Multifunctional EuYVO 4 nanoparticles coated with mesoporous silica

Abstract

a b s t r a c tMesoporous structures are interesting materials for the incorporation of dyes, drugs, and luminescent systems, leading to materials with important multifunctionalities. In a very unique way, these guest/host materials combine the high stability of inorganic systems, new guest-structuring features, and adsorption mechanisms in their well-defined pores. This work evaluates the luminescent properties of rare earth-doped YVO 4 nanoparticles coated with a mesoporous silica shell. The use of two different synthesis methodologies allowed for particle size control. The crystalline phase emerged without further heat treatment. The mesoporous shell decreased undesirable quenching effects on YVO 4 :Eu 3 þ nanoparticles and rendered them biocompatible. The materials prepared herein could have interesting applications as luminescent markers or drug release systems.

One-step synthesis of luminescent YVO4:Eu3+/γ-Al2O3nanocomposites by spray pyrolysis

“…The Eu 3+ -doped yttrium vanadate (YVO 4 :Eu 3+ ) nanoparticles were prepared by the co-precipitation method [8,15]. Aqueous solutions of Y(NO 3 ) 3 and Eu(NO 3 ) 3 at 0.1 mol l −1 and with pH between 4 and 5 were prepared by dissolving the respective oxides in the presence of nitric acid.…”

“…These levels are designated Stark Levels and have well-known energy as shown by the Dieke diagram, with emissions ranging from the ultraviolet to the infrared regions of the electromagnetic spectrum [3]. Lanthanide-doped nanomaterials have a wide field of industrial applications; they can be used as nanothermometers [4], lasers [5,6], UVC dielectric barrier discharge lamps [7], and luminescent markers [8,9]. Systematic control of different parameters such as the local symmetry of the lanthanide ion, the chemical environment around this ion, the host phonon energy, and the solubility of the lanthanide ion in the matrix is necessary for all these applications.…”

“…Luminescent RE-doped lanthanide orthovanadates (LaVO 4 :RE) have been used to prepare different multifunctional materials like laser [18], luminescent sensors [19], scintillators [20], biomarkers, and drug delivery systems [8,21]. Huignard et al have shown that, besides preventing other negative effects, coating of YVO 4 :Eu 3+ nanoparticles with silica avoids quenching effects due to absorption of water by the phosphor [14].…”

“…Huignard et al have shown that, besides preventing other negative effects, coating of YVO 4 :Eu 3+ nanoparticles with silica avoids quenching effects due to absorption of water by the phosphor [14]. Justino et al [8] have coated YVO 4 with a mesoporous shell, to obtain non-toxic luminescent nanoparticles for drug delivery. The YVO 4 :Eu 3+ nanoparticles incorporated into alumina obtained herein could be potentially applied as biomarker and active host for Random Laser systems, for instance, with the advantage that the SP methodology can be used on a lab or on an industrial scale (some grams to kilos, respectively).…”

Sistemas compósitos luminescentes para geração de LASER em ambiente randômico

“…Além disso, em geral esses materiais híbridos têm propriedades mecânicas superiores e melhor processabilidade do que complexos puramente moleculares de lantanídeos [68]. Nanopartículas de YVO4 dopadas com Eu 3+ são um forte candidato para aplicações em fotônica porque sua estrutura permite grande solubilidade do íon terra rara e, consequentemente, alta eficiência de luminescência devida a excitação do íon TR 3+ via grupo vanadato [76]. Caroline Alves -Dissertação de Mestrado [85].…”