ChemInform Abstract: Efficient Photoluminescence of Dy<sup>3+</sup> at Low Concentrations in Nanocrystalline ZrO<sub>2</sub>.

“…They discovered that a concentration of 2% Dy in ZrO 2 produces the extreme comparative luminescence intensity having wavelength of 480 nm. The effective photoluminescence in nanocrystalline zirconia was reported at low Dy concentrations [10].…”

Section: Introductionmentioning

confidence: 99%

Synthesis of ZrO₂:Dy³⁺ Nanoparticles: Photoluminescent, Photocatalytic, and Electrochemical Sensor Studies

Gurushantha

Anantharaju

Kottam

et al. 2022

Adsorption Science & Technology

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Solution combustion was employed to create a series of ZrO2:Dy3+ (1-11 mol percent) nanoparticles (NPs) using oxalyl dihydrazide (ODH) as the fuel. ZrO2:Dy3+ NPs were subjected to calcination at about 700°C. ZrO2:Dy3+ NPs comprised of 1 to 11 mol% of Dy3+ were characterized by employing the X-ray diffraction (XRD), transmission electron microscopic (TEM), UV-visible, and X-ray photoelectron spectroscopic (XPS) techniques. The crystallite diameters of 1 to 11 mol% ZrO2:Dy3+ NPs were observed to range from 8.1 nm to 16.3 nm, exhibiting spherical shape. According to BET tests, the pore volume of ZrO2:Dy3+ NPs was determined to be 100.129 cm3/g. The mean pore diameter of ZrO2:Dy3+ NPs was determined to be 4.803 nm from the Barrett-Joyner-Halenda (BJH) plot. The photoluminescence and photocatalytic dye degradation properties of ZrO2:Dy3+ NPs were investigated. The acid red 88 (AR88) dye was applied to appraise the photocatalytic activities of the NPs under UV irradiation. ZrO2:Dy3+ NPs with 3 mol% Dy3+ exhibited improvised photocatalytic activity due to the operative departure of charge carriers. The electrochemical examination of ZrO2:Dy3+ NP modified carbon paste electrode in 0.1 N HCl demonstrated considerable redox potential output, as evidenced by cyclic voltammetric and amperometric measurements. The electrochemical sensor studies on ZrO2:Dy3+ NPs exhibited potentiality towards sensing of highly toxic metals like mercury and lead.

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“…11−13 Among rare-earth elements, dysprosium (Dy 3+ ) exhibits visible luminescence by producing strong emission in both the blue (470−500 nm) and yellow (570−600 nm) region. 14 Dy 3+ possesses a high magnetic moment (μ = 10.2 μB) and an asymmetric electronic ground state (6H15/2), and therefore its presence in compounds will lead to a good transverse relaxivity at high magnetic fields, which makes them suitable for the design of negative (T2) magnetic resonance imaging (MRI) contrast agents. 15 The high atomic number (Z = 66) and relatively high K-edge energy (53.8 keV) of Dy 3+ also provides a higher X-ray attenuation coefficient at 100 keV (3.36 cm 2 •g −1 ) than the commercially available iodine-based computed tomography contrast agents.…”

Section: Introductionmentioning

confidence: 99%

Tetragonal to Cubic Transformation of SiO₂-Stabilized ZrO₂ Polymorph through Dysprosium Substitutions

