Study of Cross Selectivity of Indium Doped Zno Thin film Gas Sensors useing Pattern Recognition Techniques

Abstract

Using the low cost sol gel spin coating technique indium doped ZnO thin films are synthesized. Structural and micro structural characteristics of all the grown films are studied using X ray diffraction analysis and field effect scanning electron microscopy respectively. Gas sensing characteristics are studied in presence of various concentrations of H2, CO and CH4, at different operating temperatures using a dynamic volume gas sensing measurement unit. Cross selectivity of the sensors towards all the gases is analyzed using pattern recognition technique. From this analysis it is observed that individual gases at each ppm level form well distinct clusters. The observed results demonstrated that PCA using FFT yield promising results in selective detection of the gases.
DOI: 10.17762/ijritcc2321-8169.150847