Phonon characteristics and intrinsic properties of single phase ZnWO4 ceramic

Mengting, Liu; Xiao, En-Cai; Lv, Jiqing; Qi, Zeming; Yue, Zhenxing; Chen, Ying; Chen, Guohua; Shi, Feng

doi:10.1007/s10854-020-03172-6

Cited by 10 publications

(3 citation statements)

References 26 publications

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“…Zn(Cy) 2 and thermally treated at 500 • C (Figure S8). The analysis evidences the simultaneous presence of bands at 791, 693 and 257 cm −1 relative to WO 3 and several bands at 897, 402, 320 and 185 cm −1 corresponding to the ZnWO 4 wolframite phase [39]. Note that the redshift of bands compared to the positions reported in the literature at room temperature are due to the effect of temperature.…”

Section: Transformation Of Zno@wo3 Nanocomposite Into Znwo4 @Wo3supporting

confidence: 63%

Nano-Structuration of WO3 Nanoleaves by Localized Hydrolysis of an Organometallic Zn Precursor: Application to Photocatalytic NO2 Abatement

et al. 2022

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WO3 is a known photocatalytic metal oxide frequently studied for its depollution properties. However, it suffers from a high recombination rate of the photogenerated electron/holes pair that is detrimental to its performance. In this paper, we present a new chemical method to decorate WO3 nanoleaves (NLs) with a complementary metal oxide (ZnWO4) in order to improve the photocatalytic performance of the composite material for the abatement of 400 ppb NO2 under mild UV exposure. Our strategy was to synthesize WO3·2H2O nanoleaves, then, to expose them, in water-free organic solution, to an organometallic precursor of Zn(Cy)2. A structural water molecule from WO3·2H2O spontaneously decomposes Zn(Cy)2 and induces the formation of the ZnO@WO3·H2O nanocomposite. The material was characterized by electronic microscopy (SEM, TEM), TGA, XRD, Raman and solid NMR spectroscopies. A simple thermal treatment under air at 500 °C affords the ZnWO4@WO3 nanocomposite. The resulting material, additionally decorated with 1% wt. Au, presents a remarkable increase (+166%) in the photocatalytic abatement of NO2 under UV compared to the pristine WO3 NLs. This synthesis method paves the way to the versatile preparation of a wide range of MOx@WO3 nanocomposites (MOx = metal oxide).

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Section: Transformation Of Zno@wo3 Nanocomposite Into Znwo4 @Wo3supporting

confidence: 63%

Nano-Structuration of WO3 Nanoleaves by Localized Hydrolysis of an Organometallic Zn Precursor: Application to Photocatalytic NO2 Abatement

et al. 2022

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“…The solid‐state reaction method is to directly mix and grind metal salts or metal oxides in a certain proportion and then calcine them at high temperatures. Liu et al [ 31 ] synthesized microwave dielectric ceramics ZnWO 4 with monoclinic wolframite structure by the traditional solid‐state method, which had P2/c space group and no secondary phase. Li et al [ 32 ] prepared two series of ZnWO 4 :RE 3+ and Li + (RE = Sm, Eu) phosphors by solid‐state reaction sintering at 800 °C.…”

Section: Synthesis Methods Of Znwo4mentioning

confidence: 99%

Synthesis Methods and Applications of Semiconductor Material ZnWO₄ with Multifunctions and Multiconstructions

Wang

et al. 2021

Energy Tech

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At present, nanostructures with excellent morphology have become a research hotspot. With the deepening of research and the rapid development of nanotechnology, nanosemiconductors have also made remarkable progress. In recent years, ZnWO4 in metal tungstates has been widely used in many fields, which is mainly due to its high crystal density, short radiation length, excellent optical properties, good radiation damage resistance, and non‐liquefaction. Therefore, herein, the synthesis methods and applications of ZnWO4 semiconductor materials in recent years are reviewed. First, the crystal structure and characteristics of ZnWO4 are described, and then the latest research progress of ZnWO4 semiconductor materials is summarized. The synthesis methods and contributions to photocatalysis, sensors, electronic materials, and luminescent materials are highlighted. The characteristics of ZnWO4 nanoarrays and their applications in supercapacitors are particularly emphasized, which provide a reference for the development of multifunctional nanoarrays. Finally, the challenges and countermeasures of ZnWO4 semiconductor materials are summarized and prospected. In a word, a new idea and strategy to design and assemble new types of ZnWO4 nanomaterials with multiconstructional systems and multifunctional properties for their practical applications is provided.

