Sensing response of toluene gas and structural properties of CdS-SnO2 thick films sensor

The present article studied the undoped and 1 wt% CdS (cadmium sulfide)-doped SnO2 (tin oxide) based toluene gas sensors. The fabricated samples were deposited using a Screen Printing technique on the alumina substrate. The structural, morphological, and sensing behavior of deposited thick film was observed using XRD, AFM, and locally made chamber. The XRD revealed the crystalline nature and crystallinity were found decreased with small doping of CdS (1 wt%). Crystallite size was found similar to 57.92 nm and similar to 51.53 nm for undoped SnO2 (U-S) and 1 wt% CdS-SnO2 (C-S) respectively and confirmed by AFM. The observed particle size was similar to 75x10(-9) m and similar to 46 x10(-9) m for U-S and C-S thick films. The reduction of crystallite size and grain size improved the sensing response for toluene gas at different temperatures of range 150-250 degrees C. The sensing response value reveals that the C-S sensor is more sensitive than U-S for toluene gas (5000 ppm) at 200 degrees C. (C) 2020 The Authors. Published by Elsevier Ltd.

Automated summary

This study fabricated undoped and 1 wt% CdS-doped SnO2 based toluene gas sensors using a Screen Printing technique and observed that CdS doping can improve the sensing response.