Abstract
This chapter summarizes the substitution of conventional analytical procedures by suitable selective chemical sensors. Devices allow continuous monitoring of concentrations in field, which is significant for environmental analysis. Components of multi-sensors are doped with Pt, Pd, and Al by sputtering. Each sensor is characterized by electrical measurements for various volatile organic compounds (VOCs) in a concentration range from 50 to 500 ppm in synthetic air at 300 °C. The best responses are obtained from Pt and Pd doped sensors mainly for oxygenated compounds. The influence of the oxygen species, ionosorbed on the sensing surface, on the VOCs detection is also discussed. The single component classification and the multi-component analysis of the VOCs are carried out. The principal component analysis (PCA) classification is permitted to distinguish the three families of VOCs. The best results from the multi-component analysis are obtained for the ILS and PCR methods.
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