Nature of Dopants and Effects on Sensitivity of SnO₂Based Gas Sensor

Abstract

In this work, a thick film SnO 2 sensor was fabricated on a 10 3 10 alumina substrate. It consists of a gas sensitive layer (SnO 2 ) doped with Pd and Pt; a pair of electrodes in array form underneath the gas sensing layers serves as a contact pad for sensor and a common heater element on the backside of the substrate. Alumina substrate (96%) has been used as a substrate for sensor fabrication. The fabricated sensor was tested for varying concentration of LPG and methane in a locally developed test chamber. The response of sensors to varying concentration of LPG and methane was studied at 3508C. The Pd-doped sensor was found to be more sensitive towards LPG and methane.

High-sensitive metal oxide gas sensor for BTEX gases based on ternary composite of Ce x Mn1−x O2/SnO2

“…Recently, some metal oxide gas sensors (MOGS), with the improvement of sensing materials, can achieve ppb or even sub-ppb levels detection limit to serve the stringent requirements [12][13][14], which can be a candidate for detecting BTEX at ppb level. Among various metal oxides, SnO 2 is one of the most materials for producing gas sensor due to its good chemical and thermal stability, wide operating temperature and high carrier density [15][16][17][18]. Sensors based on pristine SnO 2 , with the obvious drawbacks of poor gas response and high operating temperature [19,20], cannot meet the detection requirements.…”