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In this work, the polyester resins doped with semiconductor nanostructures (or quantum dots QDs) of CdSe /ZnS were prepared. The resins were obtained with three different sizes of QDs (5.1, 2.9 or 2.4 nm), and different concentrations. From these materials, two sets of resins were made, and the first set was made only for the QDs of 5.1 nm and with variable concentrations; the second set of samples was performed with quantum dots of different sizes and for the same concentration. The emission spectra of all the samples were performed at 409 nm, and their respective thermo-optical parameters were determined. The mode-mismatched Thermal Lens (TL) technique was used to obtain the thermo-optical parameters (thermal diffusivity and the parameter proportional to the TL amplitude normalized by the absorbed power θ /Pabs) using an excitation beam at 514.5 nm. Spectroscopic and thermo-optical characterizations were performed before and after the resins were irradiated with X-rays using a linear high-voltage accelerator with 5 different dosages (2, 4, 6, 8 and 10 Gy). The optical properties of the resins doped with CdSe/ZnS QDs were compared before and after X-ray irradiation, in order to determine the potential of the QDs to detect the presence of X-rays, aiming at a possible dosimeter application.

Caracterização termo-óptica de resinas dopadas com nanocristais semicondutores: efeitos de incidência de radiação ionizante