Effect of Cu-doping on structural, optical and photoluminescence properties of zinc titanates synthesized by solid state reaction

Budigi, Lokesh; Rao, N. Madhusudhana

doi:10.1007/s10854-016-4290-2

Cited by 12 publications

(8 citation statements)

References 25 publications

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“…The absence of Cu-related peaks rules out the existence of Cu-based clusters within the detection limit of XRD due to the low intentional incorporation caused by the synthesis method. After copper doping, the slight peak shift towards the larger 2θ angle in relation to the undoped ZnO is related to diffusion and consequently the replacement of Zn 2+ ions in the lattice by Cu 2+ ions without considerably altering the crystal structure, since both have similar ionic radii 39,40 .…”

Section: Resultsmentioning

confidence: 99%

Photodegradation of Ciprofloxacin-Zinc Complexes Produced at the Interface of ZnO and Cu-Doped ZnO Crystals

et al. 2021

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Ciprofloxacin hydrochloride (CIPRO) is considered an emerging pollutant in aquatic environments with the capacity to disseminate antibiotic resistance. Considering the pro-oxidant potential of ZnO and Cu-doped ZnO (Cu-ZnO) wurtzite crystals, the potential Ciprofloxacin photodegradation by these materials was investigated. CIPRO titration with ZnO and Cu-ZnO promoted the formation of zinc complexes and ~4% antibiotic adsorption. The carboxylic groups of CIPRO can complex Zn 2+ by promoting the nanoetching of ZnO and Cu-ZnO crystallite surfaces. The alkaline interfaces provided by ZnO create a microenvironment favorable for Zn 2+ chelation by CIPRO carboxylates. The photodegradation degree was similar for CIPRO and CIPRO-Zn under UV light, as revealed by UV-visible spectroscopy and FTIR. Therefore, the ZnO and Cu-ZnO crystals contributed to the formation of CIPRO-Zn rather than the photo-oxidative degradation of the antibiotic. Considering that CIPRO-Zn chelates disfavor bacterial selection for resistance, the treatment of CIPRO-contaminated effluents with ZnO and Cu-ZnO can facilitate desirable metal chelation without impairing photodegradation.

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Section: Resultsmentioning

confidence: 99%

Photodegradation of Ciprofloxacin-Zinc Complexes Produced at the Interface of ZnO and Cu-Doped ZnO Crystals

et al. 2021

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“…The lattice parameters obtained from Rietveld refinements (Table 1) indicate samples with a cubic (face-centered) space group. Due to the small difference between the values shown in Table 1 (< 0.3%), the cell volume of Zn 2 TiO 4 and Zn 2(1-x) Ni 2x TiO 4 samples can be considered unchanged when Ni 2+ ion is inserted in the host 27 .…”

Section: Resultsmentioning

confidence: 99%

Photoluminescence, Photoacoustic and Structural Characteristics of Polycrystalline Zn2TiO4: Ni2+ Semiconductor

et al. 2020

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This work presents the investigation, at room temperature, of Zn 2 TiO 4 samples containing Ni 2+ ions as substitutional impurities. Samples with molecular formula Zn 2(1-x) Ni 2x TiO 4 , where x = 0.00, 0.0007, 0.001, 0.0013, 0.002 and 0.003, in which Zn 2+ ions were replaced by Ni 2+ ions, were prepared through solid-state method, crystalline data were obtained by X-ray diffraction, the elemental composition was determined by X-ray fluorescence and the optical properties were investigated through photoluminescence and photoacoustic techniques. The photoluminescence spectra showed broadbands from 640 nm to 800 nm. The emission of the Zn 2(1-x) Ni 2x TiO 4 samples was assigned to the overlapping of the Ni 2+ and the Zn 2 TiO 4 emission. The most intense photoluminescence signal was obtained with excitation radiation at a wavelength of 360 nm for the sample with x = 0.001. The photoacoustic spectra showed absorption bands characteristic of semiconductor materials due to the host Zn 2 TiO 4 . The energy bandgap of the Zn 2(1-x) Ni 2x TiO 4 was obtained from photoacoustic absorption spectra.

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“…A work reporting the optical properties of this lattice doped with Ni 2+ is in development and will be published soon. Lokesh presents the optical properties of Zn 1-x Cu x TiO 3 , showing that the addition of Cu enhanced the photoluminescence of the undoped lattice in the UV region [17]. Girish investigated Zn 2 TiO 4 :Eu 3+ , Zn 2 TiO 4 :Dy 3+ and Zn 2 TiO 4 :Sm 3+ and found that the narrow band emission of these phosphors in the visible region is related to the f-f transitions of rare earth dopants [6,8,18].…”

Section: Introductionmentioning

confidence: 99%

Zn2TiO4 photoluminescence enhanced by the addition of Cr3+

2019

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In this work, the photoluminescent properties of Zn 2 TiO 4 :Cr 3+ are presented. Samples were prepared from ZnO, TiO 2 and Cr 2 O 3 by solid-state reaction. The compound formation was confirmed by X-ray diffraction. Emissions were obtained using photoluminescence spectroscopy at room temperature. The system crystallizes in the space group Fd3m with an inverse spinel structure. The emission spectrum presents a broad and intense band in the near-infrared region. Photoluminescence excitation shows two bands in the visible frequency range assigned to octahedral Cr 3+ transitions. Cr 3+-doped and undoped sample emissions were compared. Optical spectra were analyzed and interpreted according to the crystal field theory and the Tanabe-Sugano energy matrices for the d 3 configuration by calculating the Dq and B parameters. This work is a follow-up of the previous research on transition metal cations used as dopants in a Zn 2 TiO 4 lattice, and the current results suggest that the system might be a promising luminescence source at room temperature.

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Effect of Cu-doping on structural, optical and photoluminescence properties of zinc titanates synthesized by solid state reaction

Cited by 12 publications

References 25 publications

Photodegradation of Ciprofloxacin-Zinc Complexes Produced at the Interface of ZnO and Cu-Doped ZnO Crystals

Photodegradation of Ciprofloxacin-Zinc Complexes Produced at the Interface of ZnO and Cu-Doped ZnO Crystals

Photoluminescence, Photoacoustic and Structural Characteristics of Polycrystalline Zn2TiO4: Ni2+ Semiconductor

Zn2TiO4 photoluminescence enhanced by the addition of Cr3+

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