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Synthesis and growth of hematite nanodiscs through a facile hydrothermal approach
journal contribution
posted on 2010-03-01, 00:00 authored by X Jiang, A Yu, Wenrong YangWenrong Yang, Y Ding, C Xu, S LamThis study reports a facile hydrothermal method for the synthesis of monodispersed hematite (α-Fe2O3) nanodiscs under mild conditions. The method has features such as no use of surfactants, no toxic precursors, and no requirements of high-temperature decomposition of iron precursors in non-polar solvents. By this method, α-Fe2O3 nanodiscs were achieved with diameter of 50 ± 10 nm and thickness of ~6.5 nm by the hydrolysis of ferric chloride. The particle characteristics (e.g., shape, size, and distribution) and functional properties (e.g., magnetic and catalytic properties) were investigated by various advanced techniques, including TEM, AFM, XRD, BET, and SQUID. Such nanodiscs were proved to show unique magnetic properties, i.e., superparamagnetic property at a low temperature (e.g., 20 K) but ferromagnetic property at a room temperature (~300 K). They also exhibit low-temperature (<623 K) catalytic activity in CO oxidation because of extremely clean surfaces due to non-involvement of surfactants, compared with those spheres and ellipsoids capped by PVP molecules.
History
Journal
Journal of nanoparticle researchVolume
12Issue
3Pagination
877 - 893Publisher
SpringerLocation
Dordrecht , The NetherlandsPublisher DOI
ISSN
1388-0764eISSN
1572-896XLanguage
engPublication classification
C1.1 Refereed article in a scholarly journalCopyright notice
2010, SpringerUsage metrics
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No categories selectedKeywords
hematite nanoparticlesnanodiscshydrothermal synthesisScience & TechnologyPhysical SciencesTechnologyChemistry, MultidisciplinaryNanoscience & NanotechnologyMaterials Science, MultidisciplinaryChemistryScience & Technology - Other TopicsMaterials ScienceOXIDE BASED AEROGELSMAGNETIC-PROPERTIESALPHA-FE2O3OXIDATIONSIZECRYSTALLINETEMPERATUREHYDROLYSISMECHANISMEVOLUTION
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