It is well known that nanoscale materials have size depending optical properties 1-2. Rare earth ions as well as sub-50-nm europium oxide nanoparticles are particularly suitable for applications as light emitters due to their well-defined transitions within the 4f shell 3. In this research, we consider that luminescence of lanthanide oxide nanoparticles could be affected even for larger colloids by sensitizing their surface with commonly used fluorescent dyes. Eu2O3 and Er2O3 nanoparticles (d=200 nm) have been prepared by hydrothermal reaction in aqueous solution by precipitation of the hydroxo-carbonate precursor and its subsequent calcination. The particles have been characterised by TEM, UV-vis-NIR and FTIR spectroscopies. By dipping of the lanthanide oxide nanopowders into dye methanol solution (dye: EosinY, Rhodamine 6G, 2’,7’-Dichlorofluorescein, PMMF-Polymethylmetacrilatefluorescein-, Acridine Yellow G) we have obtained dye-sensitized colloidal systems (Oxide@Dye). After the purification and characterisation of the nanopowders, we have prepared spin coated thin films. It was possible to spin coat the powders by redispersion in a Formvar CH2Cl2 solution. We have performed photoluminescence measurements of nanopowders and thin films by using the 3rd harmonic radiation of an Nd laser (8 ns pulses, 40Hz repetition rate), exciting at 348 nm. Emission spectra of Eu2O3 and Er2O3 showed main peaks at 610 and 558 nm, respectively. Oxide@Dye photoluminescence signals differ from the free oxides by the new intense peak arising in the 537-662 nm range, strongly supporting the interaction between dyes and colloidal oxide. In this research, we evidenced the modification of photoluminescent properties by surface sensitization of large oxide nanoparticles provided by fluorescent dyes, forming interesting new materials. References: 1. J.P. Wilcoxon, J.E.Martin; J.Chem.Phys.,108, 1998, 9137 2. M.L. Steigerwald, A.P. Alivisatos, J.M. Gibson, T.D. Harris, R. Kortan, A.J. Muller, A.M. Thayer, T.M. Duncan, D.C. Douglass, L. E. Brus; J.Am.Chem.Soc., 110, 1988, 3046 3. G. Wakefield, H.A. Keron, P.J. Dobson, J. L. Hutchison; J.Coll.Inter.Sci., 215, 1999, 179

Luminescent properties of dye-sensitized lanthanide oxide nanoparticles / F. Porta, Z. Krpetić, A.M. Malvezzi, D. Bajoni, S. Righetto, M. Taccia. ((Intervento presentato al 1. convegno ThinFilm2008 tenutosi a Singapore nel 2008.

Luminescent properties of dye-sensitized lanthanide oxide nanoparticles

F. Porta;Z. Krpetić;S. Righetto;
2008

Abstract

It is well known that nanoscale materials have size depending optical properties 1-2. Rare earth ions as well as sub-50-nm europium oxide nanoparticles are particularly suitable for applications as light emitters due to their well-defined transitions within the 4f shell 3. In this research, we consider that luminescence of lanthanide oxide nanoparticles could be affected even for larger colloids by sensitizing their surface with commonly used fluorescent dyes. Eu2O3 and Er2O3 nanoparticles (d=200 nm) have been prepared by hydrothermal reaction in aqueous solution by precipitation of the hydroxo-carbonate precursor and its subsequent calcination. The particles have been characterised by TEM, UV-vis-NIR and FTIR spectroscopies. By dipping of the lanthanide oxide nanopowders into dye methanol solution (dye: EosinY, Rhodamine 6G, 2’,7’-Dichlorofluorescein, PMMF-Polymethylmetacrilatefluorescein-, Acridine Yellow G) we have obtained dye-sensitized colloidal systems (Oxide@Dye). After the purification and characterisation of the nanopowders, we have prepared spin coated thin films. It was possible to spin coat the powders by redispersion in a Formvar CH2Cl2 solution. We have performed photoluminescence measurements of nanopowders and thin films by using the 3rd harmonic radiation of an Nd laser (8 ns pulses, 40Hz repetition rate), exciting at 348 nm. Emission spectra of Eu2O3 and Er2O3 showed main peaks at 610 and 558 nm, respectively. Oxide@Dye photoluminescence signals differ from the free oxides by the new intense peak arising in the 537-662 nm range, strongly supporting the interaction between dyes and colloidal oxide. In this research, we evidenced the modification of photoluminescent properties by surface sensitization of large oxide nanoparticles provided by fluorescent dyes, forming interesting new materials. References: 1. J.P. Wilcoxon, J.E.Martin; J.Chem.Phys.,108, 1998, 9137 2. M.L. Steigerwald, A.P. Alivisatos, J.M. Gibson, T.D. Harris, R. Kortan, A.J. Muller, A.M. Thayer, T.M. Duncan, D.C. Douglass, L. E. Brus; J.Am.Chem.Soc., 110, 1988, 3046 3. G. Wakefield, H.A. Keron, P.J. Dobson, J. L. Hutchison; J.Coll.Inter.Sci., 215, 1999, 179
13-lug-2008
gold; nanoparticles; dye
Settore CHIM/03 - Chimica Generale e Inorganica
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Luminescent properties of dye-sensitized lanthanide oxide nanoparticles / F. Porta, Z. Krpetić, A.M. Malvezzi, D. Bajoni, S. Righetto, M. Taccia. ((Intervento presentato al 1. convegno ThinFilm2008 tenutosi a Singapore nel 2008.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2434/196857
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