CDSXSE1-X NANOCRYSTALS IN A SILICATE GLASS

A dilute system of CdSxSe1-x nanocrystals with low anisotropy and low size dispersion has been studied by SAXS. The presence of angularities at the surface of the nanoparticles is evidenced from the limit at ze ro of the chord distribution function. Moreover in a model of spherica l particles the size given by the average chord does not agree with th at given by the integral parameters. A cubic particle shape has been u sed to evaluation of the size distribution. This distribution agrees w ith the expected one, and allows to confirm the validity of a polyedra l model for the treatment of the SAXS data. Structural information on the particle surface can be deduced from the presence of the angularit ies.