Conduction Mechanisms in Epitaxial NiO/Graphene Gas Sensors
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arXiv
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| Auteurs principaux: | , , , , , , , , , , , |
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| Format: | Preprint |
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2020
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| _version_ | 1866912129062273024 |
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| author | Niavol, Somayeh Saadat Budde, Melanie Papadogianni, Alexandra Heilmann, Martin Moghaddam, Hossain Milani Aldao, Celso M. Ligorio, Giovanni List-Kratochvil, Emil J. W. Lopes, Joao Marcelo J. Barsan, Nicolae Bierwagen, Oliver Schipani, Federico |
| author_facet | Niavol, Somayeh Saadat Budde, Melanie Papadogianni, Alexandra Heilmann, Martin Moghaddam, Hossain Milani Aldao, Celso M. Ligorio, Giovanni List-Kratochvil, Emil J. W. Lopes, Joao Marcelo J. Barsan, Nicolae Bierwagen, Oliver Schipani, Federico |
| contents | Integrated, highly sensitive and reversible sensor devices for toxic and hazardous gases in environmental pollution monitoring can be realized with graphene-based materials. Here we show that, single layer graphene grown on SiC can be utilized to implement sensor devices being extremely sensitive towards NO2 showing an n-type response. A second type of sensor with an added NiO layer on top of the single layer graphene changed its response to p-type but did not reduce its sensitivity. We show that the conduction switch from n-type to p-type was not a consequence of an alteration of the graphene layer but is found to be an effect of the NiO layer. We find that the NiO leads to lowering of the Fermi level to a point that a crossing of the Dirac Point in the graphene switched the conduction type. These sensors were tested in the 100 ppb NO2 regime, showing good response and a detection limit extrapolated to be below 1 ppb. This new NiO/graphene/SiC configuration can be an attractive p-type sub-ppb sensor platform for NO2 and related gases. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2010_02914 |
| institution | arXiv |
| publishDate | 2020 |
| record_format | arxiv |
| spellingShingle | Conduction Mechanisms in Epitaxial NiO/Graphene Gas Sensors Niavol, Somayeh Saadat Budde, Melanie Papadogianni, Alexandra Heilmann, Martin Moghaddam, Hossain Milani Aldao, Celso M. Ligorio, Giovanni List-Kratochvil, Emil J. W. Lopes, Joao Marcelo J. Barsan, Nicolae Bierwagen, Oliver Schipani, Federico Materials Science Integrated, highly sensitive and reversible sensor devices for toxic and hazardous gases in environmental pollution monitoring can be realized with graphene-based materials. Here we show that, single layer graphene grown on SiC can be utilized to implement sensor devices being extremely sensitive towards NO2 showing an n-type response. A second type of sensor with an added NiO layer on top of the single layer graphene changed its response to p-type but did not reduce its sensitivity. We show that the conduction switch from n-type to p-type was not a consequence of an alteration of the graphene layer but is found to be an effect of the NiO layer. We find that the NiO leads to lowering of the Fermi level to a point that a crossing of the Dirac Point in the graphene switched the conduction type. These sensors were tested in the 100 ppb NO2 regime, showing good response and a detection limit extrapolated to be below 1 ppb. This new NiO/graphene/SiC configuration can be an attractive p-type sub-ppb sensor platform for NO2 and related gases. |
| title | Conduction Mechanisms in Epitaxial NiO/Graphene Gas Sensors |
| topic | Materials Science |
| url | https://arxiv.org/abs/2010.02914 |