Tailoring red-green-blue emission from Er3+, Eu3+ and Tb3+ doped Y2O3 nanocrystals produced via PVA-assisted sol-gel route

Sobral, G. A.; Gomes, Maria A.; Avila, Jhon F. Martinez; Rodrigues, José J.; Macedo, Zélia Soares; Hickmann, Jandir M.; Alencar, Márcio A. R. C.

doi:10.1016/j.jpcs.2016.06.010

Cited by 17 publications

(5 citation statements)

References 57 publications

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“…The variation in morphology for Y 2 O 3 has already been reported in the literature. The Y 2 O 3 samples obtained by the sol-gel method with PVA without pH control have well-defined, coalesced spherical particles [9]. However, it should be considered that the samples were calcined at 1000 °C for 5 h, which probably favored the coalescence process.…”

Section: Resultsmentioning

confidence: 99%

“…For example, Nd-doped Y 2 O 3 nanocrystals synthesized by sol-gel route were investigated for application in temperature sensing of biological systems [4]. In the literature, doped-Y 2 O 3 nanoparticles have been synthesized via the PVA-assisted sol-gel method for employment in luminescence applications [9]. However, the influence of pH in the synthesis was not investigated.…”

Section: Introductionmentioning

confidence: 99%

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Tailoring the properties of Y2O3 via synthesis parameters varied during the PVA-assisted sol-gel route

et al. 2023

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The effect of synthesis parameters on the microstructural behavior and morphology during the yttrium oxide (Y 2 O 3 ) formation is reported. Y 2 O 3 crystals were produced by a modified sol-gel route assisted by polyvinyl alcohol solution varying the calcination temperature and solution pH. The crystalline phase formation was investigated using X-ray powder diffraction combined with the Rietveld refinement method. The microstructural properties were analyzed by using the Williamson-Hall formalism. The calcination temperature followed the thermal events observed in the differential thermal analysis combined with the thermogravimetric analysis of the precursor xerogel. It was seen that the combination of PVA and pH variation can be used to minimize the calcination time and temperature. The morphological analysis showed samples with different sizes and appearances depending on pH and calcination temperature. Therefore, it was shown that the parameters in the synthesis process can be used to tailor the properties of Y 2 O 3 , such as crystallite size, degree of structural ordering, and morphology, and consequently, improve the desired application.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Tailoring the properties of Y2O3 via synthesis parameters varied during the PVA-assisted sol-gel route

et al. 2023

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“…This synthesis was based on the methodology described by Sobral et al [39] through a solgel route. First, Gd(CH 3 COO) 3 •6H 2 O (0.2 g) was mixed with 0.002 g of Eu(CH 3 COO) 3 •6H 2 O, and 2.0 mL of water was added.…”

Section: Synthesis Of Gadolinium Oxide Doped With Europium Nanoparticlesmentioning

confidence: 99%

Novel Scintillating Nanoparticles for Potential Application in Photodynamic Cancer Therapy

et al. 2022

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The development of X-ray-absorbing scintillating nanoparticles is of high interest for solving the short penetration depth problem of visible and infrared light in photodynamic therapy (PDT). Thus, these nanoparticles are considered a promising treatment for several types of cancer. Herein, gadolinium oxide nanoparticles doped with europium ions (Gd2O3:Eu3+) were obtained by using polyvinyl alcohol as a capping agent. Hybrid silica nanoparticles decorated with europium-doped gadolinium oxide (SiO2-Gd2O3:Eu3+) were also prepared through the impregnation method. The synthesized nanoparticles were structurally characterized and tested to analyze their biocompatibility. X-ray diffraction, scanning electron microscopy, and transmission electron microscopy confirmed the high crystallinity and purity of the Gd2O3:Eu3+ particles and the homogeneous distribution of nanostructured rare earth oxides throughout the fumed silica matrix for SiO2-Gd2O3:Eu3+. Both nanoparticles displayed stable negative ζ-potentials. The photoluminescence properties of the materials were obtained using a Xe lamp as an excitation source, and they exhibited characteristic Eu3+ bands, including at 610 nm, which is the most intense transition band of this ion. Cytotoxicity studies on mouse glioblastoma GL261 cells indicated that these materials appear to be nontoxic from 10 to 500 μg·mL−1 and show a small reduction in viability in non-tumor cell lines. All these findings demonstrate their possible use as alternative materials in PDT.

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“…Coil coating manufactures have long relied on outdoor exposure and appearance-based measurements, such as gloss retention and color change to monitor the condition of the coating. , A major limitation of these methods is the long period of time (years) required for significant changes to take place. Although accelerated weathering tests have been developed, results obtained from such methods can be, dependent on the environment, difficult to correlate with long time outdoor exposures. ,, In addition, comparisons of chemical degradation effects on specific systems, such as polyester melamine, after field testing and accelerated weathering are rare.…”

Section: Introductionmentioning

confidence: 99%

Depth-Resolved FTIR-ATR Imaging Studies of Coating Degradation during Accelerated and Natural Weathering─Influence of Biobased Reactive Diluents in Polyester Melamine Coil Coating

et al. 2022

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Improved methods to assess the degradation of coil coatings to approximate lifetime have been an area of academic and industrial interest for decades. This work aims to elucidate the differences in the degradation behavior of two coil coating systems: one standard commercial formulation and one formulation with a significant addition of biorenewable reactive diluents. Depth-resolved degradation behavior of samples exposed to accelerated and natural field weathering is assessed. Focal plane array attenuated total reflection-Fourier transform infrared spectroscopy was used to acquire high-resolution chemical data from a sloping cross section. The results agreed with conventional photoacoustic spectroscopy. Degradation profiles for the two coatings were significantly different, with the biobased samples showing a more durable behavior. This study provides a method for detailed assessment of coating degradation, giving a good estimation of its durability. This is both a way to compare the performance of coating systems and to improve the understanding of the impact of exposure conditions, paving the way for the development of more sustainable coil coatings.

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Tailoring red-green-blue emission from Er3+, Eu3+ and Tb3+ doped Y2O3 nanocrystals produced via PVA-assisted sol-gel route

Cited by 17 publications

References 57 publications

Tailoring the properties of Y2O3 via synthesis parameters varied during the PVA-assisted sol-gel route

Tailoring the properties of Y2O3 via synthesis parameters varied during the PVA-assisted sol-gel route

Novel Scintillating Nanoparticles for Potential Application in Photodynamic Cancer Therapy

Depth-Resolved FTIR-ATR Imaging Studies of Coating Degradation during Accelerated and Natural Weathering─Influence of Biobased Reactive Diluents in Polyester Melamine Coil Coating

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