Synthesis of Mo4VAlC4 MAX Phase and Two-Dimensional Mo4VC4 MXene with Five Atomic Layers of Transition Metals Article Swipe

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Grayson Deysher , Christopher E. Shuck , Kanit Hantanasirisakul , Nathan C. Frey , Alexandre C. Foucher , Kathleen Maleski , Asia Sarycheva , Vivek B. Shenoy , Eric A. Stach , Babak Anasori , Yury Gogotsi · YOU? · · 2023 · Open Access · · DOI: https://doi.org/10.1201/9781003306511-8

MXenes are a family of two-dimensional (2D) transition\nmetal carbides,\nnitrides, and carbonitrides with a general formula of M_n+1X_nT_x, in which two, three, or four atomic layers of a transition\nmetal (M: Ti, Nb, V, Cr, Mo, Ta, etc.) are interleaved with layers\nof C and/or N (shown as X), and T_x represents\nsurface termination groups such as −OH, O, and −F.\nHere, we report the scalable synthesis and characterization of a MXene\nwith five atomic layers of transition metals (Mo₄VC₄T_x), by synthesizing its Mo₄VAlC₄ MAX phase precursor that contains no other\nMAX phase impurities. These phases display twinning at their central\nM layers which is not present in any other known MAX phases or MXenes.\nTransmission electron microscopy and X-ray diffraction were used to\nexamine the structure of both phases. Energy-dispersive X-ray spectroscopy,\nX-ray photoelectron spectroscopy, Raman spectroscopy, and high-resolution\nscanning transmission electron microscopy with energy-dispersive X-ray\nspectroscopy were used to study the composition of these materials.\nDensity functional theory calculations indicate that other five transition\nmetal-layer MAX phases (M′₄M″AlC₄) may be possible, where M′ and M″ are two different\ntransition metals. The predicted existence of additional Al-containing\nMAX phases suggests that more M₅C₄T_x MXenes can be synthesized. Additionally, we characterized\nthe optical, electronic, and thermal properties of Mo₄VC₄T_x. This study demonstrates the\nexistence of an additional subfamily of M₅X₄T_x MXenes as well as a twinned structure,\nallowing for a wider range of 2D structures and compositions for more\ncontrol over properties, which could lead to many different applications.

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book-chapter

Language

en

Landing Page

https://doi.org/10.1201/9781003306511-8

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green

Cited By

12

Related Works

10

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https://openalex.org/W4380052860

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