Preparation of heterogenous copper-titanium oxides for chemiresistor applications

0538506 - ÚACH 2021 RIV NL eng C - Conference Paper (international conference)
Torrisi, A. - Horák, P. - Vacík, J. - Cannavo, A. - Ceccio, G. - Yatskiv, R. - Kupčík, Jaroslav - Fara, J. - Fitl, P. - Vlček, J. - Vrňata, M.
Preparation of heterogenous copper-titanium oxides for chemiresistor applications.
Materials Today: Proceedings. Vol. 33. Amsterdam: Elsevier, 2020, Roč. 33 (2020), s. 2512-2516. ISSN 2214-7853.
[Symposium M on Metal Oxide- and Oxyhydride-Based Nanomaterials for Energy and Environment-Related Applications of the E-MRS Fall Meeting. Warsaw (PL), 16.09.2019-19.09.2019]
Institutional support: RVO:61388980
Keywords : thermal-oxidation * Chemiresistors * Gas sensing * P-n heterojuntions * Ion beam sputtering * CuO * TiO2
OECD category: Inorganic and nuclear chemistry

Metal oxide based gas sensors (MOS) found a wide application as modular parts in microelectronic devices due to their technological compatibility, low cost and outstanding sensing capabilities to different chemical species. The functionality of such chemiresistors consists of a change of the electric resistance/impedance of a semiconducting sensitive layer when gases with either oxidizing or reducing properties appear in the surrounding atmosphere. Earlier, the majority of the investigated chemiresistors were based on single phase, homogenous semiconductors. The combination of two different phases and hence the implementation of heterojunctions (HJs) on chemiresistors offers a way to increase the sensor performance, especially the sensitivity of the sensor. In this work, chemiresistors based on CuO-TiO2 acting as p-n heterojunction were developed. Thin sensitive layers were deposited by a two-step process. Cu Ti thin layers were prepared by ion beam sputtering using an Ar ion beam and, subsequently, oxidized by thermal annealing in air at 400 degrees C for 7 h. The stoichiometry of the metallic films was analyzed by the Rutherford Back-scattering (RBS) using 2 MeV alpha-particles. The gas sensing properties of the oxidic thin films (deposited on prefabricated substrates containing interdigital electrodes) were analyzed in an atmosphere containing 100 ppm of either methanol, hydrogen and acetaldehyde or 10.6 ppm of nitrogen dioxide.
Permanent Link: http://hdl.handle.net/11104/0316303