Effects of some synthesis parameters on the structure of titania nanoparticles obtained by laser pyrolysis

Effect of Gas Flow Rates on the Anatase–Rutile Transformation Temperature of Nanocrystalline TiO2 Synthesised by Chemical Vapour Synthesis

“…It is likely that the presence of this combined carbon attached to TiO 2 delayed the transformation of anatase to rutile. It has been reported earlier 25 that during the synthesis of titania particles by CO 2 laser decomposition, increase in the oxygen flow rate resulted in an initial increase in the rutile content followed by a decrease. This was conjectured without much experimental support to be a result of carbon contamination in the titania structure leading to the stabilization of the anatase phase.…”

Development of the IR laser pyrolysis for the synthesis of iron–doped TiO2 nanoparticles: Structural properties and photoactivity

“…The chemical reaction is triggered by the heating of precursors through collisional energy transfer. The synthesis of Fe-doped TiO 2 nanopowders was performed by employing a modified version of the pyrolysis set-up [16] in which TiCl 4 , Fe(CO) 5 and air, as gas phase precursors are simultaneously allowed to emerge into the flow reactor where they are orthogonally crossed by the laser beam (400 W nominal power, k = 10.6 lm). Since the reactants (TiCl 4 and Fe(CO) 5 ) do not possess IR absorption bands at the CO 2 laser radiation, ethylene served as an energy transfer agent and as carrier for the TiCl 4 vapor precursor.…”

“…In our previous studies [15,16] we have reported on the synthesis of anatase/rutile mixed nanopowders using the laser pyrolysis as a single-step reaction route. Sensitized mixtures containing TiCl 4 (vapor) and air as gas -phase precursors were used.…”

Continuous production of iron-based nanocrystals by laser pyrolysis. Effect of operating variables on size, composition and magnetic response

“…The low dependence of particle size on reaction temperature has also been observed by other authors in the synthesis of SiC Bubbler TREG Individual nanoparticles 2.5 nm stabilized in TREG solution [25] a Refers to the way in which the organometallic vapor precursors are fed, which could be either by passing a stream through a bubbler containing pure FeCO )] and the data provided by the authors, assuming saturation. and TiO 2 by laser pyrolysis [3,32]. This may stem from several temperature-related effects.…”

“…Another major effect of temperature relates to the crystallinity and composition of the nanoparticles prepared [3,12,32]. As the temperature increases, the SF 6 sensitizer may dissociate to an increasing extent (releasing fluorine and sulfur) and also react with other species in the reactant stream.…”