Honeywell

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SnO2 Nanostructured Thick Films for CO Sensing
Keywords: SnO2, Thick Films , CO Sensing
SnO2-based gas sensors are good candidates for CO detection and known for relative low operating temperature, long term stability and low cost. To improve the sensing performance nanostructured materials may be used. It is expected that the high surface to volume ratio of nanostructures enhances gas sensitivity. In this work, we utilize Electrophoretic deposition technique (EPD) for the deposition of hydrothermally synthesized SnO2 nanostructured powders of two distinct morphologies, namely nanoparticles and nanoflower-like prisms, with the intent to obtain porous thick films to be used as CO sensors. Different conditions of hydrothermal synthesis are compared and their effect on the powder morphology assessed. With the aim to establish the relations between particle morphology, suspension stability, film morphology and CO gas sensing performance, composition of the suspensions is optimized for each powder type by adjusting the nature and amount of additive (TEA, PEI, iodine). SnO2 thick films are fabricated using constant voltage EPD and then sintered in air. CO gas sensitivity of the prepared thick films is measured at 150 oC. Obtained results indicate the feasibility of the improvement of gas sensing characteristics of SnO2 thick films by exploiting the effect of large surface area of the electrophoretically deposited nanostructure used as the active layer.
Anna Wlodarkiewicz, PhD student
CICECO, University of Aveiro
Aveiro, Aveiro
Portugal


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