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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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XRD patterns of samples under different pressures ((a) 1.02 × 105 Pa (b) 1.15 × 105 Pa (c) 1.62 × 105 Pa).
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fig3: XRD patterns of samples under different pressures ((a) 1.02 × 105 Pa (b) 1.15 × 105 Pa (c) 1.62 × 105 Pa).

Mentions: In general, the values of pressure in reaction systems will determine the chemical reaction start at the same reaction temperature. So different composition products can be gained under different values of pressures. Our deep and systematic studies have revealed that pure goethite (α-FeOOH) nanorods (seen from Figures 3(a) and 4(a)) will be obtained when the value of reactive pressure is less than 1.02 × 105 Pa. And the mixture of α-FeOOH nanorods and α-Fe2O3 ellipsoids will be acquired when the value of pressure is between 1.15 × 105 Pa and 1.45 × 105 Pa, as shown in Figures 3(b) and 4(b), respectively.


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

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

XRD patterns of samples under different pressures ((a) 1.02 × 105 Pa (b) 1.15 × 105 Pa (c) 1.62 × 105 Pa).
© Copyright Policy - open-access
Related In: Results  -  Collection

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

fig3: XRD patterns of samples under different pressures ((a) 1.02 × 105 Pa (b) 1.15 × 105 Pa (c) 1.62 × 105 Pa).
Mentions: In general, the values of pressure in reaction systems will determine the chemical reaction start at the same reaction temperature. So different composition products can be gained under different values of pressures. Our deep and systematic studies have revealed that pure goethite (α-FeOOH) nanorods (seen from Figures 3(a) and 4(a)) will be obtained when the value of reactive pressure is less than 1.02 × 105 Pa. And the mixture of α-FeOOH nanorods and α-Fe2O3 ellipsoids will be acquired when the value of pressure is between 1.15 × 105 Pa and 1.45 × 105 Pa, as shown in Figures 3(b) and 4(b), respectively.

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