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Al2O3/ZnO Heterostructure-Based Sensors for Volatile Organic Compounds in Safety Applications

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dc.contributor.author LUPAN, Oleg
dc.contributor.author SANTOS-CARBALLAL, David
dc.contributor.author MAGARIU, Nicolae
dc.contributor.author MISHRA, Abhishek Kumar
dc.contributor.author ABABII, Nicolai
dc.contributor.author KRÜGER, Helge
dc.contributor.author WOLFF, Niklas
dc.contributor.author VAHL, Alexander
dc.contributor.author BODDULURI, Mani Teja
dc.contributor.author KOHLMANN, Niklas
dc.contributor.author KIENLE, Lorenz
dc.contributor.author ADELUNG, Rainer
dc.contributor.author LEEUW, Nora H. de
dc.contributor.author HANSEN, Sandra
dc.date.accessioned 2023-11-09T07:16:09Z
dc.date.available 2023-11-09T07:16:09Z
dc.date.issued 2022
dc.identifier.citation LUPAN, Oleg, SANTOS-CARBALLAL, David, MAGARIU, Nicolae et al. Al2O3/ZnO Heterostructure-Based Sensors for Volatile Organic Compounds in Safety Applications. In: ACS Applied Materials & Interfaces. 2022, vol. 14. iss. 25, pp. 29331-29344. ISSN 1944-8244. en_US
dc.identifier.issn 1944-8244
dc.identifier.uri https://doi.org/10.1021/acsami.2c03704
dc.identifier.uri http://repository.utm.md/handle/5014/24703
dc.description Acces full text - https://doi.org/10.1021/acsami.2c03704 en_US
dc.description.abstract In this work, we demonstrate the sensing properties toward the most common VOCs of columnar Al2O3/ZnO heterolayer-based sensors. We have also developed an approach to tune the sensor selectivity by changing the thickness of the exposed amorphous Al2O3 layer from 5 to 18 nm. Columnar ZnO films are prepared by a chemical solution method, where the exposed surface is decorated with an Al2O3 nanolayer via thermal atomic layer deposition at 75 °C. We have investigated the structure and morphology as well as the vibrational, chemical, electronic, and sensor properties of the Al2O3/ZnO heterostructures. Transmission electron microscopy (TEM) studies show that the upper layers consist of amorphous Al2O3 films. The heterostructures showed selectivity to 2-propanol vapors only within the range of 12–15 nm thicknesses of Al2O3, with the highest response value of ∼2000% reported for a thickness of 15 nm at the optimal working temperature of 350 °C. Density functional theory (DFT) calculations of the Al2O3/ZnO(1010) interface and its interaction with 2-propanol (2-C3H7OH), n-butanol (n-C4H9OH), ethanol (C2H5OH), acetone (CH3COCH3), hydrogen (H2), and ammonia (NH3) show that the molecular affinity for the Al2O3/ZnO(1010) interface decreases from 2-propanol (2-C3H7OH) ≈ n-butanol (n-C4H9OH) > ethanol (C2H5OH) > acetone (CH3COCH3) > hydrogen (H2), which is consistent with our gas response experiments for the VOCs. en_US
dc.language.iso en en_US
dc.publisher American Chemical Society en_US
dc.rights Attribution-NonCommercial-NoDerivs 3.0 United States *
dc.rights.uri http://creativecommons.org/licenses/by-nc-nd/3.0/us/ *
dc.subject zinc oxide en_US
dc.subject aluminium oxide en_US
dc.subject heterojunctions en_US
dc.subject volatile organic compounds en_US
dc.subject semiconducting metal oxides en_US
dc.subject gas sensors en_US
dc.subject gas response en_US
dc.title Al2O3/ZnO Heterostructure-Based Sensors for Volatile Organic Compounds in Safety Applications en_US
dc.type Article en_US


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