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Ultraviolet Photoactivated Room Temperature NO(2) Gas Sensor of ZnO Hemitubes and Nanotubes Covered with TiO(2) Nanoparticles

Prolonged exposure to NO(2) can cause lung tissue inflammation, bronchiolitis fibrosa obliterans, and silo filler’s disease. In recent years, nanostructured semiconducting metal oxides have been widely used to fabricate gas sensors because of their unique structure and surface-to-volume ratio compar...

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Autores principales: Choi, Hee-Jung, Kwon, Soon-Hwan, Lee, Won-Seok, Im, Kwang-Gyun, Kim, Tae-Hyun, Noh, Beom-Rae, Park, Sunghoon, Oh, Semi, Kim, Kyoung-Kook
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2020
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7153620/
https://www.ncbi.nlm.nih.gov/pubmed/32143528
http://dx.doi.org/10.3390/nano10030462
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author Choi, Hee-Jung
Kwon, Soon-Hwan
Lee, Won-Seok
Im, Kwang-Gyun
Kim, Tae-Hyun
Noh, Beom-Rae
Park, Sunghoon
Oh, Semi
Kim, Kyoung-Kook
author_facet Choi, Hee-Jung
Kwon, Soon-Hwan
Lee, Won-Seok
Im, Kwang-Gyun
Kim, Tae-Hyun
Noh, Beom-Rae
Park, Sunghoon
Oh, Semi
Kim, Kyoung-Kook
author_sort Choi, Hee-Jung
collection PubMed
description Prolonged exposure to NO(2) can cause lung tissue inflammation, bronchiolitis fibrosa obliterans, and silo filler’s disease. In recent years, nanostructured semiconducting metal oxides have been widely used to fabricate gas sensors because of their unique structure and surface-to-volume ratio compared to layered materials. In particular, the different morphologies of ZnO-based nanostructures significantly affect the detection property of NO(2) gas sensors. However, because of the large interaction energy of chemisorption (1–10 eV), metal oxide-based gas sensors are typically operated above 100 °C, overcoming the energy limits to attain high sensitivity and fast reaction. High operating temperature negatively affects the reliability and durability of semiconductor-based sensors; at high temperature, the diffusion and sintering effects at the metal oxide grain boundaries are major factors causing undesirable long-term drift problems and preventing stability improvements. Therefore, we demonstrate NO(2) gas sensors consisting of ZnO hemitubes (HTs) and nanotubes (NTs) covered with TiO(2) nanoparticles (NPs). To operate the gas sensor at room temperature (RT), we measured the gas-sensing properties with ultraviolet illumination onto the active region of the gas sensor for photoactivation instead of conventional thermal activation by heating. The performance of these gas sensors was enhanced by the change of barrier potential at the ZnO/TiO(2) interfaces, and their depletion layer was expanded by the NPs formation. The gas sensor based on ZnO HTs showed 1.2 times higher detection property than those consisting of ZnO NTs at the 25 ppm NO(2) gas.
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spelling pubmed-71536202020-04-20 Ultraviolet Photoactivated Room Temperature NO(2) Gas Sensor of ZnO Hemitubes and Nanotubes Covered with TiO(2) Nanoparticles Choi, Hee-Jung Kwon, Soon-Hwan Lee, Won-Seok Im, Kwang-Gyun Kim, Tae-Hyun Noh, Beom-Rae Park, Sunghoon Oh, Semi Kim, Kyoung-Kook Nanomaterials (Basel) Article Prolonged exposure to NO(2) can cause lung tissue inflammation, bronchiolitis fibrosa obliterans, and silo filler’s disease. In recent years, nanostructured semiconducting metal oxides have been widely used to fabricate gas sensors because of their unique structure and surface-to-volume ratio compared to layered materials. In particular, the different morphologies of ZnO-based nanostructures significantly affect the detection property of NO(2) gas sensors. However, because of the large interaction energy of chemisorption (1–10 eV), metal oxide-based gas sensors are typically operated above 100 °C, overcoming the energy limits to attain high sensitivity and fast reaction. High operating temperature negatively affects the reliability and durability of semiconductor-based sensors; at high temperature, the diffusion and sintering effects at the metal oxide grain boundaries are major factors causing undesirable long-term drift problems and preventing stability improvements. Therefore, we demonstrate NO(2) gas sensors consisting of ZnO hemitubes (HTs) and nanotubes (NTs) covered with TiO(2) nanoparticles (NPs). To operate the gas sensor at room temperature (RT), we measured the gas-sensing properties with ultraviolet illumination onto the active region of the gas sensor for photoactivation instead of conventional thermal activation by heating. The performance of these gas sensors was enhanced by the change of barrier potential at the ZnO/TiO(2) interfaces, and their depletion layer was expanded by the NPs formation. The gas sensor based on ZnO HTs showed 1.2 times higher detection property than those consisting of ZnO NTs at the 25 ppm NO(2) gas. MDPI 2020-03-04 /pmc/articles/PMC7153620/ /pubmed/32143528 http://dx.doi.org/10.3390/nano10030462 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
Choi, Hee-Jung
Kwon, Soon-Hwan
Lee, Won-Seok
Im, Kwang-Gyun
Kim, Tae-Hyun
Noh, Beom-Rae
Park, Sunghoon
Oh, Semi
Kim, Kyoung-Kook
Ultraviolet Photoactivated Room Temperature NO(2) Gas Sensor of ZnO Hemitubes and Nanotubes Covered with TiO(2) Nanoparticles
title Ultraviolet Photoactivated Room Temperature NO(2) Gas Sensor of ZnO Hemitubes and Nanotubes Covered with TiO(2) Nanoparticles
title_full Ultraviolet Photoactivated Room Temperature NO(2) Gas Sensor of ZnO Hemitubes and Nanotubes Covered with TiO(2) Nanoparticles
title_fullStr Ultraviolet Photoactivated Room Temperature NO(2) Gas Sensor of ZnO Hemitubes and Nanotubes Covered with TiO(2) Nanoparticles
title_full_unstemmed Ultraviolet Photoactivated Room Temperature NO(2) Gas Sensor of ZnO Hemitubes and Nanotubes Covered with TiO(2) Nanoparticles
title_short Ultraviolet Photoactivated Room Temperature NO(2) Gas Sensor of ZnO Hemitubes and Nanotubes Covered with TiO(2) Nanoparticles
title_sort ultraviolet photoactivated room temperature no(2) gas sensor of zno hemitubes and nanotubes covered with tio(2) nanoparticles
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7153620/
https://www.ncbi.nlm.nih.gov/pubmed/32143528
http://dx.doi.org/10.3390/nano10030462
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