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Thin films of tungsten trioxide were deposited on quartz substrates by RF magnetron sputtering. Different annealing temperatures in the range from 423 to 973 K were used under ambient atmosphere. The influence of the annealing temperature on the structure and optical properties of the resulting WO3 thin films were studied. The surface morphology of the films is composed of grains with an average size near 70 nm for the films annealed between 773 and 973 K. Some of the WO3 thin films were also coated with Pt nanoparticles of about 45 nm in size. Spectrometric measurements of transmittance were carried out for both types of WO3 samples in the wavelength range from 200-900 nm, to determine the effect of the exposure to two different gases namely H2 and CO. Films showed fast response and recovery times, in the range of few seconds. The addition of Pt nanoparticles enables reducing the operation temperature to room temperature. [ABSTRACT FROM AUTHOR]

Abstract: A new method of synthesising nano-particle-functionalised nanostructured materials via Aerosol Assisted Chemical Vapour Deposition (AACVD) has been used to grow WO3 nano-needles. Co-deposition of Gold (Au) nanoparticles with WO3 nano-needles has been implemented to deposit a sensing layer, which has shown surface plasmon resonance. The performed optical and structural studies had demonstrated that these materials have a high potential for an optical gas sensing. [Copyright &y& Elsevier]

Abstract: Thin films of WO3 were deposited on quartz substrates by the RF magnetron sputtering. Different annealing temperatures of 423, 473, 573 and 773K were used for different films. The films were annealed under the ambient conditions. The influence of the annealing temperature on the structure and optical properties of the WO3 was studied. The surface morphology of the thin films was investigated by atomic force microscopy, which showed that the annealing temperature increases the surface crystallinity. Spectrometric measurements of transmittance were carried out in the wavelength range 190–3300nm and the energy gap, Eg, has been evaluated. [Copyright &y& Elsevier]

Thin films of tungsten trioxide were deposited on quartz substrates by RF magnetron sputtering. Different annealing temperatures in the range from 423 to 973 K were used under ambient atmosphere. The influence of the annealing temperature on the structure and optical properties of the resulting WO3 thin films were studied. The surface morphology of the films is composed of grains with an average size near 70 nm for the films annealed between 773 and 973 K. Some of the WO3 thin films were also coated with Pt nanoparticles of about 45 nm in size. Spectrometric measurements of transmittance were carried out for both types of WO3 samples in the wavelength range from 200-900 nm, to determine the effect of the exposure to two different gases namely H2 and CO. Films showed fast response and recovery times, in the range of few seconds. The addition of Pt nanoparticles enables reducing the operation temperature to room temperature.