Reduction-oxidation of V                         2                         O                         5                         -WO                         3                          nanostructured by ball milling and annealing: Their improved H                         2                         S gas sensing performance

Amogelang S. Bolokang; David E. Motaung

doi:10.1016/j.apsusc.2018.12.105

Reduction-oxidation of V ₂ O ₅ -WO ₃ nanostructured by ball milling and annealing: Their improved H ₂ S gas sensing performance

Amogelang S. Bolokang, David E. Motaung

Research output: Contribution to journal › Article › peer-review

27 Citations (Scopus)

Abstract

Nanocrystalline composite VO ₂ -WO ₃ powder was produced via mechanical milling (MM) and annealing. SEM images showed the formation of rod-shaped and hollow-shaped like structures surrounded by nanoparticles. Transmission electron microscopy and selected area electron diffraction analyses demonstrated that the nanorods are single crystalline. X-ray diffraction technique was used to determine the structural transformation of the powder after mechanical milling and annealing. The mechanism related to the formation of ceramic composite powder was discussed in detail. The findings showed that the MM has created the instability in the crystal structure, inducing additional surfaces on the V ₂ O ₅ -W-C powder, which made it more reactive and some oxygen atoms were depleted. The presence of W which has high affinity for oxygen adsorption and oxidization, resulted to a formation of WO ₃ . In addition, the prospective application of V ₂ O ₅ -W-C composite in gas sensing was investigated towards H ₂ S and H ₂ gases at 300 °C. The 30 h V ₂ O ₅ -W-C-650 °C-based sensor exhibited improved sensing response and excellent sensitivity towards H ₂ S gas. The fundamental sensing mechanism related to H ₂ S gas was also discussed.

Original language	English
Pages (from-to)	164-173
Number of pages	10
Journal	Applied Surface Science
Volume	473
DOIs	https://doi.org/10.1016/j.apsusc.2018.12.105
Publication status	Published - 15 Apr 2019
Externally published	Yes

Keywords

Composite
Gas sensing
Nanorods
V-W-O
VO
WO

ASJC Scopus subject areas

General Chemistry
Condensed Matter Physics
General Physics and Astronomy
Surfaces and Interfaces
Surfaces, Coatings and Films

Access to Document

10.1016/j.apsusc.2018.12.105

Cite this

Bolokang, A. S., & Motaung, D. E. (2019). Reduction-oxidation of V ₂ O ₅ -WO ₃ nanostructured by ball milling and annealing: Their improved H ₂ S gas sensing performance. Applied Surface Science, 473, 164-173. https://doi.org/10.1016/j.apsusc.2018.12.105

Bolokang, Amogelang S. ; Motaung, David E. / Reduction-oxidation of V ₂ O ₅ -WO ₃ nanostructured by ball milling and annealing : Their improved H ₂ S gas sensing performance. In: Applied Surface Science. 2019 ; Vol. 473. pp. 164-173.

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title = "Reduction-oxidation of V 2 O 5 -WO 3 nanostructured by ball milling and annealing: Their improved H 2 S gas sensing performance",

abstract = " Nanocrystalline composite VO 2 -WO 3 powder was produced via mechanical milling (MM) and annealing. SEM images showed the formation of rod-shaped and hollow-shaped like structures surrounded by nanoparticles. Transmission electron microscopy and selected area electron diffraction analyses demonstrated that the nanorods are single crystalline. X-ray diffraction technique was used to determine the structural transformation of the powder after mechanical milling and annealing. The mechanism related to the formation of ceramic composite powder was discussed in detail. The findings showed that the MM has created the instability in the crystal structure, inducing additional surfaces on the V 2 O 5 -W-C powder, which made it more reactive and some oxygen atoms were depleted. The presence of W which has high affinity for oxygen adsorption and oxidization, resulted to a formation of WO 3 . In addition, the prospective application of V 2 O 5 -W-C composite in gas sensing was investigated towards H 2 S and H 2 gases at 300 °C. The 30 h V 2 O 5 -W-C-650 °C-based sensor exhibited improved sensing response and excellent sensitivity towards H 2 S gas. The fundamental sensing mechanism related to H 2 S gas was also discussed.",

