Synthesis and Characterisation of Hybrid Matrix Materials Containing Dispersed CdS Nanoparticles Obtained by the Sol-Gel Technique V. I. Boev, C.J. R. Silva, S. A. Filonovich, A. G. Rolo, M. I. Vasilevsky, and M. J. M. Gomes, COST Materials Action 523 – Mid Term Meeting and Workshop on “NanoMaterials, Fundamentals and Applications”, National Technology Park,Irlanda, 4-6 de Outubro de 2001