technical Physics
Biomaterials
Inorganic Chemistry
Materials Engineering
Materials Science
Microstructure
Nanotechnology
Scanning transmission electron microscopy (STEM)
Transmission electron microscopy (TEM)
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Summary:Nanostructural characterizations of liquid metal–organic precursors-derived cobalt-doped amorphous silica (Si–Co–O) membranes supported on a mesoporous anodic alumina capillary (MAAC) tube were performed to study their unique high-temperature hydrogen gas permeation properties. Cross-sectional scanning transmission electron microscopy images and selected-area electron diffraction patterns indicated that the metal cobalt and the different oxidation states of cobalt oxides (CoO and Co3O4) nanocrystallites having a size range of 5–20 nm were in situ formed in the mesopore channels of the MAAC tube. In addition, high-resolution transmission electron microscopy micrographs and electron energy loss spectroscopy elemental mapping images indicated that the highly dense Co-doped amorphous Si–O formed within the mesopore channels of the MAAC tube. These nanostructural features could contribute to the hydrogen-selective permeation properties observed for the membranes.
ISSN:0884-2914
2044-5326
DOI:10.1557/JMR.2009.0038