Radiation effects on Eu-complex-doped PMMA and nanosilver compounds after exposure to γ-irradiation

Abstract

The evaluation of the stability of PMMA/europium (III) complexes with various ligands: 3-thenoyltrifluoroacetonate (TTA), triphenyl phosphine oxide (TTPO) and water assisted by g-irradiation is the goal of this study. The nonisothermal chemiluminescence (CL) measurements reveal the dependence of this stability on the filler concentration. The values of onset oxidation temperature (OOT) obtained from CL spectra are the basic characterization criteria, which are correlated with the sample composition, the irradiation dose and the environment containing the radiolysis fragments. The systems investigated were the luminescent systems PMMA:Ag:Eu(tta)3 and PMMA:Ag:Eu(tta)3(tppo)2 obtained from the PMMA doped with europium (III) complexes. The inclusion of silver nanoparticles into the molecular structures of complexes diminishes the rate of oxidation through the mechanism of RO. scavenging by action of the nanosilver. The Europium ion emitter, surrounded by the ligand had Eu(III) luminescence enhancement, rationalized by the local field enhancement produced by the surface plasmons in silver NPs. The results indicate that these materials have optical marker properties for integrating special devices subjected to high energy transfers.