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Laser photochemical deposition of magnetite nanograins in a-Fe/C/O composite: High-pressure metal oxide polymorph surviving ambient conditions

Paper ID Volume ID Publish Year Pages File Format Full-Text
28049 44057 2012 8 PDF Available
Title
Laser photochemical deposition of magnetite nanograins in a-Fe/C/O composite: High-pressure metal oxide polymorph surviving ambient conditions
Abstract

UV laser-induced gas-phase photolysis of Fe(CO)5 results in deposition of Fe/C/O nanocomposite film which was analyzed by Raman, Fourier transform infrared, X-ray photoelectron and laser-induced breakdown spectroscopy and electron microscopy. The nanocomposite film was revealed as an amorphous phase composed of iron oxides (FeO and Fe2O3) and carbonaceous constituents possessing CO and CO bonds. This phase contains crystalline nanograins of ambient cubic and high-pressure orthorhombic magnetite. The survival of the high-pressure Fe3O4 nanograins at ambient conditions is tentatively ascribed to their Laplace pressure and/or to stabilizing effect of the amorphous Fe/C/O phase. The o-Fe3O4 nanograins represent a very rare example of high-pressure nanosized polymorph surviving at ambient conditions and not retrieving ambient-pressure-stable phase upon decompression.

► Laser photolysis of iron pentacarbonyl for deposition of Fe/C/O nanocomposite. ► Nanocomposite incorporating high-pressure (orthorhombic) and ambient-stable (cubic) nanostructures of Fe3O4. ► The high-pressure Fe3O4 nanoform embedded in Fe/C/O phase is stable at ambient conditions.

Keywords
UV laser photolysis; Iron pentacarbonyl; Amorphous Fe/C/O composite; High-pressure Fe3O4 polymorph
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Laser photochemical deposition of magnetite nanograins in a-Fe/C/O composite: High-pressure metal oxide polymorph surviving ambient conditions
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Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 243, 1 September 2012, Pages 33–40
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us