Nanomaterials have applications in various fields such as microelectronics, electromagnetism, optoelectronic and chemistry (biomedical, pharmaceutical, cosmetics...). In particular, pure TiO₂ nanoparticles have different properties according to their structure. For example, crystallisation in the anatase form favours photocatalytic activity as compared to the rutile organisation. Doped TiO₂ nanoparticles are also very useful for various catalytic reactions. Moreover, incorporation of heteroatoms may favour photocatalytic activity and absorption of solar light.

Different methods such as sol-gel chemistry and flame spray pyrolysis are often used for the synthesis of TiO₂ nanoparticles. At laboratory scale, the TiO₂ anatase form and various doped TiO₂ nanoparticles have been obtained by these methods. Laser pyrolysis offers some similarities with flame spray pyrolysis and the continuous production makes this method interesting in terms of larger production. It is based on the interaction of a powerful IR laser beam with a mixture of gaseous or liquid precursors, with one of them absorbing the laser radiation. It has been developed up to now mainly for the production of non-oxide nanoparticles (Si, SiC, Si₃N₄...).

Pure and doped TiO₂ powders have now been synthesised from laser pyrolysis, using a spray of TTIP (Titanium tetra isopropoxide) as main precursor. The as–grown powders most often contain an amount of carbon which can be easily eliminated by annealing at low temperature under air. All the crystalline phase which can be identified in the powders can be attributed to the various phases of TiO₂. This paper shows the possibility to produce in one step nanoparticles in the anatase or in the rutile form or in a mixture between the two phases by tuning the experimental parameters such as the laser power. First results illustrating the consequences of this structural evolution on the properties of nanoparticles will also be presented.

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