Effects of sputtering deposited homoseed layer microstructures on crystal growth behavior and photoactivity of chemical route-derived WO₃ nanorods

Abstract

The crystal growth properties of hydrothermally derived WO3 nanorods were investigated using various WO3 thin-film seed layers.

Enhanced photocatalytic activity of Ag2S particle decorated S-doped WO3 nanorods synthesized through two-stage vaporous vulcanization processes

“…The reflection spectra were measured, and the reflection spectra were further converted into absorption coefficients by the Kubelka–Munk equation. 7 A sharp absorption drop at approximately 400 nm was observed for the WO 3 nanorod template. This absorption edge is similar to that proposed for hydrothermally-derived WO 3 nanorod arrays by Zheng et al 40 Comparatively, the S-doped WO 3 nanorods present a marked redshift of the absorption edge.…”

“…Subsequently, WO 3 nanorods were hydrothermally grown on the WO 3 seed layer coated ITO substrate at 180 °C for 3.5 h. The detailed preparation parameters of the WO 3 seed layer and hydrothermal process parameters for WO 3 nanorods are described elsewhere. 28,29 For preparing sulfurdoped WO 3 nanorods, the as-synthesized WO 3 nanorod template was placed in a horizontal furnace tube for the sulfurization process. The horizontal furnace tube was initially pumped to a high vacuum level of 8 × 10 −5 Torr.…”

“…4,5 The WO 3 nanostructure is an excellent template for designing various composites or heterostructures for highly efficient photoactive devices. [6][7][8][9] WO 3 has various crystallographic structures; monoclinic (m-WO 3 ) and hexagonal (h-WO 3 ) WO 3 are commonly used phases in photocatalytic reactions. Compared with the energy gap of h-WO 3 , m-WO 3 has a smaller energy gap.…”

Improved photoelectrode performance of chemical solution-derived Bi2O3 crystals via manipulation of crystal characterization

“…19 The WO 3 homoseed layer with desirable surface grain size shows important inuence on the vertical alignment and aggregation in chemical route-derived one-dimensional WO 3 crystals. 20 Furthermore, homoseed layer of CuO has an important inuence on the crystallinity and morphology of CuO crystals grown via CBD routes. 21 In addition to the crystal growth behavior affected by the seed layer, the seed layer also dominates the as-grown crystals' characterization.…”

Design of Hydrothermally Derived Fe2O3 Rods with Enhanced Dual Functionality Via Sputtering Decoration of a Thin ZnO Coverage Layer

“…Aligned one-dimensional binary oxide semiconductors on various substrates have attracted a lot of attention due to their potential applications in photocatalysts, photoelectrochemical (PEC) electrodes, and gas sensors. − Hematite (α-Fe 2 O 3 ) is gaining importance in photoactivated device and gas sensor applications because it is an n-type semiconductor, low cost, highly chemically and thermally stable, and nontoxic. − Recently, one-dimensional hematite-based nanomaterials have been fabricated by employing various synthesis routes such as a hydrothermal method with a calcination process, , solvothermal route with the assistance of ionic liquid, and thermal oxidation of iron foil . Among these synthesis routes, the hydrothermal method is an effective and low-cost method to produce a large and uniform aligned hematite nanorods with a desirable crystalline quality on various substrates.…”