The concentration dependence of optical, thermophysical
and electrical behavior, based on poly-methyl
methacrylate filled with CdSe quantum dots (PMMA
(CdSe)) have been investigated. The PMMA(CdSe) concentration
was 0.001, 0.005, 0.01 and 0.05 wt.%. The composites
were prepared in the form of films by the solution
casting technique. The optical properties of PMMA(CdSe)
films have showed that, there is a red shift of the absorption
and photoluminescence (PL) after the QDs were added into
PMMA. The PL peak intensity of the composite was enhanced
by ≈ 2.5 times compared to the CdSe QDs. The
thermal conductivity (k) was obtained by measuring the
thermal diffusivity (α) and thermal effusivity (e) using the
photoacoustic (PA) technique. The composites exhibit≈
120 % improvement in k at 0.05 wt.% . Furthermore, the
dc electrical conductivity measurements of pure and doped
PMMA, showed that the obtained values were enhanced
about four orders of magnitude for the hig |
