8.3.5 Gas sensitivity of different metal oxide nanostructuredthinfilms
TL;DRAbstract
Two different techniques were used for manufacturing thin films of SnO 2 : RGTO [1] and pore wetting The former produces a microstructure formed by nanograins obtained and the latter a microstructure consisting of nanotubes. The film of SnO 2 nanotubes shows good sensitivity to volatile gases and an unusual sensitivity even at room temperature. SnO 2 microrods exhibited an ultra-fast photo-response when light of 402-940 nm wavelength was switched on and off. Furthermore, TiO 2 gas sensors were prepared by anodic oxidation method. The morphology of the TiO 2 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 NH 3 gas of concentrations ranging from 50 to 200 ppm.
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Two different techniques were used for manufacturing thin films of SnO 2 : RGTO [1] and pore wetting The former produces a microstructure formed by nanograins obtained and the latter a microstructure consisting of nanotubes. The film of SnO 2 nanotubes shows good sensitivity to volatile gases and an unusual sensitivity even at room temperature. SnO 2 microrods exhibited an ultra-fast photo-response when light of 402-940 nm wavelength was switched on and off. Furthermore, TiO 2 gas sensors were prepared by anodic oxidation method. The morphology of the TiO 2 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 NH 3 gas of concentrations ranging from 50 to 200 ppm.
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