Abstract
The identification and quantification of mixed gas species have been still the research hotspot and difficulty of resistive gas sensor. In this work, Cu 2+ doped SnO 2 gas-sensing materials were prepared to quantitatively identify CO and H 2 gas mixture, and PID (Proportional-Integral-Differential) temperature control technology was combined to test the temperature modulation of gas-sensing materials more precisely. The results show that under the condition of Cu 2+ doping, the gas sensing performance for SnO 2 gas-sensing materials are improved, mainly because of the oxygen vacancy and the lattice distortion caused by doping. On the basis of this, the resistance value and the ratio of following-up time were taken as static and dynamic factors respectively to quantificationally distinguish CO and H 2 components. The resistance value and the following-up time ratio under different condition of temperature modulation were used to establish preliminarily a novel model for quantitatively determining the gas concentration, where the possibility of the composition of the two gases was first determined by the following-up time ratio, and then the gas concentration was determined by the comparison of the resistance. The simple mathematical model lays a foundation for the quantitative analysis of multicomponent gases. • Cu 2+ doped SnO 2 gas-sensing material were successfully prepared. • Effect of Cu 2+ on crystal structure and gas sensing performance was investigated. • PID technology was combined to ensure the accuracy of temperature modulation. • The dynamic and static adsorption-desorption characteristics of gas were analyzed. • A new model for quantitatively determining gas concentration is established.
Published Version
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call