Tungsten Oxide Nanoplates: Facile Synthesis, Controllable Oxygen Deficiency and Photocatalytic Activity

Van Thai Nguyen, Hong Son Nguyen, Van Thang Pham, T. Tuyet Mai Nguyen, T. Lan Anh Luu, Huu Lam Nguyen, Duc Chien Nguyen, Cong Tu Nguyen
Author affiliations

Authors

  • Van Thai Nguyen School of Engineering Physics, Hanoi University of Science and Technology, No 1, Dai Co Viet, Hanoi
  • Hong Son Nguyen School of Engineering Physics, Hanoi University of Science and Technology
  • Van Thang Pham School of Engineering Physics, Hanoi University of Science and Technology, No 1, Dai Co Viet, Hanoi
  • T. Tuyet Mai Nguyen School of Chemical Engineering, Hanoi University of Science and Technology, No 1, Dai Co Viet, Hanoi
  • T. Lan Anh Luu School of Engineering Physics, Hanoi University of Science and Technology, No 1, Dai Co Viet, Hanoi http://orcid.org/0000-0002-0175-7975
  • Huu Lam Nguyen School of Engineering Physics, Hanoi University of Science and Technology, No 1, Dai Co Viet, Hanoi https://orcid.org/0000-0001-6483-167X
  • Duc Chien Nguyen School of Engineering Physics, Hanoi University of Science and Technology, No 1, Dai Co Viet, Hanoi
  • Cong Tu Nguyen School of Engineering Physics, Hanoi University of Science and Technology, No 1, Dai Co Viet, Hanoi https://orcid.org/0000-0002-1970-0571

DOI:

https://doi.org/10.15625/0868-3166/30/4/14425

Keywords:

tungsten oxide nanoplate, acid precipitation, optical bandgap, photocatalyst, oxygen deficiency

Abstract

Monoclinic tungsten oxide (WO3) nanoplates were synthesized via a two-step simple process: acid precipitation at room temperature to prepare WO3.H2O nanoplates and annealing at high temperature (400 and 500 oC) in ambient air to obtain WO3 nanoplates. The effect of annealing temperature on physical properties (morphology, oxygen deficiency, crystallinity, optical properties, and photocatalytic activity) of WO3 nanoplates was studied. At both two studied annealing temperatures, all samples have the stable monoclinic structure and visible light-range optical bandgap, but the morphology and photocatalytic activity of the samples vary significantly with annealing temperature. At higher annealing temperature (500 oC), the sample has both nanoplate and nanograin morphologies with round edges, higher crystallinity, larger optical bandgap (2.71 eV), and lower photocatalytic activity. The sample annealed at 400 oC has nanoplate morphology with sharp edges, lower optical bandgap (2.63 eV), and higher photocatalytic which shows a high potential for photocatalytic application under visible light irradiation. The effect of the annealing temperature on the properties of  WO3 nanoplates is assigned to the dehydration, the coalescence, and/or the melting processes at high temperatures. Dehydration causes the formation of oxygen vacancy – oxygen deficiency. The coalescence and/or the melting result in the changing of morphology and the decrease of the oxygen vacancies. These results imply a simple, cost-effective method to prepare highly oxygen-deficient WO3 nanoplates.

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20-10-2020

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[1]
V. T. Nguyen, “Tungsten Oxide Nanoplates: Facile Synthesis, Controllable Oxygen Deficiency and Photocatalytic Activity”, Comm. Phys., vol. 30, no. 4, p. 319, Oct. 2020.

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Vol. 30 No. 4 (2020)

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Received 19-07-2020
Accepted 07-10-2020
Published 20-10-2020

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