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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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Microstructural examination of α-Fe2O3 ellipsoids. (a) Low-magnification SEM image; (b) low-magnification TEM image (insets: corresponding high-magnification).
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fig2: Microstructural examination of α-Fe2O3 ellipsoids. (a) Low-magnification SEM image; (b) low-magnification TEM image (insets: corresponding high-magnification).

Mentions: FE-SEM observations have shown that each as-prepared α-Fe2O3 particle is of collective-like morphology with nearly elliptical in shape and nanoscaled surface roughness, as illustrated in Figure 2(a) and its inset. Each hematite ellipsoid is 500 nm and 120 nm in major and short axis, respectively (seen from Figure 2(a)). Further microstructural examination conducted for such α-Fe2O3 ellipsoids was shown in Figure 2(b). It was confirmed that many α-Fe2O3 nanoparticles (~20 nm) reconstructed the porous hematite ellipsoid. The surface of every ellipsoid is also thus rough.


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

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

Microstructural examination of α-Fe2O3 ellipsoids. (a) Low-magnification SEM image; (b) low-magnification TEM image (insets: corresponding high-magnification).
© Copyright Policy - open-access
Related In: Results  -  Collection

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

fig2: Microstructural examination of α-Fe2O3 ellipsoids. (a) Low-magnification SEM image; (b) low-magnification TEM image (insets: corresponding high-magnification).
Mentions: FE-SEM observations have shown that each as-prepared α-Fe2O3 particle is of collective-like morphology with nearly elliptical in shape and nanoscaled surface roughness, as illustrated in Figure 2(a) and its inset. Each hematite ellipsoid is 500 nm and 120 nm in major and short axis, respectively (seen from Figure 2(a)). Further microstructural examination conducted for such α-Fe2O3 ellipsoids was shown in Figure 2(b). It was confirmed that many α-Fe2O3 nanoparticles (~20 nm) reconstructed the porous hematite ellipsoid. The surface of every ellipsoid is also thus rough.

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