Synthesis of SiCNYO nanopowders by spray pyrolysis

SiCNYO nanopowders have been elaborated by a spray pyrolysis method from an organometallic precursor which is synthesized by two different routes. Fourier-transform infrared spectroscopy and solid state nuclear magnetic resonance were used to identify the silylation and the amminolysis mechanism applied for the synthesis of each precursor. The SEM micrographs of the each “as-pyrolysed” product revealed spherical SiCNYO nanopowders with a bimodal size distribution. A drop-to-particle and a gas to particle exchanges seem to be the two mechanisms at the origin of grains size distribution. The nature and the reactivity of the carrier gas used in the aerosol indicate a significant influence on the powder morphology. It was found also that evaporation rate of the as-prepared precursor may lead to prevent the enlarging of particles.

Graphical AbstractSiCNYO nanopowders were synthesized by the spray-pyrolysis procedure. The obtained materials possess a bimodal grain-size distribution which seems to be influenced by the reactivity of the gas carrier. Drop-to-particle and gas-to-particle mechanisms observed between the aerosol and the gas carrier were analysed.Figure optionsDownload as PowerPoint slide