J. Phys. IV France
Volume 125, June 2005
Page(s) 273 - 276

J. Phys. IV France 125 (2005) 273-276

DOI: 10.1051/jp4:2005125065

Thermal diffusivity and photoacoustic spectroscopy measurements in CdTe quantum dots borosilicate glasses

V.L. da Silva, R.C. Mesquita, E.C. da Silva, A.M. Mansanares and L.C. Barbosa

Instituto de Física "Gleb Wataghin", Universidade Estadual de Campinas, Unicamp, CP 6165, 13083-970 Campinas, São Paulo, Brazil

In this paper we describe the results of photoacoustic spectroscopy and thermal diffusivity measurements in borosilicate glass matrix with CdTe quantum dots. Samples treated at the temperature of 540°C for different periods were studied. The photoacoustic spectra show the absorption band of CdTe quantum dots, which shifts as a function of the thermal treatment time, revealing the evolution of the average radius of the nanocrystals. Thermal lens measurements provide the thermal diffusivity of the treated samples and give the behavior of the temperature coefficient of the refractive index, dn/dT, which is correlated to the transmittance spectra.

© EDP Sciences 2005