Structural and luminescence enhancement properties of Eu3+/Ag nanocrystallites doped SiO2-TiO2 matrices

Kumar, Kaushal; Revathy, Krishnan; Vasudevan, Prathibha; Thomas, Sunil; Biju, P.R.; Unnikrishnan, N.V.

doi:10.1016/s1002-0721(12)60301-9

Cited by 28 publications

(14 citation statements)

References 22 publications

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“…The highest degradation activity for MO (Liu et al 2007). Kumar et al (2013) investigated the co-doping of silver (Ag) nanocrystals with Eu 3+ -doped SiO 2 -TiO 2 matrices and found a broad absorption band due to the surface plasmon of Ag. The results obtained showed that the fluorescence intensity of Eu 3+ ions was greatly enhanced in the presence of silver nanocrystals (Kumar et al 2013).…”

Section: Co-doping Of Tio 2 With Rare Earth Metalsmentioning

confidence: 99%

“…Kumar et al (2013) investigated the co-doping of silver (Ag) nanocrystals with Eu 3+ -doped SiO 2 -TiO 2 matrices and found a broad absorption band due to the surface plasmon of Ag. The results obtained showed that the fluorescence intensity of Eu 3+ ions was greatly enhanced in the presence of silver nanocrystals (Kumar et al 2013). Previously, it was reported that co-doping lanthanide metal ions successfully shifted the absorption wavelength to visible region (420-450 nm) (Reszczyńska et al 2014 (Reszczyńska et al 2014).…”

Section: Co-doping Of Tio 2 With Rare Earth Metalsmentioning

confidence: 99%

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A mini-review on rare earth metal-doped TiO2 for photocatalytic remediation of wastewater

Saqib

Adnan

Shah

2016

Environ Sci Pollut Res

113

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Titanium dioxide (TiO2) has been considered a useful material for the treatment of wastewater due to its non-toxic character, chemical stability and excellent electrical and optical properties which contribute in its wide range of applications, particularly in environmental remediation technology. However, the wide band gap of TiO2 photocatalyst (anatase phase, 3.20 eV) limits its photocatalytic activity to the ultraviolet region of light. Besides that, the electron-hole pair recombination has been found to reduce the efficiency of the photocatalyst. To overcome these problems, tailoring of TiO2 surface with rare earth metals to improve its surface, optical and photocatalytic properties has been investigated by many researchers. The surface modifications with rare earth metals proved to enhance the efficiency of TiO2 photocatalyts by way of reducing the band gap by shifting the working wavelength to the visible region and inhibiting the anatase-to-rutile phase transformations. This review paper summarises the attempts on modification of TiO2 using rare earth metals describing their effect on the photocatalytic activities of the modified TiO2 photocatalyst.

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Section: Co-doping Of Tio 2 With Rare Earth Metalsmentioning

confidence: 99%

Section: Co-doping Of Tio 2 With Rare Earth Metalsmentioning

confidence: 99%

A mini-review on rare earth metal-doped TiO2 for photocatalytic remediation of wastewater

Saqib

Adnan

Shah

2016

Environ Sci Pollut Res

113

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“…Many RE ions like Eu 3+ , Sm 3+ , Er 3+ , Tb 3+ and Nd 3+ [14] were doped into the TiO 2 to alters the emission in the UV to red region. Among other RE ions, the dysprosium ion (Dy 3+ ) doped materials cover fascinated to a great extent attention due to their white light emission by adjusting the yellow and blue emission [15].…”

Section: Introductionmentioning

confidence: 99%

Microstructural and optical properties of rare earth ions doped TiO2 for potential white LED applications

