TiO<sub>2</sub>/Cu<sub>2</sub>O/CuO Multi-Nanolayers as Sensors for H<sub>2</sub> and Volatile Organic Compounds: An Experimental and Theoretical Investigation
نویسندگان
چکیده
TiO2/Cu2O/CuO multi-nanolayers highly sensitive toward volatile organic compounds (VOCs) and H2 have been grown in various thicknesses by a cost-effective reproducible combined spray–sputtering–annealing approach. The ultrathin TiO2 films were deposited spray pyrolysis on top of sputtered–annealed Cu2O/CuO nanolayers to enhance their gas sensing performance improve protection against corrosion at high operating temperatures. prepared heterostructures investigated using scanning electron microscopy (SEM), X-ray diffraction (XRD), ultraviolet visible (UV–vis) micro-Raman spectroscopy. properties measured several temperatures, where the nanolayered sensors with oxide between 20 30 nm (Cu2O/CuO nanolayers) exhibited response an excellent selectivity ethanol vapor after thermal annealing samples 420 °C. results obtained temperature 350 °C demonstrate that CuO/Cu2O are mainly vapor, ∼150. changes from vapors hydrogen as thickness 50 nm. Density functional theory-based calculations carried out for geometries CuO(1̅11)/Cu2O(111) TiO2(111)/CuO(1̅11)/Cu2O(111) mechanism alcohols different chain lengths molecular hydrogen. reconstructed hexagonal Cu2O(111) surface monoclinic CuO(1̅11) TiO2(111) facets, all which terminate O layer, lead lowest energies each isolated material. We studied formation binary ternary heteroepitaxial interfaces planes best-matching lattices. Despite impact substrate lowering atomic charges adlayer sensor, we found it is structures devices fundamental driving change sensitivity observed experimentally. experimental data, supported computational results, important understanding use multi-nanolayered tested this work reliable, accurate, selective sensor tracking gases low concentrations.
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ژورنال
عنوان ژورنال: ACS Applied Materials & Interfaces
سال: 2021
ISSN: ['1944-8244', '1944-8252']
DOI: https://doi.org/10.1021/acsami.1c04379