Light-Emitting Polymer Nanocomposites

Abstract

Inorganic nanoparticles doped with optically active rare-earth ions and coated with organic ligands were synthesized in order to create fluorescent polymethyl methacrylate (PMMA) nanocomposites. Two different aromatic ligands (acetylsalicylic acid, ASA and 2-picolinic acid, PA) were utilized in order to functionalize the surface of Tb 3+ : LaF 3 nanocrystals. The selected aromatic ligand systems were characterized using infrared spectroscopy, thermal analysis, rheological measurements, and optical spectroscopy. Nanoparticles produced in situ with the PMMA contained on average 10 wt% loading of Tb 3+ : LaF 3 at a 6 : 1 La : Tb molar ratio and ∼7 wt% loading of 4 : 1 La : Tb molar ratio for the PA and ASA systems, respectively. Measured diameters ranged from 457±176 nm to 150 ± 105 nm which is indicative that agglomerates formed during the synthesis process. Both nanocomposites exhibited the characteristic Tb 3+ emission peaks upon direct ion excitation (350 nm) and ligand excitation (PA : 265 nm and ASA : 275 nm).

Electro-catalytic degradation pathway and mechanism of acetamiprid using an Er doped Ti/SnO2–Sb electrode

“…Castan et al and Gipson et al obtained similar conclusions in previous studies 51,52. (B) MS spectrograms of ACT after treatment for 90 min in negative ion mode, MS range: 60-420.…”

“…Castan et al and Gipson et al obtained similar conclusions in previous studies. 51,52 The two new absorption peaks corresponded to the R band and B band of the pyridine ring. The pyridine ring connected with auxochrome, i.e., hydrogen bonded at the pyridine nitrogen and carbonyl group, 53 promoted the absorption band to red shi.…”