Mesoporous urchin-likeα-Fe2O3superstructures with high coercivity and excellent gas sensing properties
| Autor: | Melania Marinescu-Jasinski, Tian Li, Junfeng Liu, Baozhi Cui |
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| Rok vydání: | 2015 |
| Předmět: |
Aqueous solution
Materials science Morin transition Morphology (linguistics) Fabrication Polymers and Plastics Thermal decomposition Metals and Alloys Nanotechnology Coercivity Surfaces Coatings and Films Electronic Optical and Magnetic Materials Biomaterials Chemical engineering Nanorod Mesoporous material |
| Zdroj: | Materials Research Express. 2:045011 |
| ISSN: | 2053-1591 |
| Popis: | This paper reports the synthesis, morphology, magnetic properties and gas sensing characteristics of mesoporous urchin-like α-Fe2O3 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 α-Fe2O3 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 μm. 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, iHc, of up to 5.3 kOe and reduced Morin transition temperatures were observed for the urchin-like α-Fe2O3 superstructures. The urchin-like α-Fe2O3 samples showed excellent gas sensing performance for acetone, ammonia, and ethanol. |
| Databáze: | OpenAIRE |
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