SYNTHESIS OF SiC NANOPARTICLES AND OPTICAL PROPERTIES
N. Herlin-Boime¹, J. Vicens2, J. Bouclé1+3, F.Ténégal1, A. Kassiba³
1) Service des Photons, Atomes et Molécules, Laboratoire Francis
Perrin (CEA-CNRS URA2453), DSM - CEA-Saclay, Bt 522, 91191 F
Gif/Yvette Cedex, 2) LERMAT, FRE CNRS 2149, ISMRA 6, boulevard
Maréchal Juin, 14050 Caen Cedex, France,3) Laboratoire de Physique de
l'Etat Condensé - UMR-CNRS N6087, Faculté des Sciences - Université
du Maine Avenue O.Messiaen 72085 Le Mans Cedex 09 -France
SiC nanopowders were obtained in a flow reactor by the CO[2] laser
pyrolysis method from a gaseous mixture. Molecules are dissociated
after absorption of the laser radiation and collisional energy
transfer. Nucleation of nanoparticles occurs in a flame. The flame
temperature is fixed by the laser power. In this presentation, the
effect of laser power between 200 and 750 W (850-1100C) is discussed.
TEM observations have revealed that whatever the temperature, the
powders are composed of grains of about 10 nm diameter, these grains
are amorphous at low temperature and contain an increasing number of
nanocrystals (2 nm diameter) when the temperature increases.
The desagglomeration and dispersion of the SiC nanoparticles was
studied in different liquids in order to optimise their repartition
when embedded in a polymer matrix. The optical properties of these
composite materials (nanoparticles/matrix) were studied. An
enhancement of the linear electrooptical effect was measured. This
effect is mainly attributed to interface effects between the polymer
matrix and the surface of the particles.

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