In the present study, we fabricate undoped and 1 wt% palladium (Pd)-doped tin oxide (SnO2) films were deposited on alumina substrate using screen printing technology. The deposited sensing film is… Click to show full abstract
In the present study, we fabricate undoped and 1 wt% palladium (Pd)-doped tin oxide (SnO2) films were deposited on alumina substrate using screen printing technology. The deposited sensing film is characterized and its microstructural properties are studied using X-ray diffraction (XRD) and atomic force microscope (AFM). The crystallite size, grain size, and roughness parameter decrease with Pd doping. It was ~ 23.5 nm and ~ 19.2 nm for undoped and Pd-doped SnO2 film samples. The response of fabricated thick film sensor for 1 wt% Pd-doped SnO2 is maximum (~ 71) with varying concentrations of ethanol (5000 ppm) at operating temperature 473 K. The response/recovery time is observed and it is ~ 41 s/125 s. The reduction in crystallinity and roughness leads to improves sensing behavior towards ethanol gas. The sensing mechanism and response behavior is explained based on a theoretical model.
               
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