Conduction mechanisms in epitaxial NiO/Graphene gas sensors

SENSORS AND ACTUATORS B-CHEMICAL

卷:325

Article

Niavol, Somayeh Saadat^1,2  Budde, Melanie²  Papadogianni, Alexandra²  Heilmann, Martin²  Moghaddam, Hossain Milani¹  Aldao, Celso M.³  Ligorio, Giovanni^4,5  List-Kratochvil, Emil J. W.^4,5,6  Lopes, Joao Marcelo J.²  Barsan, Nicolae⁷  Bierwagen, Oliver²  Schipani, Federico^3,7 

[1] Univ Mazandaran, Dept Solid State Phys, Babolsar 4741695447, Iran

[2] Leibniz Inst Forsch Verbund Berlin eV, Paul Drude Inst Festkorperelekt, Hausvogteipl 5-7, D-10117 Berlin, Germany

[3] Inst Mat Sci & Technol INTEMA, Ave Colon 10850, RA-7600 Mar Del Plata, Argentina

[4] Humboldt Univ, Inst Phys, Inst Chem, Brook Taylor Str 6, D-12489 Berlin, Germany

[5] Humboldt Univ, IRIS, Brook Taylor Str 6, D-12489 Berlin, Germany

[6] Helmholtz Zentrum Mat & Energie GmbH, Brook Taylor Str 6, D-12489 Berlin, Germany

[7] Eberhard Karls Univ Tubingen, Inst Phys Chem, Morgenstelle 15, D-72076 Tubingen, Germany

关键词: Graphene;    Epitaxial;    NO2;    NiO;    Detection limit;    Conduction mechanisms;    Gas sensor;   

DOI  :  10.1016/j.snb.2020.128797

来源: Elsevier

【 摘 要 】

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.

【 授权许可】

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