Zikriya

Nadaf²,

Manjunath

et al. 2018

J Mater Sci: Mater Electron

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Nano ceramics of pure TiO 2 and Dy 3+ , Eu 3+ and Tb 3+ doped TiO 2 are prepared by hydrothermal method and these are characterized by using X-ray diffractometer (XRD), UV-Visible spectroscopy, field emission scanning electron microscopy (FESEM), high resolution transmission electron microscopy (HRTEM), and photoluminescence spectroscopy. XRD analysis revealed that the average particle size of the pure TiO 2 and Dy 3+ , Eu 3+ and Tb 3+ doped TiO 2 are in the range of 45-35 nm and confirms the anatase phase. The FESEM and HRTEM analysis confirm that the obtained ceramics are in nano regime. The absorption spectrum revealed that the bandgap of the TiO 2 ceramics are in the range 3.14-3.2 eV. The PL analysis showed that the doping of Dy 3+ , Eu 3+ and Tb 3+ had improved the luminescence behavior than the pure TiO 2 nanoparticles. Overall, by doping 0.5 mol% concentration of rare earth (RE) greatly alters the structural morphology and directly influence the luminescence behavior of TiO 2 and suitable for advanced optoelectronic applications. The color purity of the studied samples is found to be 91% for Dy 3+ , 84% for Eu 3+ and 73% for Tb 3+ at the excitation of 345 nm, 376 nm and 350 nm respectively. The single-doped sample Eu 3+ : TiO 2 , Tb 3+ : TiO 2 and Dy 3+ : TiO 2 samples showed orange-red, blue-green and white emissions respectively.

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“…In order to improve its photocatalytic activity, many attempts have been made: coupling TiO 2 with other semiconductors of narrow band gap such as PbS [5,6], making composites with other oxide semiconductors such as WO 3 , ZnO and SiO 2 [7][8][9], doping TiO 2 with metals or nonmetals, e.g., Ag, Pd, Pt, N [10][11][12][13], etc. Recently, because of their low density and large specific surface area, TiO 2 hollow spheres have been intensively studied [14][15][16].…”

Section: Introductionmentioning

confidence: 99%

“…hollow spheres (0.5 mg/mL); b the effect of concentration of the catalysts (0.25, 0.5, 1, 2 mg/mL) over photocatalytic decomposition of alizarin red (0.01 mg/mL); c the effect of pH value(3,5,7,9) over photocatalytic decomposition of alizarin red (0.01 mg/mL), d comparison of photocatalytic decomposition of alizarin red (0.5 mg/mL) using different catalysts of bare TiO 2 hollow spheres, TiO 2 :0.5 mol% Gd 3? hollow spheres and commercial P25…”

mentioning

confidence: 99%

Preparation of Gd-doped TiO2 hollow spheres with enhanced photocatalytic performance

Yan

Hou

et al. 2015

J Sol-Gel Sci Technol

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Using (C 16 H 36 O 4 )Ti, Gd 2 O 3 and HNO 3 as raw materials, TiO 2 and TiO 2 :Gd 3? hollow spheres with different Gd dopant concentrations of 0.25, 0.5, 1, 1.5 and 2 mol% were obtained with the assistance of the carbon sphere templates. The morphology, structure, specific surface area and photocatalytic properties of the prepared hollow spheres were studied by scanning electron microscopy, transmission electron microscopy, X-ray diffraction, Brunauer-Emmett-Teller and UV-Vis 2550 spectrophotometer, respectively. Several factors influencing the photocatalytic activities of the samples were studied, which include pH value of the solutions, Gd dopant concentrations, amount of the additive catalysts and types of the dyes. Graphical Abstract In this work, fabrication of TiO 2 : Gd 3? hollow spheres (b) was obtained with the assistance of the carbon sphere template (a). Characterization of the samples was also reported in this paper.

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Structural and luminescence enhancement properties of Eu3+/Ag nanocrystallites doped SiO2-TiO2 matrices

Cited by 28 publications

References 22 publications

A mini-review on rare earth metal-doped TiO2 for photocatalytic remediation of wastewater

A mini-review on rare earth metal-doped TiO2 for photocatalytic remediation of wastewater

Microstructural and optical properties of rare earth ions doped TiO2 for potential white LED applications

Preparation of Gd-doped TiO2 hollow spheres with enhanced photocatalytic performance

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