Effect of annealing temperature on structural and optical properties of ZnAl 2 O 4 :1.5% Pb 2+ nanocrystals synthesized via sol-gel reaction

Motloung, S.V.; Tsega, Moges; Dejene, F.B.; Swart, H.C.; Ntwaeaborwa, O.M.; Koao, L.F.; Motaung, T.E.; Hato, Mpitloane J.

doi:10.1016/j.jallcom.2016.03.170

Cited by 41 publications

(33 citation statements)

References 44 publications

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“…The results showed that the final powder products consist of the impurities of hexagonal ZnO, which agrees very well with the findings in Ref [19]. Therefore, this paper investigates the effects of annealing time (AT) on the structure, morphology and optical properties of the ZnAl 2 O 4 /ZnO.…”

Section: Introductionsupporting

confidence: 89%

“…The last event very close to 300 o C is credited to the crystallization process and the formation of single or mixed phases. Our group [19,26] have previously observed similar kind of trends in ZnAl 2 O 4 . The dehydration of residual nitrates ions are expected in the range of 177 -400 ℃ [27].…”

Section: Fourier Transform Infrared (Ftir) and Thermogravimetric Analsupporting

confidence: 67%

“…There are many other studies on the ZnAl 2 O 4 , which have been reported in literature. Most of these investigations or reports have focused more on the influence of doping concentrations [18], influence of annealing temperature [19,20] ,influence of different aluminium salts [8] and influence of citric acid (CA) content [21] on the morphology, structure and optical properties of the obtained ZnAl 2 O 4 products. However, to the best of our knowledge, the effects of annealing time (AT) on the ZnAl 2 O 4 preparation have not been investigated.…”

Section: Introductionmentioning

confidence: 99%

“…The temperature of 600 o C was kept constant because in our previous results [19], it gave the highest PL emission intensity. Another objective is to identify or explore the optimum AT for the highest PL.…”

Section: Introductionmentioning

confidence: 99%

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Effects of annealing time on the structure and optical properties of ZnAl2O4/ZnO prepared via citrate sol-gel process

Motloung

Kumari

Koao

et al. 2018

Materials Today Communications

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ZnAl 2 O 4 nano-powders have been successfully prepared via citrate sol-gel technique. All powder samples were annealed at 600 o C for 1, 2, and 3 h. Thermogravimetric analysis (TGA) confirmed that the minimum annealing temperature of crystallization is ~ 400 °C. Fourier Transform Infrared (FTIR) results showed a series of absorption peaks in the range of 810-4000 cm-1. The X-ray diffraction (XRD), scanning electron microscopy (SEM) and high-resolution transmission electron microscopy (HR-TEM) results showed that the prepared nano-crystals consists of the mixture of both cubic (ZnAl 2 O 4) and hexagonal (ZnO) structures. Ultra violet visible (UV-vis) spectroscopy revealed that the annealing time (AT) influences the band gap of the prepared phosphor materials. When the 2 samples were excited at 275 nm, two emission peaks at 428 nm (violet) and 561 nm (green-yellow) were observed and they are attributed to the defects levels within the ZnO and ZnAl 2 O 4 band gaps. The Commission Internationale de l'Elcairage (CIE) colour coordinates confirmed that all the prepared samples exhibit the violet emission and varying the AT does not influence the emission colour.

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Section: Introductionsupporting

confidence: 89%

Section: Fourier Transform Infrared (Ftir) and Thermogravimetric Analsupporting

confidence: 67%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Effects of annealing time on the structure and optical properties of ZnAl2O4/ZnO prepared via citrate sol-gel process

Motloung

Kumari

Koao

et al. 2018

Materials Today Communications

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“…This peak shift was significant for the lower Sn concentrations (2 to 6 at.%). The peak shift to the lower angle for PbS:Sn thin films indicates that the lattice parameters are slightly larger than the undoped PbS thin film, which can also be verified by the values obtained in Table . Zheng et al reported similar observation for Cu‐doped PbS thin films.…”

Section: Resultssupporting

confidence: 80%

Band gap tailoring of chemically synthesized lead sulfide thin films by in situ Sn doping

Hone

Dejene

Echendu

2018

Surface & Interface Analysis

Self Cite

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In the present report, undoped and tin (Sn)-doped lead sulfide thin films were synthesized via chemical bath deposition method. The effects of Sn molar concentration on the optical, structural, and morphological properties were systematically studied. The concentration of Sn in the chemical bath was characterized by the ratio of [Sn +2 ]/[Pb +2 ] and varied from 0 to 15 at.%. Both doped and undoped thin films were polycrystalline in nature with a face-centered cubic crystal structure; however, the preferred orientations of the crystallites were varied along the (111) and (200) planes with Sn-doping concentration. The X-ray powder diffraction results also showed that peak intensities and the crystalline size were decreased with increasing Sn concentration.The lattice constant varied with Sn concentration and found in the range of 6.020 to 5.944 Å. The variation of Sn concentration in PbS:Sn thin films were confirmed by energy dispersive X-ray analyses study. The scanning electron microscope and atomic force microscopy studies revealed that Sn doping had a critical role on the surface roughness and morphology of the PbS:Sn thin films. The optical band gap study showed that the band gap of PbS:Sn thin films were engineered from 0.676 to 1.345 eV because of incorporation of Sn +2 ions via cost-effective chemical route.Room temperature photoluminescence spectra showed a well-defined peak at 427 nm and shoulders at 405 and 462 nm for all Sn-doped and undoped PbS samples.

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Effect of citric acid on material properties of ZnGa2O4:Cr3+ nanopowder prepared by sol–gel method

2018

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Effect of annealing temperature on structural and optical properties of ZnAl 2 O 4 :1.5% Pb 2+ nanocrystals synthesized via sol-gel reaction

Cited by 41 publications

References 44 publications

Effects of annealing time on the structure and optical properties of ZnAl2O4/ZnO prepared via citrate sol-gel process

Effects of annealing time on the structure and optical properties of ZnAl2O4/ZnO prepared via citrate sol-gel process

Band gap tailoring of chemically synthesized lead sulfide thin films by in situ Sn doping

Effect of citric acid on material properties of ZnGa2O4:Cr3+ nanopowder prepared by sol–gel method

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