Thermal-lens study of thermo-optical properties of CdSe/ZnS quantum dots embedded into PMMA matrix

Autor(es)

Pilla, Viviane ; Munin, Egberto ; Alves, Leandro P. ; Pacheco, Marcos T. T. ; Eyink, KG ; Huffaker, DL ; Szmuloqicz, F

• Tipo de documento: Artigo Científico
• Fonte: MEDICAL IMAGING 2007: PACS AND IMAGING INFORMATICS; v. 6481, p. 8-pg., 2007-01-01.

Resumo

Thermal Lens (TL) and spectroscopic characterizations were performed in CdSe/ZnS core-shell nanoparticles embedded into the underlying polymethyl methacrylate (PMMA) dissolved in chloroform (CHCl3). TL measurements were accomplished injunction of the CdSe/ZnS quantum-dot concentration (12-60 mg/ml). The average value obtained for the thermal diffusivity was (0.85 +/- 0.02) x 10(-3) cm(2)/S. The absolute nonradiative quantum efficiency phi and the fluorescence quantum efficiency eta were determined by the TL method Higher values of phi were obtained with the increase of the core-shell nanoparticles concentrations in PMMA-chloroform solutions. These results are in agreement with the behavior of fluorescence spectra that decrease with CdSe/ZnS concentration increase. (AU)

• Processo FAPESP: 06/01277-2 - Espectroscopia não linear em nanocristais semicondutores funcionalizados para aplicações
• Beneficiário: Viviane Pilla
• Modalidade de apoio: Auxílio à Pesquisa - Regular