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Vertically Aligned Mn-doped Fe3O4 Nanowire Arrays: Magnetic Properties and Gas Sensing at Room Temperature

Published online by Cambridge University Press:  26 February 2011

Seon Oh Hwang ,
Chang Hyun Kim ,
Yoon Myung ,
Seong-Hun Park ,
Jeunghee Park ,
Chang Soo Hahn  and
Jae-Young Kim
Seon Oh Hwang
Affiliation:
nanolab@empas.com, Korea University, Department of Materials Chemistry, Jochiwon, 339-700, Korea, Republic of
Chang Hyun Kim
Affiliation:
nanolab@empas.com, Korea University, Department of Materials Chemistry, Jochiwon, 339-700, Korea, Republic of
Yoon Myung
Affiliation:
qoouni@korea.ac.kr, Korea University, Department of Materials Chemistry, Jochiwon, 339-700, Korea, Republic of
Seong-Hun Park
Affiliation:
nanolab@empas.com, Korea University, Department of Materials Chemistry, Jochiwon, 339-700, Korea, Republic of
Jeunghee Park
Affiliation:
parkjh@korea.ac.kr, Korea University, Department of Materials Chemistry, Jochiwon, 339-700, Korea, Republic of
Chang Soo Hahn
Affiliation:
nanolab@empas.com, Korea Institute of Machinery and Materials, Nano-Mechanical Systems Research Center, Daejeon, 305-343, Korea, Republic of
Jae-Young Kim
Affiliation:
nanolab@empas.com, POSTECH, Pohang Accelerator Laboratory, Pohang, 790 - 784, Korea, Republic of
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Abstract

Vertically-aligned Mn (10%)-doped Fe3O4 (Fe2.7Mn0.3O4) nanowire arrays were produced by the reduction/substitution of pre-grown Fe2O3 nanowires. These nanowires were ferromagnetic with a Verwey temperature of 129 K. X-ray magnetic circular dichroism measurements revealed that the Mn2+ ions preferentially occupy the tetrahedral sites, substituting for the Fe3+ ions. We observed that the Mn substitution decreases the magnetization, but increases the electrical conductivity. We developed highly sensitive gas sensors using these nanowire arrays, operating at room temperature, whose sensitivity showed a correlation with their bond strength of diatomic/triatomic molecules. Based on the fact that the sensitivity was highest toward water vapor, an excellent-performance humidity sensor was fabricated.

Keywords

nanostructuresensormagnetic properties
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1032: Symposium I – Nanoscale Magnetic Materials and Applications , 2007 , 1032-I14-40
Copyright
Copyright © Materials Research Society 2008

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