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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...
Autores principales: | , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
MDPI
2020
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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. |
format | Online Article Text |
id | pubmed-7766188 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2020 |
publisher | MDPI |
record_format | MEDLINE/PubMed |
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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