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Gagaoudakis E, Tsakirakis A, Moschogiannaki M, Sfakianou A, Binas V. Room-Temperature Nitric Oxide Gas Sensors Based on NiO/SnO 2 Heterostructures. Sensors (Basel) 2023; 23:8583. [PMID: 37896676 PMCID: PMC10610847 DOI: 10.3390/s23208583] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/08/2023] [Revised: 10/16/2023] [Accepted: 10/18/2023] [Indexed: 10/29/2023]
Abstract
Nitric oxide (NO) is a very well-known indoor pollutant, and high concentrations of it in the atmosphere lead to acid rain. Thus, there is great demand for NO sensors that have the ability to work at room temperature. In this work, NiO/SnO2 heterostructures have been prepared via the polyol process and were tested against different concentrations of NO gas at room temperature. The structural and morphological characteristics of the heterostructures were examined using X-ray diffraction and scanning electron microscopy, respectively, while the ratio of NiO to SnO2 was determined through the use of energy-dispersive spectrometry. The effects of both pH and thermal annealing on the morphological, structural and gas-sensing properties of the heterostructure were investigated. It was found that the morphology of the heterostructures consisted of rod-like particles with different sizes, depending on the temperature of thermal annealing. Moreover, NiO/SnO2 heterostructures synthesized with pH = 8 and annealed at 900 °C showed a response of 1.8% towards 2.5 ppm NO at room temperature. The effects of humidity as well as of stability on the gas sensing performance were also investigated.
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Affiliation(s)
- Emmanouil Gagaoudakis
- Institute of Electronic Structure and Laser, Foundation for Research and Technology-Hellas (FORTH-IESL), 700 13 Heraklion, Greece; (A.T.); (M.M.); (A.S.); (V.B.)
| | - Apostolos Tsakirakis
- Institute of Electronic Structure and Laser, Foundation for Research and Technology-Hellas (FORTH-IESL), 700 13 Heraklion, Greece; (A.T.); (M.M.); (A.S.); (V.B.)
- Department of Materials Science and Technology, University of Crete, 700 13 Herakleion, Greece
| | - Marilena Moschogiannaki
- Institute of Electronic Structure and Laser, Foundation for Research and Technology-Hellas (FORTH-IESL), 700 13 Heraklion, Greece; (A.T.); (M.M.); (A.S.); (V.B.)
- Department of Materials Science and Technology, University of Crete, 700 13 Herakleion, Greece
| | - Angeliki Sfakianou
- Institute of Electronic Structure and Laser, Foundation for Research and Technology-Hellas (FORTH-IESL), 700 13 Heraklion, Greece; (A.T.); (M.M.); (A.S.); (V.B.)
- Department of Physics, University of Crete, 700 13 Herakleion, Greece
| | - Vassilios Binas
- Institute of Electronic Structure and Laser, Foundation for Research and Technology-Hellas (FORTH-IESL), 700 13 Heraklion, Greece; (A.T.); (M.M.); (A.S.); (V.B.)
- Department of Physics, University of Crete, 700 13 Herakleion, Greece
- Department of Chemistry, Aristotle University of Thessaloniki, 541 24 Thessaloniki, Greece
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Faka V, Tsoumachidou S, Moschogiannaki M, Kiriakidis G, Poulios I, Binas V. ZnWO4 nanoparticles as efficient photocatalyst for degradation of para-aminobenzoic acid: Impact of annealing temperature on photocatalytic performance. J Photochem Photobiol A Chem 2021. [DOI: 10.1016/j.jphotochem.2020.113002] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Murcia-López S, Moschogiannaki M, Binas V, Andreu T, Tang P, Arbiol J, Jacas Biendicho J, Kiriakidis G, Morante JR. Insights into the Performance of Co xNi 1-xTiO 3 Solid Solutions as Photocatalysts for Sun-Driven Water Oxidation. ACS Appl Mater Interfaces 2017; 9:40290-40297. [PMID: 29094924 DOI: 10.1021/acsami.7b12994] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
CoxNi1-xTiO3 systems evaluated as photo- and electrocatalytic materials for oxygen evolution reaction (OER) from water have been studied. These materials have shown promising properties for this half-reaction both under (unbiased) visible-light photocatalytic approach in the presence of an electron scavenger and as electrocatalysts in dark conditions in basic media. In both situations, Co0.8Ni0.2TiO3 exhibits the best performance and is proved to display high faradaic efficiency. A synergetic effect between Co and Ni is established, improving the physicochemical properties such as surface area and pore size distribution, besides affecting the donor density and the charge carrier separation. At higher Ni content, the materials exhibit behavior more similar to that of NiTiO3, which is a less suitable material for OER than CoTiO3.
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Affiliation(s)
- Sebastián Murcia-López
- Catalonia Institute for Energy Research (IREC) , Jardins de les Dones de Negre 1, 08930 Sant Adrià de Besós, Catalonia, Spain
| | - Marilena Moschogiannaki
- Institute of Electronic Structure and Laser (IESL-FORTH) , Vasilika Vouton, GR-71110 Heraklion, Greece
- University of Crete , GR-70013 Heraklion, Greece
| | - Vassilios Binas
- Institute of Electronic Structure and Laser (IESL-FORTH) , Vasilika Vouton, GR-71110 Heraklion, Greece
- University of Crete , GR-70013 Heraklion, Greece
| | - Teresa Andreu
- Catalonia Institute for Energy Research (IREC) , Jardins de les Dones de Negre 1, 08930 Sant Adrià de Besós, Catalonia, Spain
- University of Barcelona (UB) , Marti i Franquès 1, 08028 Barcelona, Catalonia, Spain
| | - PengYi Tang
- Catalonia Institute for Energy Research (IREC) , Jardins de les Dones de Negre 1, 08930 Sant Adrià de Besós, Catalonia, Spain
- Catalan Institute of Nanoscience and Nanotechnology (ICN2), CSIC, and The Barcelona Institute of Science and Technology (BIST) , Campus UAB, Bellaterra, 08193 Barcelona, Catalonia, Spain
| | - Jordi Arbiol
- Catalan Institute of Nanoscience and Nanotechnology (ICN2), CSIC, and The Barcelona Institute of Science and Technology (BIST) , Campus UAB, Bellaterra, 08193 Barcelona, Catalonia, Spain
- ICREA , Passeig Lluís Companys 23, 08010 Barcelona, Catalonia, Spain
| | - Jordi Jacas Biendicho
- Catalonia Institute for Energy Research (IREC) , Jardins de les Dones de Negre 1, 08930 Sant Adrià de Besós, Catalonia, Spain
| | - George Kiriakidis
- Institute of Electronic Structure and Laser (IESL-FORTH) , Vasilika Vouton, GR-71110 Heraklion, Greece
- University of Crete , GR-70013 Heraklion, Greece
| | - Joan R Morante
- Catalonia Institute for Energy Research (IREC) , Jardins de les Dones de Negre 1, 08930 Sant Adrià de Besós, Catalonia, Spain
- University of Barcelona (UB) , Marti i Franquès 1, 08028 Barcelona, Catalonia, Spain
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