Mechanical Exfoliation of Select MAX Phases and Mo 4 Ce 4 Al 7 C 3 Single Crystals to Produce MAXenes
| Autor: | Thierry Ouisse, Simone Lisi, Youngsoo Kim, Michel W. Barsoum, Athanasios Gkountaras, Johann Coraux, Vincent Bouchiat |
|---|---|
| Přispěvatelé: | Laboratoire des matériaux et du génie physique (LMGP ), Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP ), Université Grenoble Alpes (UGA)-Université Grenoble Alpes (UGA), Systèmes hybrides de basse dimensionnalité (HYBRID), Institut Néel (NEEL), Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP ), Université Grenoble Alpes (UGA)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP ), Université Grenoble Alpes (UGA), A.J. Drexel Nanomaterials Institute (Philadelphia, USA), Drexel University |
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Materials science
02 engineering and technology Nitride 010402 general chemistry 01 natural sciences Carbide Biomaterials Two-dimensional systems Electrical resistivity and conductivity Phase (matter) General Materials Science MAX phases Exfoliation Composite material Electric Force Microscopy General Chemistry [CHIM.MATE]Chemical Sciences/Material chemistry 021001 nanoscience & nanotechnology Exfoliation joint Isotropic etching 0104 chemical sciences [PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci] 0210 nano-technology MXenes Biotechnology |
| Zdroj: | Small Small, Wiley-VCH Verlag, 2020, 16 (4), pp.1905784. ⟨10.1002/smll.201905784⟩ |
| ISSN: | 1613-6810 1613-6829 |
| DOI: | 10.1002/smll.201905784⟩ |
| Popis: | International audience; MXenes-two dimensional carbides/nitrides derived from their bulk nanolamellar Mn+1AXn phase counterparts-are, for the most part, obtained by chemical etching. Despite the fact that the M-A bonds in the MAX phases are not weak, in this work we demonstrate that relatively large MAX single crystals can be mechanically exfoliated using the adhesive tape method to produce flakes whose thickness can be reduced down to half a unit cell. The exfoliated flakes, transferred onto SiO2/Si substrates, are analyzed using electric force microscopy, EFM. No appreciable variation in EFM signal with flake thickness is found. EFM contrast between the flakes and SiO2 not only depends on the contact surface potential, but also on the local capacitance. The contribution of the latter can be used to show the metallic character-confirmed by 4-contact resistivity measurements-of even the thinnest of flakes. Because the A-layers are preserved, strictly speaking we are not dealing with MXenes, but rather MAXenes. This is important in the case where the "A" layers contain magnetic elements such as Mo4Ce4Al7C3-whose structure is a derivative of the MAX structure. |
| Databáze: | OpenAIRE |
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