Size‐ and Shape‐Controlled Conversion of Tungstate‐Based Inorganic–Organic Hybrid Belts to WO₃ Nanoplates with High Specific Surface Areas

Abstract

Two-dimensional monoclinic WO(3) nanoplates with high specific surface areas are synthesized through a novel conversion process using tungstate-based inorganic-organic hybrid micro/nanobelts as precursors. The process developed involves a topochemical transformation of tungstate-based inorganic-organic hybrid belts into WO(3) nanoplates via an intermediate product of H(2)WO(4) nanoplates, utilizing the similarity of the W-O octahedral layers in both H(2)WO(4) and WO(3). The as-obtained WO(3) nanoplates show a single-crystalline nanostructure with the smallest side along the [001] direction. The WO(3) nanoplates are 200-500 nm x 200-500 nm x 10-30 nm in size, and their specific surface areas are up to 180 m(2) g(-1). Photocatalytic measurements of visible-light-driven oxidation of water for O(2) generation in the presence of Ag(+) ions indicate that the activity of the as-obtained WO(3) nanoplates is one order of magnitude higher than that of commercially available WO(3) powders.

Fabrication and photoelectrochemical property of tungsten(vi) oxide films with a flake-wall structure

“…Crystal transformation to monoclinic WO 3 is considered to proceed through dehydration of hydroxyl groups in crystalline WO 3 •H 2 O. 19,20 Figure 3 shows top-view images of the prepared films observed by SEM. Flake-like morphology normal to the substrate was observed for both film-A and film-B.…”

Chemical processes employing inorganic layered compounds for inorganic and inorganic–organic hybrid materials

“…61) Acid treatment and heat treatment at 450°C led to the formation of WO 3 nanoplates with a very high specific surface area (180 m 2 g ¹1 ). 62) The WO 3 nanoplates exhibited very high photocatalytic activity for oxygen generation from water.…”

Using amino-functionalized Fe3O4-WO3 nanoparticles for diazinon removal from synthetic and real water samples in presence of UV irradiation

“…Cheapness, complete degradation, decomposition of pollutants even at very low amounts and degradation of toxic materials without pollution transfer to another phase are a few benefits of AOPs [13][14][15]. WO 3 is defined as a material with good photochromic, electrochromic, gas ochromic, and photocatalytic properties [16][17][18]. Further, compared to TiO 2 and ZnO, WO 3 is capable of absorbing more solar light in the visible region because its band gap is about 2.7 eV [16,17].…”

“…WO 3 is defined as a material with good photochromic, electrochromic, gas ochromic, and photocatalytic properties [16][17][18]. Further, compared to TiO 2 and ZnO, WO 3 is capable of absorbing more solar light in the visible region because its band gap is about 2.7 eV [16,17]. However, when WO 3 is used separately, its photocatalytic activity is weak because of its relatively low conduction-band level (0.5 V vs) [16,17].…”

“…Further, compared to TiO 2 and ZnO, WO 3 is capable of absorbing more solar light in the visible region because its band gap is about 2.7 eV [16,17]. However, when WO 3 is used separately, its photocatalytic activity is weak because of its relatively low conduction-band level (0.5 V vs) [16,17]. For improving the photocatalytic characteristic of WO 3 , Fe, Pt, Cu, and CuBi 2 O 4 are employed for synthesis and modification of it [16,17,19,20].…”