Journal
EUROPEAN JOURNAL OF INORGANIC CHEMISTRY
Volume -, Issue 25, Pages 4076-4081Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/ejic.201200140
Keywords
Solid-state structures; Nanoparticles; Magnetic properties; Sensors
Categories
Funding
- National Natural Science Foundation of China [21003147]
- Natural Science Foundation of Shanxi [2011011007-3]
- Institute of Coal Chemistry, Chinese Academy of Sciences [2011SJCRC07]
- State Key Laboratory of Coal Conversion (SKLCC) [2011BWZ005]
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Octadecahedral alpha-Fe2O3 nanoparticles were hydrothermally synthesized in the presence of formamide. These octadecahedral alpha-Fe2O3 nanoparticles have a threefold axis and are enclosed by twelve dominant {112} facets and six {104} facets. In comparison with the {104} facets, the sterically less hindered {112} facets induced the selective adsorption of formamide more easily, which resulted in the gradual increase in the amount of {112} facets by decreasing the amount of {104} facets with increasing formamide. The coercivity (Hc) of these octadecahedral particles increased successively as the aspect ratio (c/a) increased. The sensing capability of these particles toward H2O2 was investigated, and the response currents of the particles dominated by {112} facets showed a linear relationship with a concentration of H2O2 in the range from 40 mu M to 6.66 mM in different stages.
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