Morphological and humidity sensing characteristics of SnO2-CuO, SnO2-Fe2O3 and SnO2-SbO2 nanocooxides
Source abstract
Abstract
This paper reports the synthesis of SnO2-CuO, SnO2-Fe2O3 and SnO2-SbO2 composites of nano oxides and comparative study of humidity sensing on their electrical resistances. CuO, Fe2O3 and SbO2 were added within base material SnO2 in the ratio 1: 0.25, 1: 0.50 and 1: 1. Characterizations of materials were done using SEM and XRD. SEM images show the surface morphology and X-ray diffraction reveals the nanostructure of sensing materials. The pellets were annealed at 200, 400 and 600°C respectively for 3 h and after each step of annealing, observations were carried out. It was observed that as relative humidity (%RH) increases, there was decrease in the resistance of pellet for the entire range of RH. Results were found reproducible. SnO2-SbO2 shows maximum sensitivity for humidity (12 MΩ/%RH) among other composites.
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Research context
OpenAlex topics: Gas Sensing Nanomaterials and Sensors · Analytical Chemistry and Sensors · Transition Metal Oxide Nanomaterials
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