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New Insights towards High-Temperature Ethanol-Sensing Mechanism of ZnO-Based Chemiresistors

In this work, we investigate ethanol (EtOH)-sensing mechanisms of a ZnO nanorod (NRs)-based chemiresistor using a near-ambient-pressure X-ray photoelectron spectroscopy (NAP-XPS). First, the ZnO NRs-based sensor was constructed, showing good performance on interaction with 100 ppm of EtOH in the amb...

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Autores principales: Piliai, Lesia, Tomeček, David, Hruška, Martin, Khalakhan, Ivan, Nováková, Jaroslava, Fitl, Přemysl, Yatskiv, Roman, Grym, Jan, Vorokhta, Mykhailo, Matolínová, Iva, Vrňata, Martin
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2020
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7582869/
https://www.ncbi.nlm.nih.gov/pubmed/33007876
http://dx.doi.org/10.3390/s20195602
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author Piliai, Lesia
Tomeček, David
Hruška, Martin
Khalakhan, Ivan
Nováková, Jaroslava
Fitl, Přemysl
Yatskiv, Roman
Grym, Jan
Vorokhta, Mykhailo
Matolínová, Iva
Vrňata, Martin
author_facet Piliai, Lesia
Tomeček, David
Hruška, Martin
Khalakhan, Ivan
Nováková, Jaroslava
Fitl, Přemysl
Yatskiv, Roman
Grym, Jan
Vorokhta, Mykhailo
Matolínová, Iva
Vrňata, Martin
author_sort Piliai, Lesia
collection PubMed
description In this work, we investigate ethanol (EtOH)-sensing mechanisms of a ZnO nanorod (NRs)-based chemiresistor using a near-ambient-pressure X-ray photoelectron spectroscopy (NAP-XPS). First, the ZnO NRs-based sensor was constructed, showing good performance on interaction with 100 ppm of EtOH in the ambient air at 327 °C. Then, the same ZnO NRs film was investigated by NAP-XPS in the presence of 1 mbar oxygen, simulating the ambient air atmosphere and O(2)/EtOH mixture at the same temperature. The partial pressure of EtOH was 0.1 mbar, which corresponded to the partial pressure of 100 ppm of analytes in the ambient air. To better understand the EtOH-sensing mechanism, the NAP-XPS spectra were also studied on exposure to O(2)/EtOH/H(2)O and O(2)/MeCHO (MeCHO = acetaldehyde) mixtures. Our results revealed that the reaction of EtOH with chemisorbed oxygen on the surface of ZnO NRs follows the acetaldehyde pathway. It was also demonstrated that, during the sensing process, the surface becomes contaminated by different products of MeCHO decomposition, which decreases dc-sensor performance. However, the ac performance does not seem to be affected by this phenomenon.
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spelling pubmed-75828692020-10-28 New Insights towards High-Temperature Ethanol-Sensing Mechanism of ZnO-Based Chemiresistors Piliai, Lesia Tomeček, David Hruška, Martin Khalakhan, Ivan Nováková, Jaroslava Fitl, Přemysl Yatskiv, Roman Grym, Jan Vorokhta, Mykhailo Matolínová, Iva Vrňata, Martin Sensors (Basel) Article In this work, we investigate ethanol (EtOH)-sensing mechanisms of a ZnO nanorod (NRs)-based chemiresistor using a near-ambient-pressure X-ray photoelectron spectroscopy (NAP-XPS). First, the ZnO NRs-based sensor was constructed, showing good performance on interaction with 100 ppm of EtOH in the ambient air at 327 °C. Then, the same ZnO NRs film was investigated by NAP-XPS in the presence of 1 mbar oxygen, simulating the ambient air atmosphere and O(2)/EtOH mixture at the same temperature. The partial pressure of EtOH was 0.1 mbar, which corresponded to the partial pressure of 100 ppm of analytes in the ambient air. To better understand the EtOH-sensing mechanism, the NAP-XPS spectra were also studied on exposure to O(2)/EtOH/H(2)O and O(2)/MeCHO (MeCHO = acetaldehyde) mixtures. Our results revealed that the reaction of EtOH with chemisorbed oxygen on the surface of ZnO NRs follows the acetaldehyde pathway. It was also demonstrated that, during the sensing process, the surface becomes contaminated by different products of MeCHO decomposition, which decreases dc-sensor performance. However, the ac performance does not seem to be affected by this phenomenon. MDPI 2020-09-30 /pmc/articles/PMC7582869/ /pubmed/33007876 http://dx.doi.org/10.3390/s20195602 Text en © 2020 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Piliai, Lesia
Tomeček, David
Hruška, Martin
Khalakhan, Ivan
Nováková, Jaroslava
Fitl, Přemysl
Yatskiv, Roman
Grym, Jan
Vorokhta, Mykhailo
Matolínová, Iva
Vrňata, Martin
New Insights towards High-Temperature Ethanol-Sensing Mechanism of ZnO-Based Chemiresistors
title New Insights towards High-Temperature Ethanol-Sensing Mechanism of ZnO-Based Chemiresistors
title_full New Insights towards High-Temperature Ethanol-Sensing Mechanism of ZnO-Based Chemiresistors
title_fullStr New Insights towards High-Temperature Ethanol-Sensing Mechanism of ZnO-Based Chemiresistors
title_full_unstemmed New Insights towards High-Temperature Ethanol-Sensing Mechanism of ZnO-Based Chemiresistors
title_short New Insights towards High-Temperature Ethanol-Sensing Mechanism of ZnO-Based Chemiresistors
title_sort new insights towards high-temperature ethanol-sensing mechanism of zno-based chemiresistors
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7582869/
https://www.ncbi.nlm.nih.gov/pubmed/33007876
http://dx.doi.org/10.3390/s20195602
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