Oxygen partial pressure effect on the preparation of nanocrystalline tungsten oxide powders by a plasma arc gas condensation technique

Su, Chung-Yen; Lin, Chung Kwei; Yang, Tsung Kun; Lin, Hsuan Ching; Pan, C. T.

doi:10.1016/j.ijrmhm.2007.09.006

Cited by 21 publications

(12 citation statements)

References 18 publications

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“…2 partial pressure is changed. 9) Hence, the O 2 defects have a significant effect on the structures of the tungsten oxide nanopowders.…”

Section: Resultsmentioning

confidence: 99%

“…5) Hence, the relationship between the O 2 defects and properties of WO 3Àx nanomaterials has been extensively studied. [6][7][8] Many studies have focused on the preparation of nonstoichiometric WO 3Àx nanomaterials with various morphologies, such as nanopowders, 9) nanorods, 10) nanowires, 11) microtubes, 12) and nanorod bundles. 13) In these studies, controlling the O 2 contents during WO 3Àx nanomaterials synthesis is a major concern.…”

Section: Introductionmentioning

confidence: 99%

“…In our previous work, WO 3 nanopowders of high yields can be prepared by a modified plasma arc gas condensation technique, and WO 3Àx nanopowders could also be obtained by decreasing the O 2 content during the experimental process. 9) In addition to controlling the O 2 concentration within the chamber, an alternative way to prepare O 2 -deficient WO 3Àx nanomaterials is to partially replace the inert plasma gas Ar with a reductive gas, for instance, H 2 .…”

Section: Introductionmentioning

confidence: 99%

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Tungsten Oxide Nanopowders and Nanorods Prepared by a Modified Plasma Arc Gas Condensation Technique

Lin

Yang

et al. 2009

Mater. Trans.

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Tungsten oxide nanopowders and nanorods were synthesized by using a modified plasma arc gas condensation technique that involved the introduction of a mixed gas with controllable partial O2 pressure into a gas condensation system. Experimental results showed that yellow and blue tungsten oxide nanopowders, prepared under an Ar to O2 ratios of 1: 1 and 100: 1, exhibited a major WO3 phase and W19O55 phase, respectively. The nanopowders grew into W5O14-phase nanorods along the [001] direction when H2 was used as the reduction gas. [doi:10.2320/matertrans.M2009068

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“…2 partial pressure is changed. 9) Hence, the O 2 defects have a significant effect on the structures of the tungsten oxide nanopowders.…”

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Tungsten Oxide Nanopowders and Nanorods Prepared by a Modified Plasma Arc Gas Condensation Technique

Lin

Yang

et al. 2009

Mater. Trans.

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“…Many methods [7][8][9], such as vapor transport, template, and solution phase, are used to prepare nano-WO 3 [10][11][12][13]. However, the size and morphology of nano-WO 3 are not easily controlled with the use of currently available methods.…”

Section: Introductionmentioning

confidence: 99%

Preparation of WO3 nanorods with high specific surface area using double-walled carbon nanotubes as template

Yin

et al. 2015

Rare Met.

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The preparation of WO 3 nanorods by doublewalled carbon nanotube (DWCNT) template was investigated in this study. Owing to that the prepared H 2 WO 4 can be isolated by the homogenously dispersed DWCNT bundles and secondary accumulation can be avoided effectively, the growth of H 2 WO 4 can be restrained, and H 2 WO 4 nanorods with diameter of 10-50 nm can be prepared. After calcination of the prepared DWCNT/H 2 WO 4 composite in oxygen, WO 3 nanorods with diameter of 10-100 nm and high specific surface area of 16.4 m 2 Ág -1 can be obtained. It is concluded that the DWCNTs play an important role in the effective mediation of the morphology and size of nano-WO 3 .

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“…With the progress in nanotechnology, nanoparticles have attracted increasing attention to their unique properties [10]. One of the recently investigated methods for the simple preparation of nano-oxide composites that include molybdenum or tungsten atoms is the Pechini method [11,12].…”

Section: Introductionmentioning

confidence: 99%

Optimization of the Synthesis of Nanostructured Tungsten-Molybdenum Bimetallic Oxide

et al. 2012

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nanoparticles were prepared through the Pechini process and were characterized using X-ray diffraction (XRD), transmission electron microscopy (TEM), FT-IR spectrometer, and differential thermal analysis (TG-DSC) analyses. The polyesterification reaction, as the starting step, has a profound influence on the dispersion of the resulting nanoparticles. The molar ratios CA : TM = 2 and EG : CA = 1.5 are favorable for the preparation of nanoparticles having average particles size ranging from 2 to 9 nm. Meanwhile, the molar ratios CA : TM = 4 and EG : CA = 0.19 are favorable for the preparation of nanoparticles having an average particles size ranging from 11 to 29 nm. For the calcination step, increased calcination time (eight hours) at 500°C is advantageous for allowing the monometallic phases enough time to transform into the desired bimetallic phase.

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Oxygen partial pressure effect on the preparation of nanocrystalline tungsten oxide powders by a plasma arc gas condensation technique

Cited by 21 publications

References 18 publications

Tungsten Oxide Nanopowders and Nanorods Prepared by a Modified Plasma Arc Gas Condensation Technique

Tungsten Oxide Nanopowders and Nanorods Prepared by a Modified Plasma Arc Gas Condensation Technique

Preparation of WO3 nanorods with high specific surface area using double-walled carbon nanotubes as template

Optimization of the Synthesis of Nanostructured Tungsten-Molybdenum Bimetallic Oxide

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