Synthesis of NiWO4 nano-particles in low-temperature molten salt medium

Song, Zuwei; Ma, Junfeng; Sun, Hui; Wang, Wei; Sun, Yong; Sun, Lijuan; Liu, Zhengsen; Gao, Chang

doi:10.1016/j.ceramint.2009.03.010

Cited by 54 publications

(15 citation statements)

References 20 publications

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“…For the NiWO 4 sample, 100 nm shift to a lower wavelength was observed as compared to the same material synthesized by the molten salt method [20]. Four bands observed from the NiWO 4 sample at both UV and visible range (Figure 5(b)) are due to the oxidation state of the cations [37].…”

Section: Resultsmentioning

confidence: 99%

“…BaWO 4 in the rhombic shape was prepared by a molten flux reaction using alkali metal nitrates as the reaction media [19]. Nickel tungstate (NiWO 4 ) nanoparticles were successfully synthesized at low temperatures by a molten salt method at a temperature as low as 270°C, where the mixture of NaNO 3 and LiNO 3 was used as the molten salt medium with 6:1 mass ratio of the salt to the NiWO 4 precursor [20]. Generally, these methods require expensive and sophisticated equipment, high temperatures with long processing times, expensive precursors and high consumption of electric energy.…”

Section: Introductionmentioning

confidence: 99%

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Structural and optical characterization of metal tungstates (MWO4; M=Ni, Ba, Bi) synthesized by a sucrose-templated method

Zawawi

Yahya

Hassan

et al. 2013

Chemistry Central Journal

133

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BackgroundMetal tungstates have attracted much attention due to their interesting structural and photoluminescence properties. Depending on the size of the bivalent cation present, the metal tungstates will adopt structures with different phases. In this work, three different phases of metal tungstates MWO4 (M= Ba, Ni and Bi) were synthesized via the sucrose templated method.ResultsThe powders of BaWO4 (tetragonal), NiWO4 (monoclinic) and Bi2WO6 (orthorhombic) formed after calcination temperatures of 750, 650 and 600°C for 4 h respectively are found to be crystalline and exist in their pure phase. Based on Scherrer estimation, their crystallite size are of nanosized. BET results showed NiWO4 has the highest surface area. BaWO4 exhibited less Raman vibrations than the NiWO4 because of the increased lattice symmetry but Bi2WO6 showed almost the same Raman vibrations as BaWO4. From the UV-vis spectra, the band gap transition of the metal tungstates are of the order of BaWO4 > Bi2WO6 > NiWO4. Broad blue-green emission peaks were detected in photoluminescence spectra and the results showed the great dependence on morphology, crystallinity and size of the metal tungstates.ConclusionThree different phases of metal tungstates of BaWO4 (scheelite), NiWO4 (wolframite) and Bi2WO6 (perovskite layer) in their pure phase were successfully prepared by the simple and economical sucrose-templated method. The highest surface area is exhibited by NiWO4 while largest band gap is shown by BaWO4. These materials showed promising optical properties.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Structural and optical characterization of metal tungstates (MWO4; M=Ni, Ba, Bi) synthesized by a sucrose-templated method

Zawawi

Yahya

Hassan

et al. 2013

Chemistry Central Journal

133

View full text Add to dashboard Cite

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“…2F shows diffraction peaks accountable for the (010), (110), (011), (111), (002), (200) planes, and so on, which match with that of crystalline NiWO 4 (JCPDS file no. 15-0755) 28 29 .…”

Section: Resultsmentioning

confidence: 99%

Hydrothermal synthesis of NiWO4 crystals for high performance non-enzymatic glucose biosensors

Manickam

Veeramani

Chen

et al. 2016

Sci Rep

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A facile hydrothermal route for the synthesis of ordered NiWO4 nanocrystals, which show promising applications as high performance non-enzymatic glucose sensor is reported. The NiWO4-modified electrodes showed excellent sensitivity (269.6 μA mM−1 cm−2) and low detection limit (0.18 μM) for detection of glucose with desirable selectivity, stability, and tolerance to interference, rendering their prospective applications as cost-effective, enzyme-free glucose sensors.

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“…The occurrence of absorption in the UV region is mainly due to excitation from O2p to Wt2g in the (WO4 2-) group and the peak appeared in the visible region is due to charge transfer of oxygen 2p atom to one of the empty 5d orbital of tungsten. The broad absorption occurred at the region from 250-400nm is due to small crystal size which in turn causes a strong quantum confinement effect on electron transition in nanocrystals [21]. .considerable shift of active modes at lower frequencies.…”

Section: Synthesis Of Niwo4 Nanostructuresmentioning

confidence: 99%

Tuning the non-linear optical absorption properties of Eu3+-doped NiWO4 nanostructures

Karthika

Sharath

Flower

et al. 2021

J Mater Sci: Mater Electron

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NiWO4 nanostructures doped with different ratios of Eu 3+ have been prepared by a chemical precipitation method. The influence of Eu 3+ on NiWO4 nanostructures were characterized using X-ray diffraction (XRD), UV-visible diffuse reflectance spectra, scanning electron microscopy (SEM) and Raman. XRD patterns display that the samples crystallize to monoclinic wolframite structure. SEM images reveal that the particles are well uniformly dispersed with average particle size lies around 40-50nm. Third-order nonlinear optical properties were studied by a Z-scan technique at 532 nm using continuous wave diode pumped Nd:YAG laser. Open and closed aperture results reveal the nanostructures to possess reverse saturation absorption and negative nonlinear refraction. The calculated absorption coefficients (β), imaginary part of third-order susceptibilities Imχ (3) are in the order of 10 -6 (cm/W) and 10 -7 esu. These results indicated that the synthesized nanostructures could be promising materials for optical device applications.

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Synthesis of NiWO4 nano-particles in low-temperature molten salt medium

Cited by 54 publications

References 20 publications

Structural and optical characterization of metal tungstates (MWO4; M=Ni, Ba, Bi) synthesized by a sucrose-templated method

Structural and optical characterization of metal tungstates (MWO4; M=Ni, Ba, Bi) synthesized by a sucrose-templated method

Hydrothermal synthesis of NiWO4 crystals for high performance non-enzymatic glucose biosensors

Tuning the non-linear optical absorption properties of Eu3+-doped NiWO4 nanostructures

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