Influence of morphology and heterostructure formation on the NO₂ gas sensing properties of the ZnO-NiO system
The detection of toxic gases has gained significant attention in recent decades. Among various gas-sensing materials, metal oxide semiconductors (MOS) have emerged as highly promising due to their exceptional physical and chemical properties. However, a major limitation of MOS-based gas sensors is t...
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Elsevier
2024-12-01
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2666831924001024 |
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| author | Julia Coelho Tagliaferro Amanda Akemy Komorizono Natalia Candiani Simões Pessoa Rayssa Silva Correia Maria Ines Basso Bernardi Valmor Roberto Mastelaro |
| author_facet | Julia Coelho Tagliaferro Amanda Akemy Komorizono Natalia Candiani Simões Pessoa Rayssa Silva Correia Maria Ines Basso Bernardi Valmor Roberto Mastelaro |
| author_sort | Julia Coelho Tagliaferro |
| collection | DOAJ |
| description | The detection of toxic gases has gained significant attention in recent decades. Among various gas-sensing materials, metal oxide semiconductors (MOS) have emerged as highly promising due to their exceptional physical and chemical properties. However, a major limitation of MOS-based gas sensors is their lack of specificity, as they often respond to multiple gases, complicating the identification of target gases in mixed environments. This challenge can be addressed by combining two or more MOS materials to form a heterojunction, which modifies the electronic structure and enhances selectivity. NiO, a p-type semiconductor, has demonstrated the ability to improve both selectivity and sensor response when combined with ZnO, an n-type semiconductor. In this study, ZnO particles were synthesized via a precipitation method to produce two distinct morphologies: needle- and donut-like. These ZnO particles were subsequently combined with NiO via a hydrothermal reaction to form an n-p heterojunction. The selectivity of the resulting sensors was evaluated against O₃, NO₂, NH₃, and CO gases. The results indicated that ZnO sensors with needle- and donut-like morphologies exhibited high responses to oxidizing gases but lacked adequate selectivity between them. In contrast, the ZnO/NiO donut-like heterostructure demonstrated high selectivity for NO₂ detection. |
| format | Article |
| id | doaj-art-5614261e02b34783b3953d77cdb6b216 |
| institution | Kabale University |
| issn | 2666-8319 |
| language | English |
| publishDate | 2024-12-01 |
| publisher | Elsevier |
| record_format | Article |
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| spelling | doaj-art-5614261e02b34783b3953d77cdb6b2162024-12-13T11:06:15ZengElsevierTalanta Open2666-83192024-12-0110100388Influence of morphology and heterostructure formation on the NO₂ gas sensing properties of the ZnO-NiO systemJulia Coelho Tagliaferro0Amanda Akemy Komorizono1Natalia Candiani Simões Pessoa2Rayssa Silva Correia3Maria Ines Basso Bernardi4Valmor Roberto Mastelaro5Institute of Physics of São Carlos, University of São Paulo, 13566-590, São Carlos, SP, BrazilInstitute of Physics of São Carlos, University of São Paulo, 13566-590, São Carlos, SP, BrazilInstitute of Physics of São Carlos, University of São Paulo, 13566-590, São Carlos, SP, BrazilInstitute of Physics of São Carlos, University of São Paulo, 13566-590, São Carlos, SP, BrazilInstitute of Physics of São Carlos, University of São Paulo, 13566-590, São Carlos, SP, BrazilCorresponding author.; Institute of Physics of São Carlos, University of São Paulo, 13566-590, São Carlos, SP, BrazilThe detection of toxic gases has gained significant attention in recent decades. Among various gas-sensing materials, metal oxide semiconductors (MOS) have emerged as highly promising due to their exceptional physical and chemical properties. However, a major limitation of MOS-based gas sensors is their lack of specificity, as they often respond to multiple gases, complicating the identification of target gases in mixed environments. This challenge can be addressed by combining two or more MOS materials to form a heterojunction, which modifies the electronic structure and enhances selectivity. NiO, a p-type semiconductor, has demonstrated the ability to improve both selectivity and sensor response when combined with ZnO, an n-type semiconductor. In this study, ZnO particles were synthesized via a precipitation method to produce two distinct morphologies: needle- and donut-like. These ZnO particles were subsequently combined with NiO via a hydrothermal reaction to form an n-p heterojunction. The selectivity of the resulting sensors was evaluated against O₃, NO₂, NH₃, and CO gases. The results indicated that ZnO sensors with needle- and donut-like morphologies exhibited high responses to oxidizing gases but lacked adequate selectivity between them. In contrast, the ZnO/NiO donut-like heterostructure demonstrated high selectivity for NO₂ detection.http://www.sciencedirect.com/science/article/pii/S2666831924001024Metal oxide semiconductorsGas sensorsHeterostructured materialsNO2 detection |
| spellingShingle | Julia Coelho Tagliaferro Amanda Akemy Komorizono Natalia Candiani Simões Pessoa Rayssa Silva Correia Maria Ines Basso Bernardi Valmor Roberto Mastelaro Influence of morphology and heterostructure formation on the NO₂ gas sensing properties of the ZnO-NiO system Talanta Open Metal oxide semiconductors Gas sensors Heterostructured materials NO2 detection |
| title | Influence of morphology and heterostructure formation on the NO₂ gas sensing properties of the ZnO-NiO system |
| title_full | Influence of morphology and heterostructure formation on the NO₂ gas sensing properties of the ZnO-NiO system |
| title_fullStr | Influence of morphology and heterostructure formation on the NO₂ gas sensing properties of the ZnO-NiO system |
| title_full_unstemmed | Influence of morphology and heterostructure formation on the NO₂ gas sensing properties of the ZnO-NiO system |
| title_short | Influence of morphology and heterostructure formation on the NO₂ gas sensing properties of the ZnO-NiO system |
| title_sort | influence of morphology and heterostructure formation on the no₂ gas sensing properties of the zno nio system |
| topic | Metal oxide semiconductors Gas sensors Heterostructured materials NO2 detection |
| url | http://www.sciencedirect.com/science/article/pii/S2666831924001024 |
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