Tungsten oxide nano-powders were prepared by acidic precipitation from sodium tungstate solution. The alternative processes of the applied hydrothermal method resulted in different structure and morphology of hexagonal WO3nano-crystals. Micro-hotplates with gold electrodes on top to measure sensing layer conductivity were fabricated. WO3 layers of the two morphologies were deposited using capillary dropping technique. Sensor responses were measured up to 220 °C operation temperature for NH3 diluted in synthetic air in the 10-100 ppm range. Test results are compared in terms of conductivity, sensitivity and response time.
|Number of pages||4|
|Publication status||Published - Jan 1 2014|
|Event||28th European Conference on Solid-State Transducers, EUROSENSORS 2014 - Brescia, Italy|
Duration: Sep 7 2014 → Sep 10 2014
- Gas sensor
- Hexagonal WO
ASJC Scopus subject areas