Investigations of Nonstoichiometric Tungsten Oxide Nanoparticles

Frey, Gitti L.; Rothschild, A.; Sloan, Jeremy; Rosentsveig, Rita; Popovitz‐Biro, Ronit; Tenne, Reshef

doi:10.1006/jssc.2001.9319

Cited by 176 publications

(147 citation statements)

References 30 publications

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“…Figure 8 shows a snapshot image of stoichiometric (right, yellowish color) and nonstoichiometric (left, blue color) nanocrystalline tungsten oxide powders. 12) In the present study, we have demonstrated that nanocrystalline tungsten oxide powders can be prepared by a modified plasma arc gas condensation technique with a pressure much higher than the conventional gas condensation method. Significant increase in the powder production rate can also be noticed.…”

Section: The Effect Of Oxygen Partial Pressurementioning

confidence: 71%

A Modified Plasma Arc Gas Condensation Technique to Synthesize Nanocrystalline Tungsten Oxide Powders

Lin

Cheng

2005

Mater. Trans.

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In the present study, nanocrystalline tungsten oxide powders were prepared by a modified plasma arc gas condensation technique where a gas nozzle was introduced to provide blowing gas. With the aid of the blowing gases, nanocrystalline tungsten oxide powders can be prepared under various chamber pressures ranged from 4.9 to 101.3 kPa. The mean grain size and powder production rate of the as-prepared nanocrystalline WO 3 powders increased with increasing chamber pressure. For an increasing chamber pressure from 4.9 to 101.3 kPa, asignificant increase in powder production rate from 0.374 to 13.658 g/h can be noticed, while the mean grain size only enlarged acceptably from 5.9 to 15.7 nm. Meanwhile, by controlling the partial oxygen pressure of the mixed gas, nanocrystalline blue tungsten oxide powders can be prepared successfully. The blowing mixed gas from the nozzle not only suppressed the nucleation and growth for powders from the gas phase, but can be used to prepare stoichiometric or nonstoichiometric tungsten oxide powders.

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Section: The Effect Of Oxygen Partial Pressurementioning

confidence: 71%

A Modified Plasma Arc Gas Condensation Technique to Synthesize Nanocrystalline Tungsten Oxide Powders

Lin

Cheng

2005

Mater. Trans.

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“…In this paper, we discuss matters related to the growth of WO x nanorods formed on a tungsten substrate from intermediate tungsten oxides. Intermediate tungsten oxides of a general formula WO x where x is between 2 and 3 are known to produce high-aspect rods depending on the growth conditions [5][6][7][8]. We detected epitaxial growth of nanorods on single tungsten crystal [9].…”

Section: Introductionmentioning

confidence: 90%

Epitaxial growth of WO_x nanorods on single‐crystal tungsten substrate

Shingaya

Nakayama

2008

Elect Comm in Japan

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SUMMARYNanorods of substoichiometric tungsten oxide (WO x ) were grown on single-crystal tungsten substrate. The grown nanorods were investigated with scanning electron microscopy and atomic force microscopy. WO x nanorods were grown on W(001) in accordance with epitaxial relationship between WO 3 crystals and W(001) surface. The results indicate that the WO 3 crystals formed at the initial stage act as the nuclei of WO x nanorods. Nanorod growth of certain epitaxial directions can be selectively enhanced by choosing growth methods or choosing suitable crystallographic orientation of substrate surface.

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“…Meanwhile, the weak band at 613 cm -1 has been ascribed to the lattice vibration of hydrated WO3(H2O)x [19]. Other sharp but weak Raman bands appearing between 200 and 650 cm -1 have previously been ascribed to modes in the substoichiometric WO3-x [20]. Bands below 235 cm -1 in wavenumber can be assigned as low-frequency temperaturedependent phonons in the material [21].…”

Section: Characterization Of the Filmsmentioning

confidence: 97%

Synthesis of superhydrophobic polymer/tungsten (VI) oxide nanocomposite thin films

et al. 2016

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A method is presented to enable the preparation of superhydrophobic polymer/tungsten (VI) oxide (WO3) nanocomposite coatings on glass substrates. WO3 nanoparticles were incorporated via the swell-encapsulation-shrink method into superhydrophobic silicone polymer films deposited on glass via aerosol-assisted chemical vapour deposition (AACVD) to produce the novel nanocomposite films. The technique overcomes the limitations of previous methods for nanoparticle incorporation to provide a synthetic route to previously unattainable materials. The nanocomposite films retain the properties of the superhydrophobic polymer while the presence of the nanoparticles is clearly evident. As such, the films have a range of potential applications including high surface area photocatalysis and self-cleaning photochromic or electrochromic coatings. The two-stage synthesis is shown to be flexible and suggests great scope for producing any number of future novel materials. The thin films were characterized using scanning electron microscopy (SEM), energy-dispersive X-ray (EDX) analysis, X-ray photoelectron spectroscopy (XPS), infra-red (FTIR) spectroscopy, X-ray diffractometry (XRD) and water droplet contact angle measurements. KEYWORDS

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Investigations of Nonstoichiometric Tungsten Oxide Nanoparticles

Cited by 176 publications

References 30 publications

A Modified Plasma Arc Gas Condensation Technique to Synthesize Nanocrystalline Tungsten Oxide Powders

A Modified Plasma Arc Gas Condensation Technique to Synthesize Nanocrystalline Tungsten Oxide Powders

Epitaxial growth of WO_x nanorods on single‐crystal tungsten substrate

Synthesis of superhydrophobic polymer/tungsten (VI) oxide nanocomposite thin films

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Investigations of Nonstoichiometric Tungsten Oxide Nanoparticles

Cited by 176 publications

References 30 publications

A Modified Plasma Arc Gas Condensation Technique to Synthesize Nanocrystalline Tungsten Oxide Powders

A Modified Plasma Arc Gas Condensation Technique to Synthesize Nanocrystalline Tungsten Oxide Powders

Epitaxial growth of WOx nanorods on single‐crystal tungsten substrate

Synthesis of superhydrophobic polymer/tungsten (VI) oxide nanocomposite thin films

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Epitaxial growth of WO_x nanorods on single‐crystal tungsten substrate