PAULA PINHEIRO PAGANINI

PAULA PINHEIRO PAGANINI

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Synthesis and luminescence properties of TiOsub(2)TiO2@SnOsub(2) nanoparticles doped with terbium
2015 - PAGANINI, PAULA P.; RODRIGUES, LUCAS C.V.; NAKAMURA, LIANA K.O.; BRITO, HERMI F.; FELINTO, MARIA C.F.C.
Europium betha-diketonate complexes with tetracycline (TC)
2010 - FELINTO, M.C.F.C.; PAGANINI, P.P.; SANTOS, T.A.; BRITO, H.F.; TEOTONIO, E.E.S.
Luminescent materials containing trivalent rare earth (RE3+) complexes with β-diketonate ligands have been intensively studied in recent years. The RE3+ compounds present characteristic narrow emission bands in the UV-Vis region, large Stokes shift and the antenna effect that enhance the overall quantum efficiency, As a result, these complexes have found wide applications as luminescent markers, photoluminescent sensors, electroluminescent devices, and multicolor display. In this work it was synthesized four new complexes of europium -diketonate with tetracycline as ligand. IR spectra of the Eu(III) complexes show two strong absorption bands at ~1597 and ~1566 cm-1 attributed to s(C=O) and as(C=O) vibrational stretching modes, suggesting that the -diketonate ligand acts as chelate ligand. SEM image showed particles rounded with grain size lower than 10 nm (Fig 1). The emission spectrum of europium complexes, in the solid state, recorded in the range of 420 to 720 nm at liquid nitrogen temperature, under excitation at -diketonate transitions (~350 nm) is shown in Fig. 2. This emission spectrum exhibits characteristic narrow emission bands that are assigned to the 4f6-4f6 transitions of Eu(III) ion, emanating from the emitting 5D0 level to the 7FJ (J = 0, 1, 2, or 4) levels, where the most intense corresponds to 5D07F2 transition taking place around 613 nm. An important feature to be observed is the nonexistence of broaden bands arising from the -diketonate centered transitions, indicating that intramolecular energy transfer from the -diketonate ligands to the Eu(III) ion is operative.
Potential applications for the use of rare earth complexes and nanoparticles as luminescent biolabels
2010 - FELINTO, M.C.F.C.; KODAIRA, C.A.; PAGANINI, P.P.; SANTOS, E.G.; LOURENCO, A.V.S.; BRITO, H.F.; NUNES, L.A.O.; MALTA, O.L.; SANCHES, E.; GIDLUND, M.; GOTO, H.; BRITO, M.E.F.
The ever growing interest in rare earth coordination compounds and materials wilh optical properties stems from applications in multidisciplinar fields such as nanosensors, materials for telecommunications. lighting devices, and luminescent probes for bioanalyses and live cell imaging and sensing. Most of these applications use the unique ability of lhe rare earth ions to emit well-defined narrow bands in different spectral ranges, from visible to near-infrared. Due to the low absorption cross-section of the f.f transitions, efficient population of lhe excited 4f states has to rely on energy transfer from the surroundings of Ihe metal ion (antena effect or luminescence sensitization). Another point desirable is the use of RE3+ ions wilh emission in the near-infrared (NIR) region reducing !he interference from biological materials in the analyses. In this work. we report the preparation and characterization of rare earth coordination compounds and nanoparticles based on rare earth ions. RE3+ beta-diketonate complexes with macrocyclic ligand has been synthesized and characterized and are being used to mark hemoglobin S (sickle cells) Leishmania (tropical disease) and PSA (Prostate-specific antigen that is a protein produced by cells of the prostate gland. The PSA test measures the level of PSA in the blood). Several nanoparticles based on Nd3+, Eu3+ and Tb3+ ions doped into the Y2O3 matrix. are also being synthesized and evaluated for labeling anti-oxLDL (anti-oxidized low density lipoproteins), one of the principal causes of cardiovascular diseases and responsible for around 30% of deaths world-wide. information about struture and average grain size of these nanoparticles were obtained by x-ray diffration (XRDJ, transmission electron micrograph (TEM) and infrared absorption spectroscopy.
Novos materiais a base de estanho para serem utilizados como trocadores inorganicos na adsorcao do Ga
2001 - PAGANINI, P.P.; FELINTO, M.C.F.C.
Persistent luminescence of Prsup(3+) in CdSiOsub(3)
2012 - RODRIGUES, LUCAS C.V.; CARVALHO, JOSE M.; HOLSA, JORMA; LASTUSAARI, MIKA; PAGANINI, PAULA P.; FELINTO, MARIA C.F.C.; BRITO, HERMI F.
Síntese e caracterização do óxido misto estanho/titânio dopado com térbio para utilização em biomarcadores
2012 - PAGANINI, PAULA P.; RODRIGUES, LUCAS C.V.; BRITO, HERMI F.; HOLSA, JORMA; NUNES, LUIZ A.O.; FELINTO, MARIA C.F.C.
Síntese de nanopartículas de PHB dopadas com 'beta'dicetonatos de terras raras para uso como biomarcadores luminescentes
2012 - ENGELMANN, KLAUSS; PAGANINI, PAULA P.; TEOTONIO, ERCULES E.S.; FELINTO, MARIA C.F.C.; BRITO, HERMI F.
Synthesis, characterization and spectroscopic properties of nanosize Eusub(2)(MoOsub(4))sub(3) and Eu3+:Ysub(2)(MoOsub(4))sub(3)
2012 - DIAS, CLARISSA L.; PAGANINI, PAULA P.; RODRIGUES, LUCAS C.V.; HOLSA, JORMA; MALTA, OSCAR M.; BRITO, HERMI F.; FELINTO, MARIA C.F.C.
Synthesis, characterization and spectroscopic studies of tin/titanium mixed oxide nanoparticles doped with europium for use in biomarkers
2012 - PAGANINI, PAULA P.; RODRIGUES, LUCAS C.V.; HOLSA, JORMA; NUNES, LUIZ A.O.; MALTA, OSCAR L.; BRITO, HERMI F.; FELINTO, MARIA C.F.C.
Estudo de propriedades luminescentes de nanoparticulas de SnOsub(2)/TiOsub(2):Eusup(3+) para atuarem como marcadores em fluoroimunoensaio
2007 - PAGANINI, PAULA P.; KODAIRA, CLAUDIA A.; STEFANI, ROBERVAL; FELINTO, MARIA C.F. da C.; BRITO, HERMI F. de; MALTA, OSCAR M.L.; TEOTONIO, ERCULES E. de S.