Ethanol gas sensing mechanisms of p-type NiO at room temperature
Conductometric gas sensors based on metal oxide semiconductors (MOS) usually require high temperature operation, increasing their energy consumption and limiting their applicability. However, room temperature operation with these devices still remains a challenge in many sensor-analyte systems due i...
| Authors: | ; ; ; ; |
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| Format: | Article |
| Publication date: | 2021 |
| Country: | España |
| Institution: | Universidad Autónoma de Madrid |
| Repository: | Biblos-e Archivo. Repositorio Institucional de la UAM |
| Language: | English |
| OAI Identifier: | oai:repositorio.uam.es:10486/704503 |
| Online Access: | http://hdl.handle.net/10486/704503 https://dx.doi.org/10.1016/j.apsusc.2021.152134 |
| Access Level: | Open access |
| Keyword: | Adsorption Charge transfer Conductometric gas sensing Electron backscattered diffraction Nickel oxide Física |
| _version_ | 1878733619686539264 |
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| author | Bartolomé Vílchez, Javier |
| author2 | Taeño, María Martínez-Casado, Ruth Maestre, David Cremades, Ana |
| author2_role | author author author author |
| author_browse | Bartolomé Vílchez, Javier Cremades, Ana Maestre, David Martínez-Casado, Ruth Taeño, María |
| author_facet | Bartolomé Vílchez, Javier Taeño, María Martínez-Casado, Ruth Maestre, David Cremades, Ana |
| author_role | author |
| collection | Biblos-e Archivo. Repositorio Institucional de la UAM |
| description | Conductometric gas sensors based on metal oxide semiconductors (MOS) usually require high temperature operation, increasing their energy consumption and limiting their applicability. However, room temperature operation with these devices still remains a challenge in many sensor-analyte systems due in part to the low or null response and recovery speeds obtained at this temperature. In this work, the conductometric response of p-type NiO ceramic samples to ethanol is studied under room temperature operation. An anomalous response consisting in an unexpected resistance decrease upon ethanol exposure is observed depending on sample texturing, which is tuned by changing the temperature at which the samples are synthesized. This anomalous response is characterized by fast response and recovery times. A model based on two competing mechanisms, consisting in either an electron transfer from NiO to the ethanol molecule or the catalytic decomposition of adsorbed ethanol, is proposed to explain the observed anomalous response. Extending this model to other MOS could pave the way for fast sensors operating at room temperature |
| eu_rights_str_mv | openAccess |
| format | article |
| id | ES_59b1b5d2cdb30900f40bd32e0df909af |
| institution | Universidad Autónoma de Madrid |
| instname_str | Universidad Autónoma de Madrid |
| language | eng |
| network_acronym_str | ES |
| network_name_str | España |
| oai_identifier_str | oai:repositorio.uam.es:10486/704503 |
| publishDate | 2021 |
| publishDateSort | 2021 |
| publisher | Elsevier |
| publisherStr | Elsevier |
| reponame_str | Biblos-e Archivo. Repositorio Institucional de la UAM |
| spelling | Ethanol gas sensing mechanisms of p-type NiO at room temperature Bartolomé Vílchez, Javier Taeño, María Martínez-Casado, Ruth Maestre, David Cremades, Ana Adsorption Charge transfer Conductometric gas sensing Electron backscattered diffraction Nickel oxide Física Conductometric gas sensors based on metal oxide semiconductors (MOS) usually require high temperature operation, increasing their energy consumption and limiting their applicability. However, room temperature operation with these devices still remains a challenge in many sensor-analyte systems due in part to the low or null response and recovery speeds obtained at this temperature. In this work, the conductometric response of p-type NiO ceramic samples to ethanol is studied under room temperature operation. An anomalous response consisting in an unexpected resistance decrease upon ethanol exposure is observed depending on sample texturing, which is tuned by changing the temperature at which the samples are synthesized. This anomalous response is characterized by fast response and recovery times. A model based on two competing mechanisms, consisting in either an electron transfer from NiO to the ethanol molecule or the catalytic decomposition of adsorbed ethanol, is proposed to explain the observed anomalous response. Extending this model to other MOS could pave the way for fast sensors operating at room temperature Elsevier http://hdl.handle.net/10486/704503 https://dx.doi.org/10.1016/j.apsusc.2021.152134 |
| spellingShingle | Ethanol gas sensing mechanisms of p-type NiO at room temperature Bartolomé Vílchez, Javier Adsorption Charge transfer Conductometric gas sensing Electron backscattered diffraction Nickel oxide Física |
| title | Ethanol gas sensing mechanisms of p-type NiO at room temperature |
| title_full | Ethanol gas sensing mechanisms of p-type NiO at room temperature |
| title_fullStr | Ethanol gas sensing mechanisms of p-type NiO at room temperature |
| title_full_unstemmed | Ethanol gas sensing mechanisms of p-type NiO at room temperature |
| title_short | Ethanol gas sensing mechanisms of p-type NiO at room temperature |
| title_sort | Ethanol gas sensing mechanisms of p-type NiO at room temperature |
| topic | Adsorption Charge transfer Conductometric gas sensing Electron backscattered diffraction Nickel oxide Física |
| topic_facet | Adsorption Charge transfer Conductometric gas sensing Electron backscattered diffraction Nickel oxide Física |
| url | http://hdl.handle.net/10486/704503 https://dx.doi.org/10.1016/j.apsusc.2021.152134 |