Mesoporous urchin-like alpha -Fe sub(2) O sub(3) superstructures with high coercivity and excellent gas sensing properties

This paper reports the synthesis, morphology, magnetic properties and gas sensing characteristics of mesoporous urchin-like alpha -Fe sub(2) O sub(3) superstructures prepared by one-step thermal decomposition of iron nitrate aqueous solution. The advantages of this fabrication technique include simp...

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Bibliographic Details
Published in:Materials research express 2015-04, Vol.2 (4)
Main Authors: Cui, Baozhi, Li, Tian, Liu, Junfeng, Marinescu-Jasinski, Melania
Format: Article
Language:English
Subjects:
Coercive force
Coercivity
Gas sensors
Morphology
Nanorods
Nanostructure
Single crystals
Superstructures
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Summary:This paper reports the synthesis, morphology, magnetic properties and gas sensing characteristics of mesoporous urchin-like alpha -Fe sub(2) O sub(3) superstructures prepared by one-step thermal decomposition of iron nitrate aqueous solution. The advantages of this fabrication technique include simplicity, convenience, efficiency, capability of scale-up fabrication, and good control of product structure and morphology. The urchin-like alpha -Fe sub(2) O sub(3) superstructures are made of oriented aggregations of nanorods (diameter ~ 10-130 nm; length ~ 150-700 nm) with an overall size in the range of 0.5-5 mu m. The nanobuilding blocks of the urchin-like superstructures are either single-crystal nanorods or a mixture of single-crystal knotted or branched sub-nanorods and elongated particles. Unusually high intrinsic coercivity, sub(i) H sub(c), of up to 5.3 kOe and reduced Morin transition temperatures were observed for the urchin-like alpha -Fe sub(2) O sub(3) superstructures. The urchin-like alpha -Fe sub(2) O sub(3) samples showed excellent gas sensing performance for acetone, ammonia, and ethanol.
ISSN:2053-1591
2053-1591
DOI:10.1088/2053-1591/2/4/045011