8 October 2004 Carbon-encapsulated iron nanoparticles prepared by laser pyrolysis: characterization and catalyzers for carbon nanotubes and nanofibers
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Abstract
The embedding of Fe-based nanoparticles in carbon layers allows novel physical and catalyzing properties due to inertness and resistance to external detrimental conditions. We have prepared almost spherical carbon encapsulated iron nanoparticles with narrow size distribution, via laser co-pyrolysis method in which the CW CO2 laser beam irradiates a gas mixture containing iron pentacarbonyl (vapors) and ethylene/acetylene hydrocarbons. Specific flow geometries were used in order to synthesize iron particle first followed by stimulate hydrocarbon decomposition at iron surfaces. High-resolution transmission electron microscopy images reveal the core-shell feature of synthesized nanostructures with around 2 nm thick carbon layers and 3-7 nm diameters iron-based core dimensions. The mean diameter could be experimentally controlled. It was found a decreasing trend of particle size with the decreasing of pressure and total reactant gas flow. EELS, EDAX and Raman spectroscopy analysis confirm the simultaneous presence of carbon and iron. The nanoparticles were seeded onto Si wafer and further used as substrates for laser induced CVD carbon nanotubes growth. Depending on laser power density, nanotubes or nanofibres are formed, in strong dependence with the location of iron based nanoparticles on Si substrates as revealed by SEM analysis.
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Florian V. Dumitrache, Victor Ciupina, Ion Morjan, Rodica Alexandrescu, Ion Voicu, Iuliana Soare, Lavinia Albu, Raluca Morjan, Gabi Prodan, "Carbon-encapsulated iron nanoparticles prepared by laser pyrolysis: characterization and catalyzers for carbon nanotubes and nanofibers", Proc. SPIE 5515, Nanoengineering: Fabrication, Properties, Optics, and Devices, (8 October 2004); doi: 10.1117/12.561332; https://doi.org/10.1117/12.561332
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