Controllable Syntheses of Hierarchical WO3 Films Consisting of Orientation-Ordered Nanorod Bundles and Their Photocatalytic Properties

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College of Chemistry and Molecular Sciences, Wuhan University, Wuhan 430072, P. R. China
Cite this: Cryst. Growth Des. 2018, 18, 2, 794–801
Publication Date (Web):December 22, 2017
https://doi.org/10.1021/acs.cgd.7b01254
Copyright © 2017 American Chemical Society
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Abstract

A series of hierarchical hexagonal WO3 (h-WO3) films consisting of orientation-ordered nanorod bundles paralleling the fluorine-doped tin oxide (FTO) glass substrate were synthesized through a hydrothermal reaction of Na2WO4 solution (pH 2.30). By varying the Na2WO4 concentration, the aspect ratios of the h-WO3 nanorods and the shapes of the orderly stacked nanorod bundles can be conveniently adjusted, which then influence the morphology of the resultant hierarchical h-WO3 films on the FTO substrate. With enhancing the Na2WO4 concentration, the nanorod bundles are changed from a flat shape into a fusiform one to form h-WO3 film with a relatively smaller porosity and smoother surface. Compared with the h-WO3 film with fusiform-shaped nanorod bundles, the h-WO3 film with flat-shaped ones exhibits better photocatalytic O2 generation activity as the direct consequences of its larger specific surface area, higher roughness, and better light absorption property.

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The Supporting Information is available free of charge on the ACS Publications website at DOI: 10.1021/acs.cgd.7b01254.

  • FESEM images of HW1.2/HW1.5 films, HW1.0/HW2.0 films with the hydrothermal treatment time prolonging to 24 h, FTO substrate and WO3 seed layer-loaded substrate; TEM and HRTEM images of the fusiform-shaped nanorod bundle and its larger hierarchical structure in HW2.0 film; XRD patterns of HW1.0/HW2.0 films with different hydrothermal treatment times and HW2.0 films obtained at different temperatures (PDF)

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