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“…In order to analyze this behavior, we first introduce the IR optical properties of bulk ZnWO 4 . According to IR reflectance spectra [54] and Raman spectroscopy investigations, [55] ZnWO 4 has two Reststrahlen bands (RB) arising from the material's optical phonons response. We now focus our attention on the band between 880 and 910 cm −1 (≈11 µm wavelength), corresponding to the bending and stretching vibrations of the ZnWO bond; and on the band between 705 and 756 cm −1 (centered at 13.5 µm) corresponding to the bending and stretching vibrations of the WO bond.…”

Section: Passive Properties: Mir Metamaterials With Strong Polarizati...mentioning

confidence: 99%

Surprising Eutectics: Enhanced Properties of ZnO‐ZnWO₄ from Visible to MIR

et al. 2022

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Zinc oxide‐zinc tungstate (ZnO‐ZnWO4 ) is a self‐organized eutectic composite consisting of parallel ZnO thin layers (lamellae) embedded in a dielectric ZnWO4 matrix. The electromagnetic behavior of composite materials is affected not only by the properties of single constituent materials but also by their reciprocal geometrical micro‐/nano‐structurization, as in the case of ZnO‐ZnWO4. The light interacting with microscopic structural features in the composite material provides new optical properties, which overcome the possibilities offered by the constituent materials. Here remarkable active and passive polarization control of this composite over various wavelength ranges are shown; these properties are based on the crystal orientation of ZnO with respect to the biaxiality of the ZnWO4 matrix. In the visible range, polarization‐dependent polarized luminescence occurs for blue light emitted by ZnO. Moreover, it is reported on the enhancement of the second harmonic generation of the composite with respect to its constituents, due to the phase matching condition. Finally, in the medium infrared spectral region, the composite behaves as a metamaterial with strong polarization dependence.

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Phonon characteristics and intrinsic properties of single phase ZnWO4 ceramic

Cited by 10 publications

References 26 publications

Nano-Structuration of WO3 Nanoleaves by Localized Hydrolysis of an Organometallic Zn Precursor: Application to Photocatalytic NO2 Abatement

Nano-Structuration of WO3 Nanoleaves by Localized Hydrolysis of an Organometallic Zn Precursor: Application to Photocatalytic NO2 Abatement

Synthesis Methods and Applications of Semiconductor Material ZnWO₄ with Multifunctions and Multiconstructions

Surprising Eutectics: Enhanced Properties of ZnO‐ZnWO₄ from Visible to MIR

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Phonon characteristics and intrinsic properties of single phase ZnWO4 ceramic

Cited by 10 publications

References 26 publications

Nano-Structuration of WO3 Nanoleaves by Localized Hydrolysis of an Organometallic Zn Precursor: Application to Photocatalytic NO2 Abatement

Nano-Structuration of WO3 Nanoleaves by Localized Hydrolysis of an Organometallic Zn Precursor: Application to Photocatalytic NO2 Abatement

Synthesis Methods and Applications of Semiconductor Material ZnWO4 with Multifunctions and Multiconstructions

Surprising Eutectics: Enhanced Properties of ZnO‐ZnWO4 from Visible to MIR

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Synthesis Methods and Applications of Semiconductor Material ZnWO₄ with Multifunctions and Multiconstructions

Surprising Eutectics: Enhanced Properties of ZnO‐ZnWO₄ from Visible to MIR