Contactless Spin Switch Sensing by Chemo‐Electric Gating of Graphene
| Autor: | Grégory F. Schneider, Viorica Tudor, Erik P. van Geest, Sylvestre Bonnet, Wangyang Fu, Khosrow Shakouri, Vincent Robert |
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| Přispěvatelé: | Institut de Chimie de Strasbourg, Université de Strasbourg (UNISTRA)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Centre National de la Recherche Scientifique (CNRS)-Université Louis Pasteur - Strasbourg I-Institut de Chimie du CNRS (INC) |
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Phase transition
Materials science Chemical substance 02 engineering and technology Conductivity 010402 general chemistry 01 natural sciences law.invention Crystal law Spin crossover General Materials Science Spin (physics) chemistry.chemical_classification business.industry Graphene Mechanical Engineering Polymer 021001 nanoscience & nanotechnology 0104 chemical sciences chemistry Mechanics of Materials Optoelectronics 0210 nano-technology business [CHIM.OTHE]Chemical Sciences/Other |
| Zdroj: | Advanced Materials Advanced Materials, Wiley-VCH Verlag, 2020, 32 (10), pp.1903575. ⟨10.1002/adma.201903575⟩ |
| ISSN: | 0935-9648 1521-4095 |
| DOI: | 10.1002/adma.201903575⟩ |
| Popis: | Direct electrical probing of molecular materials is often impaired by their insulating nature. Here, graphene is interfaced with single crystals of a molecular spin crossover complex, [Fe(bapbpy)(NCS)2], to electrically detect phase transitions in the molecular crystal through the variation of graphene resistance. Contactless sensing is achieved by separating the crystal from graphene with an insulating polymer spacer. Next to mechanical effects, which influence the conductivity of the graphene sheet but can be minimized by using a thicker spacer, a Dirac point shift in graphene is observed experimentally upon spin crossover. As confirmed by computational modeling, this Dirac point shift is due to the phase‐dependent electrostatic potential generated by the crystal inside the graphene sheet. This effect, named as chemo‐electric gating, suggests that molecular materials may serve as substrates for designing graphene‐based electronic devices. Chemo‐electric gating, thus, opens up new possibilities to electrically probe chemical and physical processes in molecular materials in a contactless fashion, from a large distance, which can enhance their use in technological applications, for example, as sensors. |
| Databáze: | OpenAIRE |
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