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Potassium polytitanate gas-sensor study by impedance spectroscopy
F S Fedorov1, A S Varezhnikov2, I Kiselev3
1Yuri Gagarin State Technical University of Saratov, 77 Politechnicheskaya Street, 410054, Saratov, Russia; V. A. Kotel'nikov Institute of RadioEng. & Electr. of RAS, Saratov Branch, 38 Zelenaya Street, 410019, Saratov, Russia.
Abstract:
Nanocrystalline potassium polytitanates K2O·nTiO2·mH2O represent a new type of semiconducting compounds which are characterized by a high specific surface that makes them promising for use in gas sensors. In this work, we have studied potassium polytitanate mesoporous nanoparticle agglomerates placed over a SiO2/Si substrate equipped with multiple coplanar electrodes to measure the electrical response to various organic vapors, 1000 ppm of concentration, mixed with air by impedance spectrometry in range of the 10(-2)-10(6) Hz. The recorded impedance data for each sensor segment are associated with RC components of an equivalent circuit which are applied to selectively recognize the test vapors exploiting a "multisensor array" approach.
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