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doi = "10.1016/j.apsusc.2018.12.105",

language = "English",

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Bolokang, AS & Motaung, DE 2019, 'Reduction-oxidation of V ₂ O ₅ -WO ₃ nanostructured by ball milling and annealing: Their improved H ₂ S gas sensing performance', Applied Surface Science, vol. 473, pp. 164-173. https://doi.org/10.1016/j.apsusc.2018.12.105

Reduction-oxidation of V ₂ O ₅ -WO ₃ nanostructured by ball milling and annealing: Their improved H ₂ S gas sensing performance. / Bolokang, Amogelang S.; Motaung, David E.
In: Applied Surface Science, Vol. 473, 15.04.2019, p. 164-173.

Research output: Contribution to journal › Article › peer-review

TY - JOUR

T1 - Reduction-oxidation of V 2 O 5 -WO 3 nanostructured by ball milling and annealing

T2 - Their improved H 2 S gas sensing performance

AU - Bolokang, Amogelang S.

AU - Motaung, David E.

PY - 2019/4/15

Y1 - 2019/4/15

N2 - Nanocrystalline composite VO 2 -WO 3 powder was produced via mechanical milling (MM) and annealing. SEM images showed the formation of rod-shaped and hollow-shaped like structures surrounded by nanoparticles. Transmission electron microscopy and selected area electron diffraction analyses demonstrated that the nanorods are single crystalline. X-ray diffraction technique was used to determine the structural transformation of the powder after mechanical milling and annealing. The mechanism related to the formation of ceramic composite powder was discussed in detail. The findings showed that the MM has created the instability in the crystal structure, inducing additional surfaces on the V 2 O 5 -W-C powder, which made it more reactive and some oxygen atoms were depleted. The presence of W which has high affinity for oxygen adsorption and oxidization, resulted to a formation of WO 3 . In addition, the prospective application of V 2 O 5 -W-C composite in gas sensing was investigated towards H 2 S and H 2 gases at 300 °C. The 30 h V 2 O 5 -W-C-650 °C-based sensor exhibited improved sensing response and excellent sensitivity towards H 2 S gas. The fundamental sensing mechanism related to H 2 S gas was also discussed.

AB - Nanocrystalline composite VO 2 -WO 3 powder was produced via mechanical milling (MM) and annealing. SEM images showed the formation of rod-shaped and hollow-shaped like structures surrounded by nanoparticles. Transmission electron microscopy and selected area electron diffraction analyses demonstrated that the nanorods are single crystalline. X-ray diffraction technique was used to determine the structural transformation of the powder after mechanical milling and annealing. The mechanism related to the formation of ceramic composite powder was discussed in detail. The findings showed that the MM has created the instability in the crystal structure, inducing additional surfaces on the V 2 O 5 -W-C powder, which made it more reactive and some oxygen atoms were depleted. The presence of W which has high affinity for oxygen adsorption and oxidization, resulted to a formation of WO 3 . In addition, the prospective application of V 2 O 5 -W-C composite in gas sensing was investigated towards H 2 S and H 2 gases at 300 °C. The 30 h V 2 O 5 -W-C-650 °C-based sensor exhibited improved sensing response and excellent sensitivity towards H 2 S gas. The fundamental sensing mechanism related to H 2 S gas was also discussed.

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Bolokang AS, Motaung DE. Reduction-oxidation of V ₂ O ₅ -WO ₃ nanostructured by ball milling and annealing: Their improved H ₂ S gas sensing performance. Applied Surface Science. 2019 Apr 15;473:164-173. doi: 10.1016/j.apsusc.2018.12.105