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Structural Stability of Iron Oxide Nanotubes and an Enhancement of Photo Induced Current Detected in the Complex with Fullerenols

Published online by Cambridge University Press:  04 February 2014

Shunji Bandow  and
Yuki Shiraki
Shunji Bandow
Affiliation:
Department of Applied Chemistry, Meijo University, 1-501 Shiogamaguchi, Tenpaku, Nagoya 468-8502, Japan
Yuki Shiraki
Affiliation:
Department of Applied Chemistry, Meijo University, 1-501 Shiogamaguchi, Tenpaku, Nagoya 468-8502, Japan
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Abstract

Iron oxide nanotubes (Fe-ox-NTs) were prepared by a sol-gel technique using a mixture of an Fe(NO3)3·9H2O and a Pluronic F-127 nonionic surfactant in 1-propanol, gelatinizing at 35 °C for 5 days. Crude nanotubes thus obtained were well rinsed by deionized water in order to remove the surfactant. Transmission electron microscopy showed that the products have tubule structure with the outer (inner) diameter ∼10-15 (∼5-10) nm and the length ∼100 nm. X-ray diffraction profile of the crude nanotubes indicated a broadened feature characteristic for a defective or amorphous-like material, and whose profile may associate with the structure of ɣ-Fe2O3 (maghemite). By heating the crude nanotubes in open air, a phase transition occurs in a defective ɣ-Fe2O3 and its structure changes to a relaxed α-Fe2O3 (hematite) without morphological transformation. A further increase of the temperature results a destruction of the tube structure to the spherical nanoparticles without changing the crystallographic structure. A structurally relaxed Fe-ox-NT complex with fullerenols (C60(OH)n, n∼20) has larger photosensitive response under visible light irradiation, but the crude and defective Fe-ox-NTs and their complexes with fullerenols do not indicate noticeable response.

Keywords

phase transformationnanostructurephotoconductivity
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1659: Symposium SS/XX – Micro- and Nanoscale Systems – Novel Materials, Structures and Devices , 2014 , pp. 169 - 174
Copyright
Copyright © Materials Research Society 2014 

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References

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