Synthesis of WO 3 microfibers and their optical properties

Meng, Lanxiang; Zhao, Zhiqiang; Zhang, Min; Zhu, Xiaorui; Geng, Xin; Liu, Jiangfeng; Xia, Yanjie; Wang, Zhongchang

doi:10.1016/j.ceramint.2017.02.134

Cited by 19 publications

(8 citation statements)

References 35 publications

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“…Decrease in magnetic moment has been observed in the samples annealed above 500 C which proves the fact that the magnetism in WO 3 originates from oxygen vacancies. 61 Filling up of oxygen vacancies enormously degrades the magnetic ordering of these compounds. 62,63 Nguyen Hoa Hong also reported the assumption that magnetism in HfO 2 thin lms originates from defects and/or oxygen vacancies.…”

Section: Magnetic Studiesmentioning

confidence: 99%

Influence of defect structure on colour tunability and magneto optical behaviour of WO₃ nanoforms

Kriti

Kaur

et al. 2019

RSC Adv.

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The present study reports the impact of thermal annealing on the structural, optical and magnetic properties of WO 3 nanostructures, synthesized using an acid precipitation method by, employing various spectroscopic and magnetic measurements. The X-ray diffraction and Raman measurements confirmed the orthorhombic structure of as dried WO 3 $H 2 O and monoclinic structure of WO 3 nanopowders annealed at or above 500 C. The morphological characterization shows the formation of different microstructures like nanosheets, nanoplatelets and nanocuboids in the micro-scale with the variation of annealing temperatures. The optical band gap has been calculated using the Kubelka-Munk function. The room temperature photoluminescence (PL) spectra recorded at different excitation wavelengths show intense near ultraviolet (NUV) emission which might be due to the presence of localized states associated with oxygen vacancies, and the surface states in the conduction band. The emissions in visible region correspond to the structural defects such as oxygen vacancies present within the band gap and band to band transitions. The spectral chromaticity colour coordinates indicate that the light emitted from the prepared samples shows shift from violet to red region with the change of excitation wavelength. Magnetic measurements show decrease in room temperature ferromagnetism (FM) with annealing temperature. The X-ray absorption spectroscopy (XAS) measurements at O K-edge show the significant change in the W-O hybridizations. The decrease in PL intensity and ferromagnetic ordering with increase in annealing temperatures are directly correlated with the filling up of oxygen vacancies in the samples. The oxygen vacancies based F-Center exchange model is discussed to understand the origin of FM in WO 3 nanostructures.

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Section: Magnetic Studiesmentioning

confidence: 99%

Influence of defect structure on colour tunability and magneto optical behaviour of WO₃ nanoforms

Kriti

Kaur

et al. 2019

RSC Adv.

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“…Photochromic (PC) materials have drawn much attention due to their potential applications in 3D information storage, optical switches, and optical anti-fake labels. [1][2][3][4][5][6] PC reaction can be reversibly transformed by alternating visible light or thermal stimulation and light stimulus. [7][8][9] Additionally, PC materials doped with luminescence activators possess both PC and emission modulation behaviors in one single material.…”

Section: Introductionmentioning

confidence: 99%

“…The photoluminescence of Yb 3+ /Er 3+ -codoped BaTiO 3 thin films and Pr 3+modified 0.93NBT-0.07BaTiO 3 ceramics is tuned by an in situ electric field. 21,22 The luminescence intensity of Eu 3+ -doped 0.94NBT-0.06BaTiO 3 and Pr 3+ -doped Ba 0.85 Ca 0.15 Ti 0.90 Zr 0.10 O 3 ferroelectrics is enhanced by application of an electric field. 23,24 Ferroelectric material Na 0.5 Bi 0.5 TiO 3 (NBT), a typical perovskite ABO 3 structure of environment-friendly lead-free piezoelectric material, has been extensively studied owing to its excellent piezoelectric and ferroelectric performances.…”

Section: Introductionmentioning

confidence: 99%

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The upconversion luminescence modulation and its enhancement in Er³⁺‐doped Na_0.5Bi_0.5TiO₃ based on photochromic reaction

