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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:
liucj@cc.ncue.edu.twncuecj@yahoo.com, National Changhua University of Education, Changhua, Taiwan, Province of China
Long-Jiann Shih
Affiliation:
wslion12@yahoo.com.tw, National Changhua University of Education, Changhua, Taiwan, Province of China
Hsueh-Jung Huang
Affiliation:
a0720sophia@yahoo.com.tw, 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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References

1 Terasaki, I. Sasago, Y. Uchinokura, K. Phys. Rev. B56, R12685 (1997).Google Scholar
2 Fujita, K. Mochida, T. Nakamura, K. Jpn. J. Appl. Phys. 40, 4644 (2001).Google Scholar
3 Fouassier, C. Matejka, G. Reau, J.M. Hagenmuller, P. Solid, P. J. State Chem. 6, 532 (1973).Google Scholar
4 Hahn, T. in International Tables for Crystallography; Space-Group Symmetry Vol. A (D. Reidel Publishing Company, 1983) pp. 590–591.Google Scholar
5 Takada, K. Sakurai, H. Takayama-Muromachi, E., Izumi, F. Dilanian, R. A. Sasaki, T. Nature 422, 53 (2003).Google Scholar
6 Liu, C.J. Liao, C.Y. Huang, L.C., Su, C.H. Neeleshwar, S. Chen, Y.Y. C.Liu, J.C. Physica C 416, 43 (2004).Google Scholar
7 Liu, C.J. Hung, W.C. Wang, J.S. Liu, C.J. C. J. Amer. Chem. Soc. 127, 830 (2005).Google Scholar
8 Hicks, L. D. Dresselhaus, M. S. Phys. Rev. B47, 16631 (1993).Google Scholar
9 Liu, C.J. Nayak, P. K. Lin, Z.R. Jeng, K.Y. Thin Solid Films 516, 8564 (2008).Google Scholar
10 Motohashi, T. Naujalis, E. Ueda, R. Isawa, K. Karppinen, M. Yamauchi, H. Appl. Phys. Lett. 79, 1480 (2001).Google Scholar
11 Liu, C.J. Liao, C.Y. Lin, J.Y. and Lee, J.F. Phil. Mag., to appear in 2010.Google Scholar