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Chemiresistors Based on Li-Doped CuO-TiO2 Films
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SYSNO ASEP 0546331 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Chemiresistors Based on Li-Doped CuO-TiO2 Films Author(s) Torrisi, Alfio (UJF-V) RID, ORCID
Vacík, Jiří (UJF-V) RID, ORCID, SAI
Ceccio, Giovanni (UJF-V) ORCID, RID, SAI
Cannavó, Antonino (UJF-V) ORCID, SAI
Lavrentiev, Vasyl (UJF-V) RID, ORCID, SAI
Horák, Pavel (UJF-V) RID, ORCID
Yatskiv, Roman (URE-Y) RID, ORCID
Vaniš, Jan (URE-Y) RID
Grym, Jan (URE-Y)
Fišer, L. (CZ)
Hruška, M. (CZ)
Otta, J. (CZ)
Vrňata, M. (CZ)
Fitl, P. (CZ)Number of authors 14 Article number 246 Source Title Chemosensors. - : MDPI
Roč. 9, č. 9 (2021)Number of pages 20 s. Publication form Online - E Language eng - English Country CH - Switzerland Keywords chemiresistor ; CuO-TiO2 heterojunction ; Li-doping Subject RIV CG - Electrochemistry OECD category Nuclear physics Subject RIV - cooperation Institute of Radio Engineering and Electronics - Electronics ; Optoelectronics, Electrical Engineering R&D Projects GA19-02804S GA ČR - Czech Science Foundation (CSF) Research Infrastructure CANAM II - 90056 - Ústav jaderné fyziky AV ČR, v. v. i.
Reactors LVR-15 and LR-0 II - 90120 - Centrum výzkumu Řež s.r.o.Method of publishing Open access Institutional support URE-Y - RVO:67985882 ; UJF-V - RVO:61389005 UT WOS 000699256200001 EID SCOPUS 85114992369 DOI 10.3390/chemosensors9090246 Annotation Chemiresistors based on thin films of the Li-doped CuO-TiO2 heterojunctions were synthesized by a 2-step method: (i) repeated ion beam sputtering of the building elements (on the Si substrates and multisensor platforms), and (ii) thermal annealing in flowing air. The structure and composition of the films were analyzed by several methods: Rutherford Backscattering (RBS), Neutron Depth Profiling (NDP), Secondary Ion Mass Spectrometry (SIMS), and Atomic Force Microscopy (AFM), and their sensitivity to gaseous analytes was evaluated using a specific lab-made device operating in a continuous gas flow mode. The obtained results showed that the Li doping significantly increased the sensitivity of the sensors to oxidizing gases, such as NO2, O-3, and Cl-2, but not to reducing H-2. The sensing response of the CuO-TiO2-Li chemiresistors improved with increasing Li content. For the best sensors with about 15% Li atoms, the detection limits were as follows: NO2 -> 0.5 ppm, O-3 -> 10 ppb, and Cl-2 -> 0.1 ppm. The Li-doped sensors showed excellent sensing performance at a lower operating temperature (200 degrees C). However, even though their response time was only a few minutes, their recovery was slow (up to a few hours) and incomplete. Workplace Nuclear Physics Institute Contact Markéta Sommerová, sommerova@ujf.cas.cz, Tel.: 266 173 228 Year of Publishing 2022 Electronic address https://doi.org/10.3390/chemosensors9090246
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