Luo

Zhang

et al. 2018

J Am Ceram Soc

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A large and reversible upconversion (UC) luminescence modulation has been found in the Na0.498Bi0.498TiO3:0.002Er (NBT:0.002Er) based on the photochromic reaction. The dependence of luminescence modulation of the ceramics on the wavelength of irradiation light and sintering temperature was investigated. It was found that the optimized sintering temperature and irradiation wavelength were 1130°C and 405 nm, respectively. The highest ΔRt (defined as: ΔRt = (R0 – Rt)/R0×100(%), where R0 and Rt are the initial emission intensity and that after different irradiation time, respectively) value of 44.9% was obtained for the ceramics sintered at 1130°C after irradiation at 405 nm. More importantly, for the poled ceramics, ΔRt value was promoted to a high value of 75.5%, which was 168% of that of the unpoled ones. The mechanism of luminescence modulation and its enhancement via electric field poling were discussed. This study demonstrated that electric field poling was an effective strategy to enhance the PC reaction in the NBT ceramics.

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“…Tungsten trioxide (WO 3 ), as an important n -type semiconductor metal oxide with a wide band gap of 2.6~3.0 eV [1], is showing promising applications in a wide number of novel products, including photocatalytic [2], electrochromic devices [3], dye-sensitized solar cells [4], optical devices [5], field-emission displays [6], and gas sensors [7,8,9]. In particular, WO 3 is widely considered to be one of the most promising alternative candidate materials for the next-generation gas sensing devices [10,11].…”

Section: Introductionmentioning

confidence: 99%

Influence of Synthesis Conditions on Microstructure and NO2 Sensing Properties of WO3 Porous Films Synthesized by Non-Hydrolytic Sol–Gel Method

et al. 2018

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Nanostructured tungsten trioxide porous films were prepared by a non-hydrolytic sol–gel method following the inorganic route in which ethanol and PEG were used as the oxygen-donor and structure-directing reagent, respectively. The effects of aging time of the precursor solution, PEG content, and calcination temperature on the structure, morphology, and NO2 sensing properties of WO3 films were systematically investigated by using the techniques of X-ray diffraction, field emission scanning electron microscopy, transmission electron microscopy, and gas sensing measurements. The results demonstrated that a series of WO3 films with different microstructures could be obtained by manipulating the synthesis parameters. Furthermore, a suitable synthesis condition of WO3 films for NO2 sensing application was determined.

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Synthesis of WO 3 microfibers and their optical properties

Cited by 19 publications

References 35 publications

Influence of defect structure on colour tunability and magneto optical behaviour of WO₃ nanoforms

Influence of defect structure on colour tunability and magneto optical behaviour of WO₃ nanoforms

The upconversion luminescence modulation and its enhancement in Er³⁺‐doped Na_0.5Bi_0.5TiO₃ based on photochromic reaction

Influence of Synthesis Conditions on Microstructure and NO2 Sensing Properties of WO3 Porous Films Synthesized by Non-Hydrolytic Sol–Gel Method

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Synthesis of WO 3 microfibers and their optical properties

Cited by 19 publications

References 35 publications

Influence of defect structure on colour tunability and magneto optical behaviour of WO3 nanoforms

Influence of defect structure on colour tunability and magneto optical behaviour of WO3 nanoforms

The upconversion luminescence modulation and its enhancement in Er3+‐doped Na0.5Bi0.5TiO3 based on photochromic reaction

Influence of Synthesis Conditions on Microstructure and NO2 Sensing Properties of WO3 Porous Films Synthesized by Non-Hydrolytic Sol–Gel Method

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Product

Resources

About

Influence of defect structure on colour tunability and magneto optical behaviour of WO₃ nanoforms

Influence of defect structure on colour tunability and magneto optical behaviour of WO₃ nanoforms

The upconversion luminescence modulation and its enhancement in Er³⁺‐doped Na_0.5Bi_0.5TiO₃ based on photochromic reaction