Journal
ADVANCED MATERIALS
Volume 33, Issue 43, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.202103316
Keywords
alcohol; graphene; metal-organic frameworks; sensing; transistors
Categories
Funding
- German Research Foundation (DFG) [KR 3670/3-1]
- Helmholtz Research Program Natural, Artificial and Cognitive Information Processing (NACIP)
- Helmholtz Research Program Materials Systems Engineering (MSE)
- Karlsruhe Nano Micro Facility (KNMF)
- DFG under Germany's Excellence Strategy [2082/1-390761711]
- DFG [WE 1863/29-1]
- Hoch Performance flussig-prozessierte keramische Solarzellen (KeraSolar) - Karlsruhe Institute of Technology (KIT)
- Carl-Zeiss-Stiftung
- Virtual Materials Design Initiative (VirtMat) - KIT
- Projekt DEAL
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Graphene is inherently sensitive to vicinal dielectrics and local charge distributions, and can be used as a sensor; metal-organic frameworks can selectively adsorb specific molecular species; growing a surface-mounted metal-organic framework directly onto graphene field-effect transistors demonstrates a selective ethanol sensor with unprecedented shifts in Dirac point voltage response.
Graphene is inherently sensitive to vicinal dielectrics and local charge distributions, a property that can be probed by the position of the Dirac point in graphene field-effect transistors. Exploiting this as a useful sensing principle requires selectivity; however, graphene itself exhibits no molecule-specific interaction. Complementarily, metal-organic frameworks can be tailored to selective adsorption of specific molecular species. Here, a selective ethanol sensor is demonstrated by growing a surface-mounted metal-organic framework (SURMOF) directly onto graphene field-effect transistors (GFETs). Unprecedented shifts of the Dirac point, as large as 15 V, are observed when the SURMOF/GFET is exposed to ethanol, while a vanishingly small response is observed for isopropanol, methanol, and other constituents of the air, including water. The synthesis and conditioning of the hybrid materials sensor with its functional characteristics are described and a model is proposed to explain the origin, magnitude, and direction of the Dirac point voltage shift. Tailoring multiple SURMOFs to adsorb specific gases on an array of such devices thus generates a versatile, selective, and highly sensitive platform for sensing applications.
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