Potassium polytitanate gas-sensor study by impedance spectroscopy

F S Fedorov; A S Varezhnikov; I Kiselev; V V Kolesnichenko; I N Burmistrov; M Sommer; D Fuchs; C Kübel; A V Gorokhovsky; V V Sysoev

doi:10.1016/j.aca.2015.09.029

Potassium polytitanate gas-sensor study by impedance spectroscopy

Anal Chim Acta. 2015 Oct 15:897:81-6. doi: 10.1016/j.aca.2015.09.029. Epub 2015 Sep 25.

Authors

F S Fedorov¹, A S Varezhnikov², I Kiselev³, V V Kolesnichenko², I N Burmistrov⁴, M Sommer⁵, D Fuchs⁶, C Kübel⁷, A V Gorokhovsky², V V Sysoev²

Affiliations

¹ Yuri 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. Electronic address: fedorov_fs@daad-alumni.de.
² Yuri Gagarin State Technical University of Saratov, 77 Politechnicheskaya Street, 410054, Saratov, Russia.
³ Breitmeier Messtechnik GmbH, Ettlingen, Germany.
⁴ Yuri Gagarin State Technical University of Saratov, 77 Politechnicheskaya Street, 410054, Saratov, Russia; National University of Science and Technology (MISiS), 4 Leninskiy prospekt, 119049, Moscow, Russia.
⁵ Institute for Microstructure Technology, Karlsruhe Institute of Technology (KIT), Hermann-von-Helmholtz-Platz 1, 76344, Eggenstein-Leopoldshafen, Germany.
⁶ Institute for Solid-State Physics, Karlsruhe Institute of Technology (KIT), Hermann-von-Helmholtz-Platz 1, 76344, Eggenstein-Leopoldshafen, Germany.
⁷ Institute of Nanotechnology and Karslruhe Nano Micro Facility, Karlsruhe Institute of Technology (KIT), Hermann-von-Helmholtz-Platz 1, 76344, Eggenstein-Leopoldshafen, Germany.

PMID: 26515008
DOI: 10.1016/j.aca.2015.09.029

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.

Keywords: Gas sensor; Impedance spectroscopy; Multielectrode sensor array; Pattern recognition; Potassium polytitanate.