Green Synthesis of Hexagonal-Shaped WO₃·0.33H₂O Nanodiscs Composed of Nanosheets

Abstract

A facile route for the preparation of WO 3 • 0.33H 2 O hexagonal-shaped nanodiscs composed of nanosheets via hydrothermal treatment of an aqueous peroxo-polytungstic acid solution has been demonstrated for the first time. The hexagonalshaped nanodiscs obtained have an average diameter of 200 nm and a mean thickness of several tens of nanometers. The effects of the preparation conditions such as the hydrothermal temperature and precursor concentration on the crystalline phase and morphology of the products have been studied systematically. The WO 3 • 0.33H 2 O nanodiscs with an orthorhombic structure and regular hexagonal morphology can be synthesized in a wide hydrothermal temperature range from 100 to 200 °C. However, in the absence of hydrogen peroxide, monoclinic tungsten oxide square nanoplates are obtained. The hexagonal-shaped nanodiscs morphology have been well explained based on the crystal structure of orthorhombic WO 3 • 0.33H 2 O. It is expected that this material with a well-defined and accessible crystal surface may find applications in catalysis, gas sensors, and other research areas.

Electrochromic properties of nanostructured tungsten trioxide (hydrate) films and their applications in a complementary electrochromic device

“…The inset crosssectional image shows that the film with a thickness of ∼560 nm has a good adherence to the substrate. According to the recent report [32], orthorhombic 3WO 3 ·H 2 O actually contains two type of corner-sharing WO 6 octahedras. One type is conducted by a central tungsten atom that is surrounded by six oxygen atoms, while in the second type, two of the oxygen atoms are replaced by a shorter terminal W O bond and longer W (OH) 2 bond, respectively.…”

Controlled synthesis of monodisperse WO3·H2O square nanoplates and their gas sensing properties

“…The morphological parameters such as size, shape and facet of tungsten oxide particles are critically important in its applications such as sensing properties [19,20]. Recently, in order to control the morphology and size of tungsten oxides, many efforts have been devoted to the syntheses route [21][22][23] As a result, a variety of chemical or physical methods have been applied to synthesize special nanostructures and morphologies such as nanowires [24,25], nanorods [26,27], nanotube [28], nanoplates [29,30], nanocuboids [31,32], hexagonal nanodisks [33], nanospheres [34] and hollow spheres [35].…”

Shape Evolution of Hierarchical W₁₈O₄₉ Nanostructures: A Systematic Investigation of the Growth Mechanism, Properties and Morphology-Dependent Photocatalytic Activities

“…After reaction for 12 h, the nanowires totally dispersed. Meanwhile, the diffusion and rearrangement of the local atomic occurred and part of O-W-O become W=O and W-OH2 bonds (Figure 5c), which is attributed to the increased water molecules [33,34]. The possible schematic illustration of the formation of the products obtained at different reaction time is depicted in Figure 5a.…”