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Oxidation Mechanism of Nickel Oxide/Carbon Nanotube Composite

Published online by Cambridge University Press:  06 August 2013

Tae-Hoon Kim ,
Min-Ho Park ,
Jiho Ryu  and
Cheol-Woong Yang
Tae-Hoon Kim
Affiliation:
School of Advanced Materials Science and Engineering, Sungkyunkwan University, Suwon, Gyeonggi-do 440-746, SouthKorea
Min-Ho Park
Affiliation:
School of Advanced Materials Science and Engineering, Sungkyunkwan University, Suwon, Gyeonggi-do 440-746, SouthKorea
Jiho Ryu
Affiliation:
Department of Automobile Development, Ajou Motor College, Boryeong 355-769, Korea
Cheol-Woong Yang*
Affiliation:
School of Advanced Materials Science and Engineering, Sungkyunkwan University, Suwon, Gyeonggi-do 440-746, SouthKorea
*
*Corresponding author. E-mail: cwyang@skku.edu
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Abstract

The oxidation mechanism and thermal stability of nickel oxide (NiO)/carbon nanotube (CNT) composites were investigated by examining composites with different NiO contents by thermogravimetric analysis and transmission electron microscopy (TEM). NiO acts as a catalyst in the oxidation of CNT in the composite. CNTs can be oxidized, even in a vacuum, by reducing NiO to nickel at temperatures lower than the normal oxidation temperature of CNTs. This phase transition was confirmed directly by in situ heating TEM observations. In air, reduction by CNT occurs simultaneously with reoxidation by gaseous O2 molecules, and NiO maintains its phase. The thermal stability decreased with increasing NiO content because of defects in the CNT generated by the NiO loading.

Keywords

oxidation mechanismNiOCNTcompositein situ heatingTEMTGARaman spectroscopy
Type
Research Article
Information
Microscopy and Microanalysis , Volume 19 , Supplement S5: IUMAS , August 2013 , pp. 202 - 206
Copyright
Copyright © Microscopy Society of America 2013 

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