Thermo-optical characterization of cadmium selenide/zinc sulfide (CdSe/ZnS) quantum dots embedded in biocompatible materials.
Cadmium selenide/zinc sulfide (CdSe/ZnS) core-shell quantum dots (QDs) embedded in biocompatible materials were thermally and optically characterized with a thermal lens (TL) technique. Transient TL measurements were performed with a mode-mismatched, dual-beam (excitation and probe) configuration. A thermo-optical study of the CdSe/ZnS QDs was performed for different core diameters (3.5, 4.0, 5.2, and 6.6 nm) in aqueous solution and synthetic saliva, and three different core diameters (2.4, 2.9, and 4.1 nm) embedded in restorative dental resin (0.025% by mass). The thermal diffusivity results are characteristic of the biocompatible matrices. The radiative quantum efficiencies for aqueous solution and biofluid materials are dependent on the core size of the CdSe/ZnS core-shell QDs. The results obtained from the fluorescence spectral measurements for the biocompatible materials support the TL results.
Instituto de Física, Universidade Federal de Uberlândia, Av. João Naves de Ávila 2121, CEP 38.400-902, Uberlândia, MG, Brazil.
Viviane
V
Pilla
Leandro P
LP
Alves
Adalberto N
AN
Iwazaki
Acácio A
AA
Andrade
Andrea
A
Antunes
Egberto
E
Munin
D001672:Biocompatible Materials / Q000737:chemistry*; D019187:Cadmium Compounds / Q000737:chemistry*; D008422:Materials Testing; D010316:Particle Size; D045663:Quantum Dots; D012117:Resins, Synthetic; D012464:Saliva, Artificial; D018036:Selenium Compounds / Q000737:chemistry*; D013050:Spectrometry, Fluorescence; D013440:Sulfides / Q000737:chemistry*; D017967:Zinc Compounds / Q000737:chemistry*
D001672:Biocompatible Materials; D019187:Cadmium Compounds; D012117:Resins, Synthetic; D012464:Saliva, Artificial; D018036:Selenium Compounds; D013440:Sulfides; D017967:Zinc Compounds; C058667:cadmium selenide; C031238:zinc sulfide