Synthesis of nano-sized tungsten oxide particles encapsulated in a hollow silica sphere and their photocatalytic properties for decomposition of acetic acid using Pt as a co-catalyst

Abstract

We present a procedure for the synthesis of WO3 nanoparticles encapsulated in a hollow silica sphere, and their unique photocatalytic properties.

Glutathione-Mediated Synthesis of WO3 Nanostructures with Controllable Morphology/Phase for Energy Storage, Photoconductivity, and Photocatalytic Applications

“…The value of n, an integer, describes the direct (n = 1/2) or indirect (n = 2) transition. 41 Further, for WO 3 , which is an indirect semiconductor, n = 2 is used to determine the E g values. The as-determined band gap values of HTO, GHTO, and GTO are 3.27, 2.18, and 2.58 eV, respectively.…”

“…Utilizing the Kubelka–Munk (K–M) model, the indirect band gap values were determined by extrapolation of a linear fit to the rising edges of the respective (α h ν) 1/2 vs photon energy ( h ν) plots (Figure e) of the eq : α italichv = A false( italichv − E g false) n / 2 where A , α, v, and h are the constant, absorption coefficient, light frequency, and the Planck constant, respectively. The value of n , an integer, describes the direct ( n = 1/2) or indirect ( n = 2) transition . Further, for WO 3 , which is an indirect semiconductor, n = 2 is used to determine the E g values.…”