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Detection mechanisms on chemiresistors with a sensitive layer based on nanostructured oxides (GAČR)

The project aims at preparation of nanostructured oxidic materials (SnO2, WO3, ZnO a In2O3), intended for sensitive layers of chemiresistors, and study of surface reactions taking place during the detection of selected classes of gaseous analytes (oxidizing gases - O2, NO2; reducing gases - H2, CH4; gases/vapours that can form hydrogen bonds with oxidic surface - H2O, NH3; unsaturated hydrocarbons; alcohols and ketones) on these layers. In the framework of the project a new diagnostic tool (NAP XPS) will be utilized for measurement of photoelectronic spectra during exposition of sensitive layer by gaseous analyte. It will enable to reveal the mechanisms of surface reactions during detection. There will be explored both experimental and theoretical consequences between nanoscale (morphology of sensitive layer, chemism of detection processes on its surface, corresponding modulation of electrophysical parameters of the layer) and macroscale - properties of chemiresitor as an integral device (sensitivity, selectivity, stability).

Grant provider Czech Science Foundation
Programme Standard Projects
Panel P204 – Physics of Condensed Matter and Materials
Project ID: 17-13427S
Duration Jan 2017 – Dec 2019
Principal investigator Prof. Martin Vrňata (UCT)
Investigator (Charles Univ.) Dr. Mykhailo Vorokhta
Partner organizations
University of Chemistry and Technology, Prague,
Institute of Physics of the Czech Academy of Sciences


  1. L. Fiser, K. Kadlec, J. Herbst: Studying the chemiresistor platform properties. In 2017 21st International Conference on Process Control (PC) (2017), doi:10.1109/pc.2017.7976228.
  2. S. Valtera, J. Prokeš, J. Kopecká, M. Vr?ata, M. Trchová, M. Varga, J. Stejskal, D. Kopecký: Dye-stimulated control of conducting polypyrrole morphology. RSC Adv. 7 (2017) 51495, doi:10.1039/c7ra10027b.
  3. P. Pokorný, J. Musil, M. Novotný, J. Lan?ok, P. Fitl, J. Vl?ek: Creation and behavior of radicals and ions in the Acetylene/Argon microwave ECR discharge. Plasma Processes Polym. 14 (2017) 1700062, doi:10.1002/ppap.201700062.
  4. D. Kopecký, M. Varga, J. Prokeš, M. Vr?ata, M. Trchová, J. Kopecká, M. Václavík: Optimization routes for high electrical conductivity of polypyrrole nanotubes prepared in presence of methyl orange. Synth. Met. 230 (2017) 89, doi:10.1016/j.synthmet.2017.06.004.
  5. P. Pokorný, J. Musil, J. Lan?ok, P. Fitl, M. Novotný, J. Bulí?, J. Vl?ek: Mass spectrometry investigation of magnetron sputtering discharges. Vacuum 143 (2017) 438, doi:10.1016/j.vacuum.2017.06.032.
  6. E. Marešová, D. Tome?ek, P. Fitl, J. Vl?ek, M. Novotný, L. Fišer, Š. Havlová, P. Hozák, A. Tudor, T. Glennon, L. Florea, S. Coyle, D. Diamond, Z. Skali?an, M. Hoskovcová, M. Vr?ata: Textile chemiresistors with sensitive layers based on polymer ionic liquids: Applicability for detection of toxic gases and chemical warfare agents. Sens. Actuators, B 266 (2018) 830, doi:10.1016/j.snb.2018.03.157.
  7. M. Vorokhta, I. Khalakhan, M. Vondrá?ek, D. Tome?ek, M. Vorokhta, E. Marešová, J. Nováková, J. Vl?ek, P. Fitl, M. Novotný, P. Hozák, J. Lan?ok, M. Vr?ata, I. Matolínová, V. Matolín: Investigation of gas sensing mechanism of SnO2 based chemiresistor using near ambient pressure XPS. Surf. Sci. 677 (2018) 284, doi:10.1016/j.susc.2018.08.003.
  8. D. Tomecek, M. Hruska, P. Fitl, J. Vlcek, E. Maresova, S. Havlova, L. Patrone, M. Vrnata: Phthalocyanine Photoregeneration for Low Power Consumption Chemiresistors. ACS Sens. 3 (2018) 2558, doi:10.1021/acssensors.8b00922.
  9. M. Chundak, I. Khalakhan, P. Kúš, T. Ducho?, V. Potin, A. Cacucci, N. Tsud, V. Matolín, K. Veltruská: Tailoring of highly porous SnO2 and SnO2-Pd thin films. Mater. Chem. Phys. 232 (2019) 485, doi:10.1016/j.matchemphys.2018.11.022.
  10. O. V. Larina, P. I. Kyriienko, D. Y. Balakin, M. Vorokhta, I. Khalakhan, Y. M. Nychiporuk, V. Matolín, S. O. Soloviev, S. M. Orlyk: Effect of ZnO on acid–base properties and catalytic performances of ZnO/ZrO2–SiO2 catalysts in 1,3-butadiene production from ethanol–water mixture. Catal. Sci. Technol. 9 (2019) 3964, doi:10.1039/c9cy00991d.
  11. E. Ciftyürek, B. Šmíd, Z. Li, V. Matolín, K. Schierbaum: Spectroscopic Understanding of SnO2 and WO3 Metal Oxide Surfaces with Advanced Synchrotron Based; XPS-UPS and Near Ambient Pressure (NAP) XPS Surface Sensitive Techniques for Gas Sensor Applications under Operational Conditions. Sensors 19 (2019) 4737, doi:10.3390/s19214737.
  12. M. Andrä, C. Funck, N. Raab, M. Rose, M. Vorokhta, F. Dvo?ák, B. Šmíd, V. Matolín, D. N. Mueller, R. Dittmann, R. Waser, S. Menzel, F. Gunkel: Effect of Cationic Interface Defects on Band Alignment and Contact Resistance in Metal/Oxide Heterojunctions. Adv. Electron. Mater. 6 (2019) 1900808, doi:10.1002/aelm.201900808.
  13. P. Hozák, M. Vorokhta, I. Khalakhan, K. Jarkovská, J. Cibulková, P. Fitl, J. Vl?ek, J. Fara, D. Tome?ek, M. Novotný, M. Vorokhta, J. Lan?ok, I. Matolínová, M. Vr?ata: New Insight into the Gas-Sensing Properties of CuOx Nanowires by Near-Ambient Pressure XPS. J. Phys. Chem. C 123 (2019) 29739, doi:10.1021/acs.jpcc.9b09124.
  14. Y. Lykhach, J. Kubát, A. Neitzel, N. Tsud, M. Vorokhta, T. Skála, F. Dvo?ák, Y. Kosto, K. C. Prince, V. Matolín, V. Johánek, J. Myslive?ek, J. Libuda: Charge transfer and spillover phenomena in ceria-supported iridium catalysts: A model study. J. Chem. Phys. 151 (2019) 204703, doi:10.1063/1.5126031.