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Humidity Sensing Ceria Thin-Films

Lowering the constitutive domains of semiconducting oxides to the nano-range has recently opened up the possibility of added benefit in the research area of sensing materials, in terms both of greater specific surface area and pore volume. Among such nanomaterials, ceria has attracted much attention...

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Autores principales: Mandić, Vilko, Bafti, Arijeta, Pavić, Luka, Panžić, Ivana, Kurajica, Stanislav, Pavelić, Jakov-Stjepan, Shi, Zhen, Mužina, Katarina, Ivković, Ivana Katarina
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2022
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8840404/
https://www.ncbi.nlm.nih.gov/pubmed/35159866
http://dx.doi.org/10.3390/nano12030521
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author Mandić, Vilko
Bafti, Arijeta
Pavić, Luka
Panžić, Ivana
Kurajica, Stanislav
Pavelić, Jakov-Stjepan
Shi, Zhen
Mužina, Katarina
Ivković, Ivana Katarina
author_facet Mandić, Vilko
Bafti, Arijeta
Pavić, Luka
Panžić, Ivana
Kurajica, Stanislav
Pavelić, Jakov-Stjepan
Shi, Zhen
Mužina, Katarina
Ivković, Ivana Katarina
author_sort Mandić, Vilko
collection PubMed
description Lowering the constitutive domains of semiconducting oxides to the nano-range has recently opened up the possibility of added benefit in the research area of sensing materials, in terms both of greater specific surface area and pore volume. Among such nanomaterials, ceria has attracted much attention; therefore, we chemically derived homogeneous ceria nanoparticle slurries. One set of samples was tape-casted onto a conducting glass substrate to form thin-films of various thicknesses, thereby avoiding demanding reaction conditions typical of physical depositions, while the other was pressed into pellets. Structural and microstructural features, along with electrical properties and derivative humidity-sensing performance of ceria thin-films and powders pressed into pellets, were studied in detail. Particular attention was given to solid-state impedance spectroscopy (SS-IS), under controlled relative humidity (RH) from 30%–85%, in a wide temperature and frequency range. Moreover, for the thin-film setup, measurements were performed in surface-mode and cross-section-mode. From the results, we extrapolated the influence of composition on relative humidity, the role of configuration and thin-film thickness on electrical properties, and derivative humidity-sensing performance. The structural analysis and depth profiling both point to monophasic crystalline ceria. Microstructure analysis reveals slightly agglomerated spherical particles and thin-films with low surface roughness. Under controlled humidity, the shape of the conductivity spectrum stays the same along with an increase in RH, and a notable shift to higher conductivity values. The relaxation is slow, as the thickness of the pellet slows the return of conductivity values. The increase in humidity has a positive effect on the overall DC conductivity, similar to the temperature effect for semiconducting behavior. As for the surface measurement setup, the thin-film thickness impacts the shape of the spectra and electrical processes. The surface measurement setup turns out to be more sensitive to relative humidity changes, emphasized with higher RH, along with an increase in thin-film thickness. The moisture directly affects the conductivity spectra in the dispersion part, i.e., on the localized short-range charge carriers. Moisture sensitivity is a reversible process for thin-film samples, in contrast to pellet form samples.
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spelling pubmed-88404042022-02-13 Humidity Sensing Ceria Thin-Films Mandić, Vilko Bafti, Arijeta Pavić, Luka Panžić, Ivana Kurajica, Stanislav Pavelić, Jakov-Stjepan Shi, Zhen Mužina, Katarina Ivković, Ivana Katarina Nanomaterials (Basel) Article Lowering the constitutive domains of semiconducting oxides to the nano-range has recently opened up the possibility of added benefit in the research area of sensing materials, in terms both of greater specific surface area and pore volume. Among such nanomaterials, ceria has attracted much attention; therefore, we chemically derived homogeneous ceria nanoparticle slurries. One set of samples was tape-casted onto a conducting glass substrate to form thin-films of various thicknesses, thereby avoiding demanding reaction conditions typical of physical depositions, while the other was pressed into pellets. Structural and microstructural features, along with electrical properties and derivative humidity-sensing performance of ceria thin-films and powders pressed into pellets, were studied in detail. Particular attention was given to solid-state impedance spectroscopy (SS-IS), under controlled relative humidity (RH) from 30%–85%, in a wide temperature and frequency range. Moreover, for the thin-film setup, measurements were performed in surface-mode and cross-section-mode. From the results, we extrapolated the influence of composition on relative humidity, the role of configuration and thin-film thickness on electrical properties, and derivative humidity-sensing performance. The structural analysis and depth profiling both point to monophasic crystalline ceria. Microstructure analysis reveals slightly agglomerated spherical particles and thin-films with low surface roughness. Under controlled humidity, the shape of the conductivity spectrum stays the same along with an increase in RH, and a notable shift to higher conductivity values. The relaxation is slow, as the thickness of the pellet slows the return of conductivity values. The increase in humidity has a positive effect on the overall DC conductivity, similar to the temperature effect for semiconducting behavior. As for the surface measurement setup, the thin-film thickness impacts the shape of the spectra and electrical processes. The surface measurement setup turns out to be more sensitive to relative humidity changes, emphasized with higher RH, along with an increase in thin-film thickness. The moisture directly affects the conductivity spectra in the dispersion part, i.e., on the localized short-range charge carriers. Moisture sensitivity is a reversible process for thin-film samples, in contrast to pellet form samples. MDPI 2022-02-02 /pmc/articles/PMC8840404/ /pubmed/35159866 http://dx.doi.org/10.3390/nano12030521 Text en © 2022 by the authors. https://creativecommons.org/licenses/by/4.0/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 (https://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Mandić, Vilko
Bafti, Arijeta
Pavić, Luka
Panžić, Ivana
Kurajica, Stanislav
Pavelić, Jakov-Stjepan
Shi, Zhen
Mužina, Katarina
Ivković, Ivana Katarina
Humidity Sensing Ceria Thin-Films
title Humidity Sensing Ceria Thin-Films
title_full Humidity Sensing Ceria Thin-Films
title_fullStr Humidity Sensing Ceria Thin-Films
title_full_unstemmed Humidity Sensing Ceria Thin-Films
title_short Humidity Sensing Ceria Thin-Films
title_sort humidity sensing ceria thin-films
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8840404/
https://www.ncbi.nlm.nih.gov/pubmed/35159866
http://dx.doi.org/10.3390/nano12030521
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