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Resistance characteristics of thin film sensors based on uncoated SnO2, SnO2 with CuO overlayer and SnO2 with CuO dotted clusters are compared in three different backgrounds of air, oxygen and vacuum. Measurements for the three sensor configurations are carried out as a function of temperature. The novel dispersal method of CuO catalyst in the form of dotted clusters is seen to enhance the oxygen...
In this paper the response of printed thick-film of WO3 doped by Y2O3 to organic solvent was studied. Different ratio of doping was prepared and changes of film resistance at different temperature in present of vaporized types of alcohol were observed. The results showed a high sensitivity of the film of 80.1%WO3-18.8%Y2O3 to Toluene, Xylene, Methanol, and 2-Propanone (Acetone) at 250, 450, and 550degC,...
Palladium nanowires (50 nm diameter, ~5 mum length) have been fabricated on silicon substrates using conventional techniques. The room temperature hydrogen sensing behavior of individual nanowires was investigated. The nanowires show a reversible response to hydrogen concentrations as low as 2.5 ppm with an ultra low power consumption of less than 10 nW. The electrical resistance increases nonlinearly...
Sensing devices using electronic-grade carbon nanotubes (EG-CNTs) as resistive sensing element were fabricated by dielectrophoresis (DEP) manipulation. DEP-based fabrication of EG-CNTs is important as it allows some control of the nominal resistance of the fabricated sensors, which is essential to improve the SNR of CNT sensors. The devices were characterized and the potential of EG-CNTs to serve...
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