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Size and structure of nanoparticles formed via ultraviolet photolysis of ferrocene
Stockholm University, Faculty of Science, Department of Applied Environmental Science (ITM).
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2007 (English)In: Journal of Applied Physics, ISSN 0021-8979, E-ISSN 1089-7550, Vol. 101, no 3, 34311- p.Article in journal (Refereed) Published
Abstract [en]

Iron nanoparticles enclosed in carbon shells were formed by laser-assisted chemical vapor decomposition of ferrocene (Fe(C5H5)(2)) vapor in Ar gas atmosphere. The particle size dependence on the total ambient gas pressure and on laser fluence of the pulsed ArF excimer laser was examined and, e.g., an effective size decrease of the iron core was observed at elevated laser fluences. Characterizations of the iron and carbon microstructures were performed by x-ray diffraction and transmission electron microscopy, while relative iron deposition rates were measured by x-ray fluorescence spectroscopy. Both alpha-Fe and gamma-Fe phases were found for the single crystalline iron cores, surrounded by graphitic (inner) and amorphous (outer) carbon layers. The temperature rise of the laser-excited particles was also determined by optical spectroscopy of the emitted thermal radiation, which allowed an estimation of the iron loss of the nanoparticles due to evaporation. The estimated and measured iron losses are in good agreement. 

Place, publisher, year, edition, pages
2007. Vol. 101, no 3, 34311- p.
Keyword [en]
emission-spectroscopy, magnetic-properties, laser, graphite, fe, co, decomposition, distributions, dissociation. particles
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:su:diva-57114DOI: 10.1063/1.2432406ISI: 000244250100133OAI: oai:DiVA.org:su-57114DiVA: diva2:415867
Note
authorCount :5Available from: 2011-05-09 Created: 2011-05-03 Last updated: 2011-05-09Bibliographically approved

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