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Synthesis of two-dimensional molybdenum carbide, Mo2C, from the gallium based atomic laminate Mo2Ga2C
Linköping University, Department of Physics, Chemistry and Biology, Thin Film Physics. Linköping University, Faculty of Science & Engineering.
Linköping University, Department of Physics, Chemistry and Biology, Thin Film Physics. Linköping University, Faculty of Science & Engineering.
Department of Materials Science & Engineering, Drexel University, Philadelphia, USA.
Linköping University, Department of Physics, Chemistry and Biology, Thin Film Physics. Linköping University, Faculty of Science & Engineering.
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2015 (English)In: Scripta Materialia, ISSN 1359-6462, E-ISSN 1872-8456, Vol. 108, 147-150 p.Article in journal (Refereed) Published
Abstract [en]

We report on the synthesis of a two-dimensional transition metal carbide, Mo2C, (MXene) obtained by immersing Mo2Ga2C thin films in hydrofluoric acid. Experimental evidences for neither synthesis of a Mo-based MXene nor selective etching of Ga from an atomic nanolaminate have previously been presented. MXene formation is verified through X-ray diffraction, transmission electron microscopy, and energy dispersive X-ray spectroscopy. This discovery unlocks new potential applications for Mo-based MXenes in a host of applications, from thermoelectrics to catalysis and energy storage.

Place, publisher, year, edition, pages
Elsevier, 2015. Vol. 108, 147-150 p.
Keyword [en]
2D materials, Layered structures, MXene, Transmission electron microscopy (TEM), Energy dispersive X-ray spectroscopy (EDS)
National Category
Physical Sciences
URN: urn:nbn:se:liu:diva-121255DOI: 10.1016/j.scriptamat.2015.07.003ISI: 000360250700035OAI: diva2:852829
Available from: 2015-09-10 Created: 2015-09-10 Last updated: 2015-09-29Bibliographically approved
In thesis
1. Synthesis and characterization of Mo-based nanolaminates
Open this publication in new window or tab >>Synthesis and characterization of Mo-based nanolaminates
2015 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

Mn+1AXn (MAX) phases are nanolaminated compounds based on a transition metal (M), a group A element (A), and carbon or/and nitrogen (X), which exhibit a unique combination of ceramic and metallic properties. Mo-based MAX phases are among the least studied, despite indication of superconducting properties and high potential for fabrication of the grapheneanalogous 2D counterpart, Mo2C MXene. Furthermore, incorporation of Mn atoms in these MAX phases may induce a magnetic response.

In this work, I have performed theoretical calculations focused on evaluation of phase stability of the Mon+1GaCn MAX phases, and have synthesized the predicted stable Mo2GaC in thin film form using magnetron sputtering. Close to phase pure epitaxial films were grown at ~590 ºC, and electrical resistivity measurements using a four point probe technique suggest a superconducting behavior with a critical temperature of ~7 K.

The A-layer in the MAX phase can be selectively etched using different types of acids, leading to exfoliation of the MX-layers and realization of MXenes. After synthesis of the MAX phase related material Mo2Ga2C, the previously non-explored Mo2C MXene could be fabricated from etching Mo2Ga2C thin films in 50% hydrofluoric acid at a temperature of ~50 ºC for a duration of ~3 h.

Motivated by the realization of laminated Mo-based materials in 3D as well as 2D, I set out to explore the magnetic properties resulting from Mn-alloying of the non-magnetic Mo2GaC phase. For that purpose, (Mo,Mn)2GaC was synthesized using a DC magnetron sputtering system with Ga and C as elemental targets and a 1:1 atomic ratio Mo:Mn compound target. Heteroepitaxial films on MgO(111) substrates were grown at ~530 ºC, as confirmed by X-ray diffraction. Compositional analysis using energy dispersive X-ray spectroscopy showed a 2:1 ratio of the M and A elements and a 1:1 ratio for the Mo and Mn atoms in the film. Vibrating sample magnetometry was utilized in order to measure the magnetic behavior of the films, showing a magnetic response up to at least 300 K, and with a coercive field of 0.06 T, which is the highest reported for any MAX phase to date.

Place, publisher, year, edition, pages
Linköping: Linköping University Electronic Press, 2015. 37 p.
Linköping Studies in Science and Technology. Thesis, ISSN 0280-7971 ; 1729
National Category
Physical Sciences Physical Chemistry
urn:nbn:se:liu:diva-121262 (URN)978-91-7685-948-3 (print) (ISBN)
2015-10-09, Planck, Fysikhuset, Campus Valla, Linköpings universitet, Linköping, 10:15 (English)

The series name Linköping Studies in Science and Technology Licentiate Thesis is incorrect. The correct series name is Linköping Studies in Science and Technology Thesis.

Available from: 2015-09-11 Created: 2015-09-10 Last updated: 2015-09-11Bibliographically approved

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