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Synthesis of sodium cobalt oxide submicron tubules using citric acid-based sol-gel route assisted by porous aluminum oxide membrane

Published online by Cambridge University Press:  01 February 2011

Chia-Jyi Liu ,
Long-Jiann Shih  and
Hsueh-Jung Huang
Chia-Jyi Liu
Affiliation:
[email protected]@yahoo.com, National Changhua University of Education, Changhua, Taiwan, Province of China
Long-Jiann Shih
Affiliation:
[email protected], National Changhua University of Education, Changhua, Taiwan, Province of China
Hsueh-Jung Huang
Affiliation:
[email protected], National Changhua University of Education, Changhua, Taiwan, Province of China
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Abstract

We report synthesis of the sodium cobalt oxide γ-NaxCoO2 submicron tubules using the citric acid-based sol-gel route with the assistance of commercial porous anodized aluminium oxide (AAO) membrane with a nominal pore size of 200nm as supporting templates. The γ-NaxCoO2 submicron tubules can be obtained at 500°C using a rapid-heat-up procedure and held for 30 min. The submicron tubules have a diameter of 200-250 nm. The products are investigated using various techniques including powder x-ray diffraction, field emission scanning electron microscope and transmission electron microscope. The atomic ratio of Na/Co of theγ-NaxCoO2 submicron tubules is determined using energy dispersive x-ray spectra. The atomic ratio of Na/Co tends to be less than 0.5 due to the tendency of Na+ de-intercalating from its parent structure during the tubules collecting process.

Keywords

sol-gelthermoelectricoxide
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1267: Symposium DD – Thermoelectric Materials 2010-Growth, Properties, Novel Characterization Methods and Applications , 2010 , 1267-DD10-26
Copyright
Copyright © Materials Research Society 2010

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