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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