A Metastable Ion (III) Oxide Phase (ε-Fe2O3): Preparation and Gas Sensing Properties

Ming Jing Wang; Hui Ming Ji; Ya Lu Chen; Qian Qian Jia

doi:10.4028/www.scientific.net/KEM.697.737

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A Metastable Ion (III) Oxide Phase (ε-Fe₂O₃): Preparation and Gas Sensing Properties
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HomeKey Engineering MaterialsKey Engineering Materials Vol. 697A Metastable Ion (III) Oxide Phase (ε-Fe2O3):...

A Metastable Ion (III) Oxide Phase (ε-Fe₂O₃): Preparation and Gas Sensing Properties

Abstract:

ε-Fe₂O₃ is a rare and metastable iron (III) oxide phase. ε-Fe₂O₃/SiO₂ composites were prepared by combining the reverse-micelle and sol-gel methods. An appropriate amount of Ba²⁺ was needed in this system to promote the formation of ε-Fe₂O₃ nanorods in SiO_2. The size of nanorods varied with different Ba²⁺ addition amount and sintering procedure. Then pure ε-Fe₂O₃ nanorods were obtained after stripping SiO₂ by etching due to NaOH aqueous solution. The as-synthesized ε-Fe₂O₃ nanorods were discussed using X-ray diffraction (XRD), scanning electron microscope (SEM) and transmission electron microscopy (TEM). Interestingly, metastable ε-Fe₂O₃ nanorods showed a promising performance for the response for ethanol, compared with the stable phases of α-Fe₂O₃ and γ-Fe₂O₃. It indicates that nanostructure ε-Fe₂O₃ (including ε-Fe₂O₃ nanorods) could be a valuable material for the fabrication of advanced sensing devices.

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Periodical:

Key Engineering Materials (Volume 697)

Pages:

737-740

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.697.737

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Online since:

July 2016

Authors:

Ming Jing Wang, Hui Ming Ji*, Ya Lu Chen, Qian Qian Jia

Keywords:

Nanorod, Reverse-Micelle, Sensing Properties, Sol-Gel Method, ε-Fe₂O₃

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