Sensing Behavior Of CuO-Doped SnO2 Thick Film Sensor For H2S Detection
نویسندگان
چکیده
The effect of CuO doping on the electrical resistance and the sensitivity of thick film gas sensors based on CuOdoped (1%, 2% and 5% by wt.) SnO2has been investigated by us. A suitable gas sensor structure wasfabricated on 1 ̋x1 ̋ alumina substrate using thick film technology. The fabricated sensor‟s reaction with H2S gas (250 ppm-1000 ppm)was tested in the temperature range of 150350 ̊C. At 250 ̊C the sensor with 5% CuO doping was found to be most sensitive for H2S gas .The electrical resistance and the sensitivity were increased by increasing the concentration of CuO. The substitution of Sn +4 by Cu +2 leads to the creation of oxygen vacancies. The increased oxygen deficiency is believed to be responsible for enhancing the resistance.
منابع مشابه
Improvement of H2S Sensing Properties of SnO2-Based Thick Film Gas Sensors Promoted with MoO3 and NiO
The effects of the SnO2 pore size and metal oxide promoters on the sensing properties of SnO2-based thick film gas sensors were investigated to improve the detection of very low H2S concentrations (<1 ppm). SnO2 sensors and SnO2-based thick-film gas sensors promoted with NiO, ZnO, MoO3, CuO or Fe2O3 were prepared, and their sensing properties were examined in a flow system. The SnO2 materials w...
متن کاملMECHANISM OF TRACE LEVEL H2S GAS SENSING USING RF SPUTTERED SnO2 THIN FILMS WITH CuO CATALYTIC OVERLAYER
H2S gas sensing response characteristics of bare SnO2 thin films and heterostuctures with nanolayer (10 nm) of Cu and CuO are studied. Changes in resistance values, occurring with integration of Cu and CuO nanolayers on SnO2 is acquired real-time, and compared. Rise in sensor resistance after introduction of Cu and CuO nanolayers on SnO2 sensing layer is understood to enhance the sensing respon...
متن کاملNanocrystalline tungsten oxide thick film sensor for the detection of H2S gas
Porous tungsten oxide nanocrystalline thick film sensors are prepared for the sensitive detection of H2S gas. The sensor characteristics are investigated with respect to H2S sensing over a temperature range 100-225 0 C in air. Optimum operating temperature for H2S sensing is found to be 200 0 C. Sensor response is investigated for various concentrations and the lowest measurable concentration i...
متن کاملUV Light Activation of TiO2-Doped SnO2 Thick Film for Sensing Ethanol at Room Temperature
TiO2-doped SnO2 nanopowder is synthesized via a sol-gel method and characterized by atomic force microscopy and X-ray diffraction. Using this nanopowder, we have fabricated a novel semiconductor gas sensor that is sensitive to UV light illumination. We find that gas-sensing properties of TiO2-doped SnO2 sensor can be enhanced significantly under the exposure of UV light. The sensor exhibits a h...
متن کاملUnderstanding the fundamental principles of metal oxide based gas sensors; the example of CO sensing with SnO2 sensors in the presence of humidity
This paper investigates the effect of water vapour in CO sensing by using Pd doped SnO2 sensors realized in thick film technology as an example of the basic understanding of sensing mechanisms applied to sensors. The results of phenomenological and spectroscopic measurement techniques, all of them obtained under working conditions for sensors, were combined with modelling in order to derive con...
متن کامل