Synthesis and sensory properties of tungsten (VI) oxide-based nanomaterials
Abstract
The purpose of this work was to develop a methodology for the synthesis of WO3-based nano-scale materials, to provide their characterization, and to study their sensory properties.
The nanopowder was made by slowly adding nitric acid to an aqueous solution of ammonium paratungstate,
(NH4)10W21O41·xH2O, followed by centrifugation, drying, and calcination. The size of tungsten trioxide grains, which was 10-20 nm, was determined by transmission electron microscopy. According to X-ray phase analysis, the powder, which was calcined at a temperature of 500 °C, mainly consisted of a triclinic phase. Subsequently, diammine palladium (II) nitrate and terpeniol were added to the WO3 nanopowder to form a paste. The resulting paste was applied to a special dielectric substrate and calcined to a temperature of 750 °C. As a result, a fragile tungsten trioxide-based gel formed. The mass fraction of palladium in the fragile gel was 3%. The sensory properties of the obtained gas-sensitive material were studied under stationary (300 °C) and non-stationary temperature conditions (quick heating to 450 °C and slow cooling to 100 °C).
A sharp increase in the sensitivity of a tungsten trioxide-based sensor was observed under non-stationary temperature conditions which depended on the composition of the gas-sensitive layer
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