Surfactants-assisted synthesis of ZnWO4 nanostructures: A view on photocatalysis, photoluminescence and electron density distribution analysis

Sivaganesh, D.; Saravanakumar, S.; Sivakumar, V.; Rajajeyaganthan, R.; Arunpandian, M.; Gopal, J. Nandha; Thirumalaisamy, T. K.

doi:10.1016/j.matchar.2019.110035

Cited by 47 publications

(18 citation statements)

References 34 publications

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“…The optical band gap of monoclinic ZnWO 4 has been determined by UV−Vis optical spectroscopy (Figure S10). A Tauc plot of (αhν) 2 vs. hν yielded a direct optical band gap of 3.3 eV, which is similar to previous reports in the literature [33,34]. Nevertheless, strong variations of the ZnWO 4 optical band gap, depending on particular process parameters, have been published before [35].…”

Section: Resultssupporting

confidence: 88%

Reactive Dual Magnetron Sputtering: A Fast Method for Preparing Stoichiometric Microcrystalline ZnWO4 Thin Films

et al. 2021

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Thin films of ZnWO4, a promising photocatalytic and scintillator material, were deposited for the first time using a reactive dual magnetron sputtering procedure. A ZnO target was operated using an RF signal, and a W target was operated using a DC signal. The power on the ZnO target was changed so that it would match the sputtering rate of the W target operated at 25 W. The effects of the process parameters were characterized using optical spectroscopy, X-ray diffraction, and scanning electron microscopy, including energy dispersive X-ray spectroscopy as well as X-ray photoelectron spectroscopy. It was found that stoichiometric microcrystalline ZnWO4 thin films could be obtained, by operating the ZnO target during the sputtering procedure at a power of 55 W and by post-annealing the resulting thin films for at least 10 h at 600 °C. As FTO coated glass substrates were used, annealing led as well to the incorporation of Na, resulting in n+ doped ZnWO4 thin films.

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Section: Resultssupporting

confidence: 88%

Reactive Dual Magnetron Sputtering: A Fast Method for Preparing Stoichiometric Microcrystalline ZnWO4 Thin Films

et al. 2021

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“…Sivagaesh et al . [ 20 ] verified the near blue emission at 430 nm in pristine ZnWO 4 at 800°C in the ZnWO 4 material which corresponded to the transition between oxygen and tungsten atoms ( 1 T 1u → 1 A 1g ) due to electron–hole recombination from internal vacancies for the tungsten atom. Huang [ 32 ] reported that intrinsic defects such as O, W, and Zn vacancies are likely to be candidates for luminescence centres that gave broad band PL emission for ZnWO 4 .…”

Section: Resultsmentioning

confidence: 87%

“…The observed X‐ray diffraction profiles showed good agreement with the standard JCPDS pattern of ZnWO 4. [ 20 ] Experimental X‐ray diffraction (XRD) patterns of various percentages of Eu 3+ ‐doped ZnWO 4 materials are shown in Figure 1. Figure 1(b) shows an enlarged diffraction peak in the (111) plane in the 2θ region situated between 28.5° and 32°.…”

Section: Resultsmentioning

confidence: 99%

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ZnWO₄:Eu³⁺ phosphor with intense blue LED excitation: photoluminescence and electron density distribution analysis

et al. 2020

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A high intensity 464 nm excitable ZnWO4:Eu3+ red‐emitting phosphor for warm white lighting applications was prepared using a solid‐state reaction method by varying the dopant Eu3+ concentration. Crystalline purity and phase identification was confirmed and revealed using powder X‐ray diffraction and Rietveld refinement analysis. The surface morphology of Zn1‐xEuxWO4 (x = 0, 0.01, 0.02, 0.03, 0.04 and 0.05) was examined using scanning electron microscopy (SEM) techniques. From SEM analysis, the ZnWO4:Eu3+ phosphor prepared at 1–3% molar Eu3+ concentrations exhibited a small pebble‐like morphology with a smooth surface. On increasing the molar concentration of Eu3+ to >3%, the pebble stone morphology disappeared and a large, smooth irregular polygon‐shaped granular‐like morphology was obtained. Of the higher mol% Eu3+, the 4% Eu3+‐doped ZnWO4 showed the best photoluminescence properties with high intensity and sharp excitation at 395 and 464 nm, followed by red emission centred at 615 nm with excellent CIE coordinates (x = 0.58 and y = 0.41) in the core red region. Elemental composition and chemical state analysis were carried out for the 4% Eu3+‐doped ZnWO4 phosphor using X‐ray photoelectron spectroscopy and energy dispersive X‐ray spectroscopy studies. Based on all the above analyses, the Eu3+‐doped ZnWO4 phosphor was found to be a very efficient red‐emitting phosphor under near‐UV light as well as under visible light excitation and could be used for white LED and field emissive displays applications.

