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Electrospun ZnO/Pd Nanofibers: CO Sensing and Humidity Effect

Variable air humidity affects the characteristics of semiconductor metal oxides, which complicates the reliable and reproducible determination of CO content in ambient air by resistive gas sensors. In this work, we determined the sensor properties of electrospun ZnO and ZnO/Pd nanofibers in the dete...

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Autores principales: Platonov, Vadim, Rumyantseva, Marina, Khmelevsky, Nikolay, Gaskov, Alexander
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2020
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7766188/
https://www.ncbi.nlm.nih.gov/pubmed/33419349
http://dx.doi.org/10.3390/s20247333
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author Platonov, Vadim
Rumyantseva, Marina
Khmelevsky, Nikolay
Gaskov, Alexander
author_facet Platonov, Vadim
Rumyantseva, Marina
Khmelevsky, Nikolay
Gaskov, Alexander
author_sort Platonov, Vadim
collection PubMed
description Variable air humidity affects the characteristics of semiconductor metal oxides, which complicates the reliable and reproducible determination of CO content in ambient air by resistive gas sensors. In this work, we determined the sensor properties of electrospun ZnO and ZnO/Pd nanofibers in the detection of CO in dry and humid air, and investigated the sensing mechanism. The microstructure of the samples, palladium content, and oxidation state, type, and concentration of surface groups were characterized using complementary techniques: X-ray fluorescent spectroscopy, XRD, high-resolution transmission electron microscopy (HRTEM), high angle annular dark field scanning transmission electron microscopy (HAADF-STEM), energy-dispersive X-ray (EDX) mapping, XPS, and FTIR spectroscopy. The sensor properties of ZnO and ZnO/Pd nanofibers were studied at 100–450 °C in the concentration range of 5–15 ppm CO in dry (RH(25) = 0%) and humid (RH(25) = 60%) air. It was found that under humid conditions, ZnO completely loses its sensitivity to CO, while ZnO/Pd retains a high sensor response. On the basis of in situ diffuse reflectance IR Fourier transform spectroscopy (DRIFTS) results, it was concluded that high sensor response of ZnO/Pd nanofibers in dry and humid air was due to the electronic sensitization effect, which was not influenced by humidity change.
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spelling pubmed-77661882020-12-28 Electrospun ZnO/Pd Nanofibers: CO Sensing and Humidity Effect Platonov, Vadim Rumyantseva, Marina Khmelevsky, Nikolay Gaskov, Alexander Sensors (Basel) Article Variable air humidity affects the characteristics of semiconductor metal oxides, which complicates the reliable and reproducible determination of CO content in ambient air by resistive gas sensors. In this work, we determined the sensor properties of electrospun ZnO and ZnO/Pd nanofibers in the detection of CO in dry and humid air, and investigated the sensing mechanism. The microstructure of the samples, palladium content, and oxidation state, type, and concentration of surface groups were characterized using complementary techniques: X-ray fluorescent spectroscopy, XRD, high-resolution transmission electron microscopy (HRTEM), high angle annular dark field scanning transmission electron microscopy (HAADF-STEM), energy-dispersive X-ray (EDX) mapping, XPS, and FTIR spectroscopy. The sensor properties of ZnO and ZnO/Pd nanofibers were studied at 100–450 °C in the concentration range of 5–15 ppm CO in dry (RH(25) = 0%) and humid (RH(25) = 60%) air. It was found that under humid conditions, ZnO completely loses its sensitivity to CO, while ZnO/Pd retains a high sensor response. On the basis of in situ diffuse reflectance IR Fourier transform spectroscopy (DRIFTS) results, it was concluded that high sensor response of ZnO/Pd nanofibers in dry and humid air was due to the electronic sensitization effect, which was not influenced by humidity change. MDPI 2020-12-20 /pmc/articles/PMC7766188/ /pubmed/33419349 http://dx.doi.org/10.3390/s20247333 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
Platonov, Vadim
Rumyantseva, Marina
Khmelevsky, Nikolay
Gaskov, Alexander
Electrospun ZnO/Pd Nanofibers: CO Sensing and Humidity Effect
title Electrospun ZnO/Pd Nanofibers: CO Sensing and Humidity Effect
title_full Electrospun ZnO/Pd Nanofibers: CO Sensing and Humidity Effect
title_fullStr Electrospun ZnO/Pd Nanofibers: CO Sensing and Humidity Effect
title_full_unstemmed Electrospun ZnO/Pd Nanofibers: CO Sensing and Humidity Effect
title_short Electrospun ZnO/Pd Nanofibers: CO Sensing and Humidity Effect
title_sort electrospun zno/pd nanofibers: co sensing and humidity effect
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7766188/
https://www.ncbi.nlm.nih.gov/pubmed/33419349
http://dx.doi.org/10.3390/s20247333
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