287402 Two-Step Gas Phase Synthesis of Janus-Like and Core-Shell FexOy-TiO2 Composite Nanoparticles

Thursday, November 1, 2012: 2:10 PM
Conference C (Omni )
Juha Harra1, Juha-Pekka Nikkanen2, Mikko Aromaa1, Heikki Suhonen1, Mari Honkanen2, Saara Heinonen2, Erkki Levänen2 and Jyrki M. Mäkelä1, (1)Aerosol Physics Laboratory, Tampere University of Technology, Tampere, Finland, (2)Department of Materials Science, Tampere University of Technology, Tampere, Finland

Composite nanoparticles are of a great interest because the properties of several different materials can be combined. In this study, FexOy-TiO2 nanoparticles were synthesized in two steps. Iron oxide and titanium dioxide were chosen because they are known to have magnetic and photocatalytic properties, respectively. FexOy nanoparticles were synthesized using the Liquid Flame Spray technique by feeding a solution of ferrocene dissolved in xylene into a high-temperature H2-O2 flame. The flame-made nanoparticles were collected with an electrostatic precipitator and mixed with titanium(IV) isopropoxide (TTIP) liquid. The mixture was sprayed into a tube furnace where TTIP was thermally decomposed to form TiO2. Both FexOy and FexOy-TiO2 nanopowders were characterized with TEM and XRD. The TEM images show that by altering the process parameters, the structure of the composite nanoparticles can be tailored between Janus-like and core-shell particles consisting of an agglomerated FexOy particle attached to or inside a spherical TiO2 particle, respectively. Mixing nanopowder into precursor liquid that is thermally decomposable is a versatile and easy method to synthesize composite nanopowders which are formed of particles containing two or more different materials and properties, as demonstrated in this study.

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See more of this Session: Magnetic Particle Synthesis and Properties
See more of this Group/Topical: Particle Technology Forum