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

Su, Chung-Yen; Lin, Hsuan Ching; Yang, Tsung Kun; Chang, Chong Hong; Lin, Chung Kwei

doi:10.2320/matertrans.m2009068

Cited by 10 publications

(4 citation statements)

References 21 publications

(19 reference statements)

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“…1-081-2262) phases. The nonstoichiometric WO 3-X such as W 5 O 14 and W 19 O 55 is widely used in application in nanomaterial [3]. It can be concluded that, increasing the reaction time in the reduction process could improve the reducibility of the WO 3 [7].…”

Section: Resultsmentioning

confidence: 99%

“…Tungsten oxide can exists in various phases for instance stoichiometric WO 2 , WO 3 , and nonstoichiometric WO 3-x (W 19 O 55 , W 18 O 49 , W 5 O 14 etc). The phase changes of tungsten oxide are influenced by reaction condition such as temperature [2]. Among the phases, non-stoichiometric particularly exhibits highly favorable properties for nanopowder application related in electrochromism, optics, catalysts and gas sensors [3].…”

Section: Introductionmentioning

confidence: 99%

“…The phase changes of tungsten oxide are influenced by reaction condition such as temperature [2]. Among the phases, non-stoichiometric particularly exhibits highly favorable properties for nanopowder application related in electrochromism, optics, catalysts and gas sensors [3].…”

Section: Introductionmentioning

confidence: 99%

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Influence of Cerium Additive on the Reduction Behaviour of Tungsten Oxide under Carbon Monoxide Atmosphere

Salleh

Saharuddin

Samsuri

et al. 2017

MSF

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The reduction of pure WO3 and Ce/WO3 has been studied by using temperature programmed reduction (TPR), X-ray diffraction (XRD), and FESEM analysis. The reduction behavior were examined by non-isothermal reduction up to 900 oC then continued with isothermal reduction at 900 oC for 45 min under (40% v/v) carbon monoxide in nitrogen (CO in N2) atmosphere. The TPR results shows that reduction peak of Ce/WO3 were shifts to lower temperature as compared with to the pure WO3. In addition, TPR results indicate that addition with ceria give better reducibility compared to pure WO3. Based on the characterization of the reduction products after hold 45 min using XRD, pure WO3 were completely converted to WO2 and W metal phases. While, after addition of Ce to the WO3, the reduction was enhanced to W phases and some suboxide W5O14 and W3O5 with no WO2 phase remained and carbide observed. This is associated to the formation of alloy complex Ce2WO6 which gave remarkable effect to the reduction.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Influence of Cerium Additive on the Reduction Behaviour of Tungsten Oxide under Carbon Monoxide Atmosphere

Salleh

Saharuddin

Samsuri

et al. 2017

MSF

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“…Tungsten oxides can exhibit in various phases for instance stoichiometric WO 2 , WO 3 , and non-stoichiometric WO 3-x (W 19 O 55 , W 5 O 14 etc). The phases change of tungsten oxide with respect to temperature [3]. Venables and Brown [4] reported reduction WO 3 with hydrogen and carbon.…”

Section: Introductionmentioning

confidence: 98%

Reduction Behaviour of WO<sub>3</sub> to W under Carbon Monoxide Atmosphere

Salleh

Saharuddin

Samsuri

et al. 2016

MSF

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The reduction behaviour of tungsten oxide has been studied by using temperature programmed reduction (TPR) and X-ray diffraction (XRD). The reduction behavior were examine by nonisothermal reduction up to 900 oC then continued with isothermal reduction at 900 oC for 45 min time under (40% v/v) carbon monoxide in nitrogen (CO in N2) atmosphere. The TPR signal clearly shows one peak attributed to formation of suboxide W18O49 (more) and WO2 (less) observed at 80 min. The reduction product was investigated by varying the holding reaction time. Based on the characterization of the reduction products by using XRD, it was found that, nonisothermal reduction of WO3 at temperature 900 oC partially converted to some W18O49 and WO2 phases. However, after increased the reaction holding time for 45 min, WO3 phases disappeared and converted to WO2 and W metal phases. It is obviously shows that by hold the reduction time could improve the reducibility of the sample oxide. Furthermore, it is suggested that reduction by using CO as reducing agent follows the consecutives steps WO3 → WO2.92 → W18O49 → WO2 → W.

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Multifunctional poly(N-methylpyrrole)/nano-oxide composites: Optoelectronic, charge transport and antibacterial properties

Özkazanç

Menkuer

Gündoğdu

et al. 2020

Polymer

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

Cited by 10 publications

References 21 publications

Influence of Cerium Additive on the Reduction Behaviour of Tungsten Oxide under Carbon Monoxide Atmosphere

Influence of Cerium Additive on the Reduction Behaviour of Tungsten Oxide under Carbon Monoxide Atmosphere

Reduction Behaviour of WO<sub>3</sub> to W under Carbon Monoxide Atmosphere

Multifunctional poly(N-methylpyrrole)/nano-oxide composites: Optoelectronic, charge transport and antibacterial properties

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