Study On Gas Sensing And Catalytic Properties Based On SnO_2-x Nanocomposites

This paper aims at preparating gas sensing nanocomposites based on SnO_2-x with chemical homogeneous and superior thermal stability compared to single-component oxide using chemical controlled co-precipitation method and testing their sensing properties for detection of toxic gases. The particle size, morphology, surface area, thermal and phase stability of the nanocomposites was characterized by means of XRD, TEM, BET and TG-DTA etc. The effect of synthetic reaction conditions such as metal salt total concentration, precipitation pH value, composition of nanocomposites and calcinations temperature on the performance of gas sensing materials based on SnO_2-x was studied in this paper and the optimized synthesis parameters have been established.In addition, the effect of composition of nanocomposites, operating temperature, calcinations temperature and target gas concentration on sensing performance of the nanocomposites is investigated using co-precipitation derived nano-sized powers. The results showed that these nanocomposites exhibited high sensitivity and selectivity for the detection of CO and NO₂, and the sensing properties was dependent on the...