| Full text | |
| Author(s): |
Pilla, Viviane
;
Cruz, Renato A.
;
Catunda, Tomaz
;
Munin, Egberto
;
Pacheco, Marcos. T. T.
;
Wetter, NU
;
Frejlich, J
Total Authors: 7
|
| Document type: | Journal article |
| Source: | MAGNETIC FIELDS IN THE UNIVERSE: FROM LABORATORY AND STARS TO PRIMORDIAL STRUCTURES; v. 992, p. 3-pg., 2008-01-01. |
| Abstract | |
Thermal Lens (TL) for fluorescence quantum efficiency measurements were performed in CdSe/ZnS core-shell nanoparticles embedded into the poly(methyl methacrylate) (PMMA) and suspended in tetrahydrofuran (THF), chloroform and toluene. TL transient measurements were performed using the mode-mismatched dual-beam (excitation and probe) configuration. A He-Ne laser at lambda(p) = 632.8 nm was used as theprobe beam and either an Ar+ laser (at lambda(e)=476, 488, 501 or 514.5 nm) or a He-Ne laser (at lambda(e),= 594 nm) was used as the excitation beam for solution of nanocrystal suspended in THE The value obtained for the fluorescence quantum efficiency eta was 0.68. Thermo-optical parameters as thermal diffusivity D and the refractive index temperature coefficient dn/dT were determined by TL technique in function of the lambda(e). The values for dn/dT obtained by TL technique corroborate with the results performed with refractometer measurements. (AU) | |
| FAPESP's process: | 06/01277-2 - Nonlinear spectroscopy in quantum dots functionalized for biological applications |
| Grantee: | Viviane Pilla |
| Support Opportunities: | Regular Research Grants |