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“…The results showed that increasing the aspect ratio of ZWO nanorods elevated the separation rate of photoactivated electron-hole pairs. Saravanakumar et al prepared ZWO nanoparticles with the aid of different surfactants and investigated the catalytic activity toward the photodegradation of ciprofloxacin drug [8]. Wang and his coauthors reported a simple solvothermal procedure to prepare porous hydrangea-like ZnWO 4 microspheres.…”

Section: Introductionmentioning

confidence: 99%

Rational Design and Synthesis of ZnWO4 Nanorods Decorated with SnS Nanodots with Enhanced Visible-Light Photocatalytic Performance

Shan

Jia

2021

Catalysts

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Aiming to construct a direct Z-scheme binary heterostructure for efficient degradation of the organic dye Rhodamine B (RhB), ZnWO4 nanorods decorated with SnS nanodots were rationally designed and prepared via a facile two-step route. Morphological observation and structural study showed that ultra-fine SnS nanodots were anchored on the surface of ZnWO4 nanorods to form an intimate contact between the two components. Such a special structure provided SnS/ZnWO4 nanocomposites with significantly enhanced light harvesting capacity, revealed by the results of UV-vis diffuse reflection spectroscopy (DRS). Photoluminescence (PL) analysis in combination with electrochemical measurements demonstrated that the recombination of photoactivated charge carriers was efficiently inhibited and the transfer of photoactivated charge carriers was successfully achieved due to the introduction of SnS. The degradation rate over SnS/ZnWO4 nanocomposites reached a maximum value at SnS content of 9 wt%. The significantly enhanced photoactivity of SnS/ZnWO4 nanocomposites was imputed to the synergistic effect of the promoted light absorption ability and effective photogenerated charge carriers’ transfer and separation.

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Surfactants-assisted synthesis of ZnWO4 nanostructures: A view on photocatalysis, photoluminescence and electron density distribution analysis

Cited by 47 publications

References 34 publications

Reactive Dual Magnetron Sputtering: A Fast Method for Preparing Stoichiometric Microcrystalline ZnWO4 Thin Films

Reactive Dual Magnetron Sputtering: A Fast Method for Preparing Stoichiometric Microcrystalline ZnWO4 Thin Films

ZnWO₄:Eu³⁺ phosphor with intense blue LED excitation: photoluminescence and electron density distribution analysis

Rational Design and Synthesis of ZnWO4 Nanorods Decorated with SnS Nanodots with Enhanced Visible-Light Photocatalytic Performance

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Surfactants-assisted synthesis of ZnWO4 nanostructures: A view on photocatalysis, photoluminescence and electron density distribution analysis

Cited by 47 publications

References 34 publications

Reactive Dual Magnetron Sputtering: A Fast Method for Preparing Stoichiometric Microcrystalline ZnWO4 Thin Films

Reactive Dual Magnetron Sputtering: A Fast Method for Preparing Stoichiometric Microcrystalline ZnWO4 Thin Films

ZnWO4:Eu3+ phosphor with intense blue LED excitation: photoluminescence and electron density distribution analysis

Rational Design and Synthesis of ZnWO4 Nanorods Decorated with SnS Nanodots with Enhanced Visible-Light Photocatalytic Performance

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ZnWO₄:Eu³⁺ phosphor with intense blue LED excitation: photoluminescence and electron density distribution analysis