8.3.5 Gas sensitivity of different metal oxide nanostructuredthinfilms
- Event
- 14th International Meeting on Chemical Sensors - IMCS 2012
2012-05-20 - 2012-05-23
Nürnberg/Nuremberg, Germany - Chapter
- 8.3 Metal Oxide-based Gas Sensors VIII
- Author(s)
- A. Lamagna - Micro and Nanotechnology Department, CNEA (Argentina)
- Pages
- 706 - 709
- DOI
- 10.5162/IMCS2012/8.3.5
- ISBN
- 978-3-9813484-2-2
- Price
- free
Abstract
Two different techniques were used for manufacturing thin films of SnO2: RGTO [1] and pore wetting [2-4]. The former produces a microstructure formed by nanograins obtained and the latter a microstructure consisting of nanotubes. The film of SnO2 nanotubes shows good sensitivity to volatile gases and an unusual sensitivity even at room temperature. SnO2 microrods exhibited an ultra-fast photo-response when light of 402-940 nm wavelength was switched on and off. Furthermore, TiO2 gas sensors were prepared by anodic oxidation method. The morphology of the TiO2 nanostructures were characterized by scanning electron microscopy (SEM), Xray diffraction (XRD) and Raman spectroscopy. At room temperature, the sensors exhibited highly sensitive and fast response-recovery (less than 2 min) to NH3 gas of concentrations ranging from 50 to 200 ppm.