2017

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Partially stabilized tetragonal zirconia (t-ZrO2) is of particular interest for hard tissue replacements. Ageing related failures of the ceramic associated with the gradual transformation from t-ZrO2 to m-ZrO2 (monoclinic zirconia) can lead to its premature removal from the implant site. In addition, monitoring the satisfactory performance of the implant throughout its life span without invasive techniques is a challenging task. The magnetic resonance imaging (MRI) contrast ability of dysprosium (Dy 3+ ) is well established. To this aim, varied levels of Dy 3+ additions in the ZrO2-SiO2 binary oxide system have been explored. The results indicate the effective role of Dy 3+ in the formation of thermally and mechanically stable c-ZrO2 (cubic zirconia) phase at higher temperatures. The presence of SiO2 influenced the t-ZrO2 stabilization whereas Dy 3+ tends to occupy the ZrO2 lattice sites to induce c-ZrO2 transition. Magnetic and magnetic resonance imaging (MRI) tests displayed the commendable contrast ability of Dy 3+ stabilized ZrO2-SiO2 binary systems. Nanoindentation results demonstrate a remarkable enhancement on the mechanical properties.Keywords: Silica; Zirconia; Dysprosium; Stabilization; Mechanical. 3 IntroductionThe demand for bone implants is growing rapidly due to the increasing incidents of trauma and age related defects caused by osteoporosis. In view of the above potential advantages of Dy 3+ as an addition to ZrO2-SiO2 binary oxides in terms of increased t-ZrO2 stability and enhance MRI image contrast, we present a study of the influence of Dy 3+ on the ZrO2-SiO2 binary oxide system through in-situ sol-gel synthesis, followed by a systematic analysis of the resulting phase composition and structure, mechanical strength and imaging contrast features. Materials and Methods Powder synthesisThe synthesis of Dy 3+ doped ZrO2-SiO2 (DZS) binary oxides was achieved through the sol-gel method. Analytical grade Dy(NO3)3.H2O, ZrOCl2·8H2O and (C2H5)4OSi (TEOS), all procured from Sigma-Aldrich, India, were taken as precursors for the synthesis. The molar concentrations of ZrOCl2·8H2O and (C2H5)4OSi were maintained at a constant ratio of 1: 1 throughout the 5 synthesis whereas the Dy(NO3)3 additions were adjusted to obtain a wide range of compositions.Additionally, a pure ZrO2-SiO2 binary with 1:1 molar ratio was prepared for comparative purposes. The molar concentrations of the different precursors and the respective sample codes are reported in Table 1; the same codes will be used throughout the manuscript. The synthetic procedure is briefly explained as follows. Previously prepared Dy(NO3)3 stock solution as detailed in Table 1 was added to the ZrOCl2 solution under vigorous stirring. The required amount of ethanol was added to this continuously stirred mixture at an operating temperature of 80 °C for 30 minutes. This was followed by the addition of 1 M TEOS to the solution under constant stirring conditions and finally 0.1 M of HNO3 was added to this mixture as a catalyst. The homogeneous solut...

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ChemInform Abstract: Efficient Photoluminescence of Dy³⁺ at Low Concentrations in Nanocrystalline ZrO₂.

Cited by 7 publications

References 1 publication

Blue and red emission in wide band gap BaZrO3:Yb3+,Tm3+

Blue and red emission in wide band gap BaZrO3:Yb3+,Tm3+

Synthesis of ZrO₂:Dy³⁺ Nanoparticles: Photoluminescent, Photocatalytic, and Electrochemical Sensor Studies

Tetragonal to Cubic Transformation of SiO₂-Stabilized ZrO₂ Polymorph through Dysprosium Substitutions

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ChemInform Abstract: Efficient Photoluminescence of Dy3+ at Low Concentrations in Nanocrystalline ZrO2.

Cited by 7 publications

References 1 publication

Blue and red emission in wide band gap BaZrO3:Yb3+,Tm3+

Blue and red emission in wide band gap BaZrO3:Yb3+,Tm3+

Synthesis of ZrO2:Dy3+ Nanoparticles: Photoluminescent, Photocatalytic, and Electrochemical Sensor Studies

Tetragonal to Cubic Transformation of SiO2-Stabilized ZrO2 Polymorph through Dysprosium Substitutions

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ChemInform Abstract: Efficient Photoluminescence of Dy³⁺ at Low Concentrations in Nanocrystalline ZrO₂.

Synthesis of ZrO₂:Dy³⁺ Nanoparticles: Photoluminescent, Photocatalytic, and Electrochemical Sensor Studies

Tetragonal to Cubic Transformation of SiO₂-Stabilized ZrO₂ Polymorph through Dysprosium Substitutions