Comparison of the morphology and structure of WO3 nanomaterials synthesized by a sol-gel method followed by calcination or hydrothermal treatment

Susanti, Diah; Haryo, N. Stefanus; Nisfu, Hasnan; Nugroho, Eko Prasetio; Purwaningsih, Hariyati; Kusuma, George Endri; Shih, Shao‐Ju

doi:10.1007/s11705-012-1215-3

Cited by 26 publications

(8 citation statements)

References 24 publications

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“…As a result, the polymeric organic net formed by the esterification reaction decreases the ion segregation 10 . Many researchers have studied powder preparation of WO 3 by sol-gel method [11][12][13][14][15] . Han et al 15 reported that nanometric WO 3 powders with uniform size and spherical shape can be synthesized in the presence of oxalic acid and cetyltrimethyl ammonium bromide as the complexing and surface active agents, respectively.…”

Section: Introductionmentioning

confidence: 99%

Morphological Characterization of Tungsten Trioxide Nanopowders Synthesized by Sol-Gel Modified Pechini's Method

Ghasemi

Jafari

2017

Mat. Res.

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Sol-gel modified Pechini's method was used to prepare WO 3 nanopowders using dicarboxylic acid and polyethylene glycol as the chelating agent and polymeric source, respectively. WO 3 powders were first prepared by calcination of resin precursor at 550ºC under various initial concentrations of metal ion (12.5-50 mmol), acid (125-500 mmol), a complexing agent (32-262 mmol), and polyethylene glycol (1-16.5 mmol) in the air atmosphere. The products were characterized using X-ray powder diffraction, field emission scanning electron microscopy, and energy dispersive spectroscopy. The results revealed that the WO 3 nanopowders prepared with different amounts of chelating agent and polyethylene glycol, crystallized in monoclinic phase. The nanopowders were impurity-free due to the presence of the complexing agent and polyethylene glycol as carbon sources. Morphological evolution indicated that the nanopowders evolved from rod-like to regular and spherical shapes, depending on complexing agent and polyethylene glycol amounts. Nanopowders with an average particle size of approximately 58 nm and a narrow size distribution were obtained.

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Section: Introductionmentioning

confidence: 99%

Morphological Characterization of Tungsten Trioxide Nanopowders Synthesized by Sol-Gel Modified Pechini's Method

Ghasemi

Jafari

2017

Mat. Res.

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“…each tungsten atom is bonded with six oxygen atoms, three of them shared with other adjacent molecules (Figure 5b and d). The obtained results regarding structural elucidation from XRD data have already been reported in the literature [35]. The summary of details of space group, crystal system, density, lattice parameters, atomic coordinates, bond angles and bond lengths are given in Table 1.…”

Section: Structural Analysis By Xrdmentioning

confidence: 57%

A novel study of tungsten oxide nanocrystallites as fuel additive for diesel oil

Jamil

2021

Journal of Taibah University for Science

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In this paper, a basic solvothermal synthesis using sodium tungstate as a precursor is reported to prepare tungsten oxide (WO 3 ) particles. XRD data confirmed the highly crystalline nature. The broad peaks of XRD patterns estimated the nanocrystallites of WO 3 . The average crystallite size as was 95 nm. Scanning electron microscopy showed the morphologically cube-like particles with aggregation that was converted to larger brick-like particle of WO 3 after calcination. WO 3 was used as fuel additive in diesel oil. Fire and flash points of diesel oil were enhanced to 49°C and 54°C respectively. The calorific value was increased up to 36580 Jg −1 . Thus fuel efficiency was enhanced by use of WO 3 as an additive. The use of different concentrations of WO 3 (20, 40, 60, 80 ppm) as fuel additive has been also explored in this paper. The observed additive properties of WO 3 suggested the potential applications of such metal oxides.

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“…Analogous behavior and results were obtained by Wang et al(2003) , they found that the crystallite sizes increased with increasing calcination temperatures from 350°C, 450°C, 550°C to 650°C the crystalline sizes were 9.3, 16.4, 17.1 and 30 nm , respectively. On the other hand, Susanti et al(2012) found that the crystalline sizes were 7.31, 9.92, 20.4 and 28.36 nm when the calcination temperatures increased from 300°C, 400°C, 500°C to 600°C.…”

Section: -Results and Discussionmentioning

confidence: 94%

Synthesis and Characterization of Nanostructured Tungsten Trioxide (WO3) Thin Films

Mohamed

Ali

Nageib

et al. 2020

Aswan University Journal of Environmental Studies

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Tungsten trioxide (WO 3) has attracted great attention due to its promising and wonderful properties. In this study, the influences of calcined temperature on the structural, morphological and optical properties of WO 3 were investigated. Sodium tungstate dehydrates (Na2WO4.2H2O, 99.9%) powder was used as starting precursor. A sol-gel spin coating technique was used to synthesize pure WO3 thin films. The as-deposited films have been annealed at 300 o C, 400 o C, 500 o C, 550 o C and 600 o C for 2 hours. The structural properties of thin film samples have been studied by the X-ray diffractometer (XRD) with Cu Kα radiation of wavelength 1.542 Å. X-ray diffraction data has been used to find out changes in the crystallite size and to determine the phases present in the films. Field emission-scanning electron microscopy (FE-SEM) has been performed to investigate the surface morphology of the prepared samples. The optical band gap energy of the thin films has been investigated and analyzed using UV-Vis spectrophotometer equipped with an integrating sphere and a Spectral reflectance standard. The absorbance of the films was measured in a wavelength range of 190-2500 nm. From the results it was found that the characterized peaks were associated to the crystalline planes of the monoclinic phase of WO3. The crystallite sizes increased with increasing calcination temperatures. It was observed that the WO3 had a sphere-like structure composed of numerous nanoparticles. The absorbance spectra show that the there is a red shift in the absorption edge as the calcined temperature increases The optical energy gap was decreased as the calcined temperature increased. The estimated energy gap values for the thin film sample under consideration was about 2.95, 2.58, and 2.023 for sampled calcined at 400 0 C 500 0 C, and 550 0 C respectively.

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Comparison of the morphology and structure of WO3 nanomaterials synthesized by a sol-gel method followed by calcination or hydrothermal treatment

Cited by 26 publications

References 24 publications

Morphological Characterization of Tungsten Trioxide Nanopowders Synthesized by Sol-Gel Modified Pechini's Method

Morphological Characterization of Tungsten Trioxide Nanopowders Synthesized by Sol-Gel Modified Pechini's Method

A novel study of tungsten oxide nanocrystallites as fuel additive for diesel oil

Synthesis and Characterization of Nanostructured Tungsten Trioxide (WO3) Thin Films

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