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Wet chemical controllable synthesis of hematite ellipsoids with structurally enhanced visible light property.

Han C, Han J, Li Q, Xie J - ScientificWorldJournal (2013)

Bottom Line: The results showed that the product was mesoporous α -Fe2O3 and nearly elliptical in shape.Each hematite ellipsoid was packed by many α -Fe2O3 nanoparticles.The formation of these porous hematite ellipsoids could be attributed to the vapor pressure induced oriented assembling of lots of α -Fe2O3 nanoparticles.

View Article: PubMed Central - PubMed

Affiliation: Department of Chemical and Material Engineering, Hefei University, Hefei 230601, China ; Institute of Solid State Physics, Chinese Academy of Sciences, Hefei 230031, China.

ABSTRACT
A facile and economic route has been presented for mass production of micro/nanostructured hematite microcrystals based on the wet chemical controllable method. The as-prepared samples were characterized using X-ray diffraction, scanning electron microscopy, transmission electron microscopy, and UV-Vis absorption spectroscopy. The results showed that the product was mesoporous α -Fe2O3 and nearly elliptical in shape. Each hematite ellipsoid was packed by many α -Fe2O3 nanoparticles. The values of vapor pressure in reaction systems played vital roles in the formation of porous hematite ellipsoids. Optical tests demonstrated that the micro/nanostructured elliptical hematite exhibited enhanced visible light property at room temperature. The formation of these porous hematite ellipsoids could be attributed to the vapor pressure induced oriented assembling of lots of α -Fe2O3 nanoparticles.

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UV-Vis spectrums of α-Fe2O3 from various pressures: (a) 1.62 × 105 Pa; (b) 1.45 × 105 Pa.
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fig6: UV-Vis spectrums of α-Fe2O3 from various pressures: (a) 1.62 × 105 Pa; (b) 1.45 × 105 Pa.

Mentions: Figure 6(a) shows the optical absorption spectrum of the quasicubic α-Fe2O3 nanostructures, and the optical absorption feature was observed at wavelength around 390 nm (3.18 eV) and had an inflection and shift to the short wavelength compared to that reported by Li et al. [17]. Figure 6(b) shows the optical absorption spectrum of the ellipsoid-like micro/nanostructured α-Fe2O3, and the absorption peak is about 590 nm (2.10 eV). The different optical adsorption properties of two different shaped α-Fe2O3 can be attributed to their different structures. In a word, the as-obtained porous α-Fe2O3 ellipsoids were extended for potential application in photodegradating pollutants under visible light. The relative studies are our next work.


Wet chemical controllable synthesis of hematite ellipsoids with structurally enhanced visible light property.

Han C, Han J, Li Q, Xie J - ScientificWorldJournal (2013)

UV-Vis spectrums of α-Fe2O3 from various pressures: (a) 1.62 × 105 Pa; (b) 1.45 × 105 Pa.
© Copyright Policy - open-access
Related In: Results  -  Collection

Show All Figures
getmorefigures.php?uid=PMC3814095&req=5

fig6: UV-Vis spectrums of α-Fe2O3 from various pressures: (a) 1.62 × 105 Pa; (b) 1.45 × 105 Pa.
Mentions: Figure 6(a) shows the optical absorption spectrum of the quasicubic α-Fe2O3 nanostructures, and the optical absorption feature was observed at wavelength around 390 nm (3.18 eV) and had an inflection and shift to the short wavelength compared to that reported by Li et al. [17]. Figure 6(b) shows the optical absorption spectrum of the ellipsoid-like micro/nanostructured α-Fe2O3, and the absorption peak is about 590 nm (2.10 eV). The different optical adsorption properties of two different shaped α-Fe2O3 can be attributed to their different structures. In a word, the as-obtained porous α-Fe2O3 ellipsoids were extended for potential application in photodegradating pollutants under visible light. The relative studies are our next work.

Bottom Line: The results showed that the product was mesoporous α -Fe2O3 and nearly elliptical in shape.Each hematite ellipsoid was packed by many α -Fe2O3 nanoparticles.The formation of these porous hematite ellipsoids could be attributed to the vapor pressure induced oriented assembling of lots of α -Fe2O3 nanoparticles.

View Article: PubMed Central - PubMed

Affiliation: Department of Chemical and Material Engineering, Hefei University, Hefei 230601, China ; Institute of Solid State Physics, Chinese Academy of Sciences, Hefei 230031, China.

ABSTRACT
A facile and economic route has been presented for mass production of micro/nanostructured hematite microcrystals based on the wet chemical controllable method. The as-prepared samples were characterized using X-ray diffraction, scanning electron microscopy, transmission electron microscopy, and UV-Vis absorption spectroscopy. The results showed that the product was mesoporous α -Fe2O3 and nearly elliptical in shape. Each hematite ellipsoid was packed by many α -Fe2O3 nanoparticles. The values of vapor pressure in reaction systems played vital roles in the formation of porous hematite ellipsoids. Optical tests demonstrated that the micro/nanostructured elliptical hematite exhibited enhanced visible light property at room temperature. The formation of these porous hematite ellipsoids could be attributed to the vapor pressure induced oriented assembling of lots of α -Fe2O3 nanoparticles.

Show MeSH