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

Published online by Cambridge University Press:  31 January 2011

Shinji Fujisaki ,
Koji Hataya ,
Tomohiro Saito ,
Shigeo Arai ,
Yuji Iwamoto  and
Kotaro Kuroda
Shinji Fujisaki*
Affiliation:
Japan Fine Ceramics Center, Atsuta-ku, Nagoya 456-8587, Japan; and Department of Quantum Engineering, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8603, Japan
Koji Hataya
Affiliation:
Japan Fine Ceramics Center, Atsuta-ku, Nagoya 456-8587, Japan; and Department of Materials Science and Engineering, Nagoya Institute of Technology, Gokiso-cho, Showa-ku, Nagoya 466-8555, Japan
Tomohiro Saito
Affiliation:
Japan Fine Ceramics Center, Atsuta-ku, Nagoya 456-8587, Japan
Shigeo Arai
Affiliation:
1M Electron Microscopy Laboratory, Eco Topia Science Institute, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8603, Japan
Yuji Iwamoto
Affiliation:
Japan Fine Ceramics Center, Atsuta-ku, Nagoya 456-8587, Japan; and Department of Materials Science and Engineering, Nagoya Institute of Technology, Gokiso-cho, Showa-ku, Nagoya 466-8555, Japan
Kotaro Kuroda
Affiliation:
Department of Quantum Engineering, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8603, Japan
*
a) Address all correspondence to this author. e-mail: fujisaki@ngk.co.jp Present address: NGK Insulators, Ltd., 2-56 Suda-cho, Mizuho-ku, Nagoya 467-8530, Japan.
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Abstract

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.

Keywords

MicrostructureScanning transmission electron microscopy (STEM)Transmission electron microscopy (TEM)
Type
Articles
Information
Journal of Materials Research , Volume 24 , Issue 2 , February 2009 , pp. 372 - 378
Copyright
Copyright © Materials Research Society 2009

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