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Shape Control in Iron Oxide Nanocrystal Synthesis, Induced by Trioctylammonium Ions
journal contribution
posted on 2009-04-14, 00:00 authored by Alexey Shavel, Benito Rodríguez-González, Jessica Pacifico, Marina Spasova, Michael Farle, Luis M. Liz-MarzánFaceted iron oxide nanoparticles with octahedral shape were synthesized through controlled modification of the iron oleate decomposition method. The key to this novel shape control is the “in situ” formation of trioctylammonium bromide (TOAHB) during the process, through decomposition of quaternary ammonium salts. This hypothesis was confirmed by carrying out the synthesis in the presence of preformed TOAHB, which again resulted in the formation of iron oxide octahedra. A detailed high-resolution transmission electron microscopy (HRTEM) analysis of the nanooctahedra was performed for shape analysis and structural characterization. X-ray photoelectron spectroscopy (XPS) indicates the presence of both metallic iron and iron oxide within the nanooctahedra. The results obtained by HRTEM and XPS are in agreement with magnetic analysis, which revealed the presence of several magnetic phases in the samples.
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presencetrioctylammonium bromidequaternary ammonium saltsXPSpreformed TOAHBnanooctahedrairon oleate decomposition methodIron Oxide Nanocrystal Synthesisshape analysisshape Controlformationoctahedral shapeHRTEMtransmission electron microscopynovel shape controliron oxide octahedraTrioctylammonium IonsFaceted iron oxide nanoparticlesiron oxide
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