Optical properties of hydrated tungsten trioxide 3WO3·H2O

Abstract

. Films with different thicknesses were deposited on glass substrates pre-coated with fluorine-doped tin oxide via an efficient and simple hydrothermal method. Parametric models were used to extract thicknesses and optical constants of the thin films. The WO 3 was found to be more hydrated for thicker films. Moreover, the nano-plates are larger in thicker films, which leads to a decrease of the transmission due to an increase of the scattering. Features in the obtained dielectric functions of the 3WO 3 ·H 2 O thin films were compared with the earlier published optical spectra of WO 3 and its hydrates ½WO 3 ·H 2 O and WO 3 ·H 2 O.

Volatile Hexavalent Oxo-amidinate Complexes: Molybdenum and Tungsten Precursors for Atomic Layer Deposition

“…The band gap of the films after annealing was determined from UPS to be 3.64 ± 0.3 eV (SI, Figures S14–S17). This value is in good agreement with previous literature, − although somewhat higher than that reported for crystalline WO 3 films . Due to low surface coverage of the nanowires, a Hall effect measurement could not be obtained.…”

A New Method for Determining the Optical Constants of Highly Transparent Solids

“…2 The optical properties of highly transparent substrates are important for accurately designing optical systems and optical fiber waveguides. 3 Several typical methods have been introduced to obtain the optical constants of transparent crystals, 4 such as the combination method based on reflectance and transmittance, [5][6][7][8][9] the Kramers-Kronig transform method, [10][11][12] the photoacoustic technique method, 13,14 the attenuated total reflection method, 15 the ellipsometry method (EM), [16][17][18][19] and the transmission method. 20,21 Recently, the combination method based on the near-normal reflectance and normal transmittance measurement was regularly applied to measure the optical constants of materials with a relatively high refractive index.…”