Preparation of heterogenous copper-titanium oxides for chemiresistor applications

Torrisi, A.; Horák, P.; Vacı́k, J.; Cannavó, Antonino; Ceccio, G.; Yatskiv, Roman; Kupčı́k, Jaroslav; Fara, Jan; Fitl, Přemysl; Vlček, Jan; Vrňata, Martin

doi:10.1016/j.matpr.2020.05.061

Cited by 4 publications

(2 citation statements)

References 11 publications

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“…It is worth mentioning that the results presented in this work, in comparison to those presented in the literature, showed thin oxide films with different crystal structures. The phenomena of gas sensing in copper-titanium oxides have mostly been investigated in terms of their structures, which for copper oxides mostly refers to crystalline structure of pure CuO [41] or Cu 2 O-CuO structures [32,35,40,64]. In the case of this work, the copper oxides were composed of the nanocrystallites of Cu-Cu 2 O or Cu 2 O, while CuO was only observed on the surface.…”

Section: Resultsmentioning

confidence: 98%

“…Similarly, Lupan et al [32] obtained an enhanced gas response to ethanol compared to hydrogen in the temperature range between 523 and 623 K, which was opposite the result of Barreca et al [40], who showed that the response to hydrogen is about two times higher than that of ethanol. Furthermore, a mixed oxide of 50% TiO 2 and 50% CuO was found to be more sensitive to NO 2 than to H 2 , and could be further improved by adding Li to the mixture [41,42].…”

Section: Introductionmentioning

confidence: 99%

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Hydrogen Gas Sensing Properties of Mixed Copper–Titanium Oxide Thin Films

Mańkowska

Mazur

Domaradzki

et al. 2023

Sensors

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Hydrogen is an efficient source of clean and environmentally friendly energy. However, because it is explosive at concentrations higher than 4%, safety issues are a great concern. As its applications are extended, the need for the production of reliable monitoring systems is urgent. In this work, mixed copper–titanium oxide ((CuTi)Ox) thin films with various copper concentrations (0–100 at.%), deposited by magnetron sputtering and annealed at 473 K, were investigated as a prospective hydrogen gas sensing material. Scanning electron microscopy was applied to determine the morphology of the thin films. Their structure and chemical composition were investigated by X-ray diffraction and X-ray photoelectron spectroscopy, respectively. The prepared films were nanocrystalline mixtures of metallic copper, cuprous oxide, and titanium anatase in the bulk, whereas at the surface only cupric oxide was found. In comparison to the literature, the (CuTi)Ox thin films already showed a sensor response to hydrogen at a relatively low operating temperature of 473 K without using any extra catalyst. The best sensor response and sensitivity to hydrogen gas were found in the mixed copper–titanium oxides containing similar atomic concentrations of both metals, i.e., 41/59 and 56/44 of Cu/Ti. Most probably, this effect is related to their similar morphology and to the simultaneous presence of Cu and Cu2O crystals in these mixed oxide films. In particular, the studies of surface oxidation state revealed that it was the same for all annealed films and consisted only of CuO. However, in view of their crystalline structure, they consisted of Cu and Cu2O nanocrystals in the thin film volume.

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Section: Resultsmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

Hydrogen Gas Sensing Properties of Mixed Copper–Titanium Oxide Thin Films

Mańkowska

Mazur

Domaradzki

et al. 2023

Sensors

View full text Add to dashboard Cite

show abstract

Synthesis of Cu–Ti thin film multilayers on silicon substrates

et al. 2021

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Chemiresistors Based on Li-Doped CuO–TiO2 Films

et al. 2021

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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, O3, and Cl2, but not to reducing H2. 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, O3→ 10 ppb, and Cl2→ 0.1 ppm. The Li-doped sensors showed excellent sensing performance at a lower operating temperature (200 ∘C); however, even though their response time was only a few minutes, their recovery was slow (up to a few hours) and incomplete.

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Preparation of heterogenous copper-titanium oxides for chemiresistor applications

Cited by 4 publications

References 11 publications

Hydrogen Gas Sensing Properties of Mixed Copper–Titanium Oxide Thin Films

Hydrogen Gas Sensing Properties of Mixed Copper–Titanium Oxide Thin Films

Synthesis of Cu–Ti thin film multilayers on silicon substrates

Chemiresistors Based on Li-Doped CuO–TiO2 Films

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