Open AccessJournal Article
X-ray Diffraction and UV-Visible Characterizations of α-Fe 2 O 3 Nanoparticles Annealed at Different Temperature
P. Mallick,B. N. Dash +1 more
TLDR
In this paper, the effect of annealing on the microstructure, optical absorption properties of hematite (α -Fe2O3) nanoparticles was studied.Abstract:
Effect of annealing on the microstructure, optical absorption properties of hematite (α -Fe2O3) nanoparticles were studied. Crystallite size of α -Fe2O3 increased fro m ~ 34 to 44 n m with increasing annealing temperature fro m 500 to 700℃. St rain in the sample decreased with increasing annealing temperature. UV-visib le characterizat ion indicated the existence of both direct and indirect band gap in the samples. The samp les annealed at all temperatures showed the direct band gap at ~ 2.67 eV. However, the indirect band gap increased from 1.6 to 1.94 eV when the annealing temperature increased fro m 500 to 600℃ and remained almost same for sample annealed at 700℃. The observed values of optical band gaps were in close agreement with the reported values. Ou r results indicated that the thermal annealing would g ive rise to well crystalline α -Fe2O3 nanoparticles with reduced strain.read more
Citations
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Synthesis of Magnetic Ferrite Nanoparticles with High Hyperthermia Performance via a Controlled Co-Precipitation Method.
TL;DR: The modified method, which allows for precursor material compositions (molar ratio of Fe+3:Fe+2:Co+2/Zn+2 of 3:2:1), is a simple, environmentally friendly, and low temperature process carried out in air at a maximum temperature of 60 °C, without the need for oxidizing or coating agents.
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Chitosan-iron oxide nanocomposite based electrochemical aptasensor for determination of malathion
TL;DR: An electrochemical aptasensor based on chitosan-iron oxide nanocomposite (CHIT-IO) film deposited on fluorine tin Oxide (FTO) was developed for the detection of malathion and exhibited LOD of about 0.001 ng/mL within 15 min and spike-in studies revealed about 80-92% recovery ofmalathion from the lettuce leaves and soil sample.
Journal ArticleDOI
High rates of Cr(VI) photoreduction with magnetically recoverable nano-Fe3O4@Fe2O3/Al2O3 catalyst under visible light
TL;DR: In this paper, a core-shell type Fe 3 O 4 @Fe 2 O 3 was dispersed over nano Al 2O 3 support using aqueous medium co-precipitation method.
Journal ArticleDOI
Synthesis and application of novel α-Fe2O3/graphene for visible-light enhanced photocatalytic degradation of RhB
Sana Frindy,Mika Sillanpää +1 more
TL;DR: In this article, the existence of N and S heteroatoms on the surface of the graphene affects the size of nanoparticles and the specific surface area in the α-Fe2O3-Gr, with a negative effect on catalytic performance.
Journal ArticleDOI
Structural and optical properties of sol-gel derived α-Fe 2 O 3 nanoparticles
TL;DR: In this paper, a simple sol-gel method using iron (III) nitrate nonahydrate (Fe(NO 3 ) 3 ·9H 2 O) as a precursor was used to synthesize α-Fe 2 O 3 nanoparticles of crystallite size between 3.9 and 9.5 µm.
References
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Electronic processes in non-crystalline materials
TL;DR: The Fermi Glass and the Anderson Transition as discussed by the authorsermi glass and Anderson transition have been studied in the context of non-crystalline Semiconductors, such as tetrahedrally-bonded semiconductors.