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Issue 19, 2009
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Blue nano titania made in diffusion flames

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Blue titanium suboxide nanoparticles (including Magneli phases) were formed directly without any post-processing or addition of dopants by combustion of titanium-tetra-isopropoxide (TTIP) vapor at atmospheric pressure. Particle size, phase composition, rutile and anatase crystal sizes as well as the blue coloration were controlled by rapid quenching of the flame with a critical flow nozzle placed at various heights above the burner. The particles showed a broad absorption in the near-infrared region and retained their blue color upon storage in ambient atmosphere. A high concentration of paramagnetic Ti3+ centres was found in the substoichiometric particles by electron paramagnetic resonance (EPR) spectroscopy. Furthermore particles with controlled band gap energy from 3.2 to 3.6 eV were made by controlling the burner–nozzle-distance from 10 to 1 cm, respectively. The color robustness and extent of suboxidation could be further enhanced by co-oxidation of TTIP with hexamethyldisiloxane in the flame resulting in SiO2-coated titanium suboxide particles. The process is cost-effective and green while the particles produced can replace traditional blue colored, cobalt-containing pigments.

Graphical abstract: Blue nano titania made in diffusion flames

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Article information

02 Dec 2008
04 Feb 2009
First published
02 Mar 2009

Phys. Chem. Chem. Phys., 2009,11, 3742-3747
Article type

Blue nano titania made in diffusion flames

A. Teleki and S. E. Pratsinis, Phys. Chem. Chem. Phys., 2009, 11, 3742
DOI: 10.1039/B821590A

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