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Synthèse et propriétés de monocristaux, de poudres, films minces ou hétérostructures

Etudes à l'interface avec la matière biologique

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Publication de Yongsoo Kim 2020

Publié le 3 novembre 2020
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Communiqué du 22 octobre 2020 au 21 janvier 2021

L'article intitulé "Elementary processes governing V2AlC chemical etching in HF" a été publié dans RSC Advances

exfoliation

exfoliation

Ici vous trouverez l'article de Youngsoo Kim

"The literature on MXenes, an important class of 2D materials discovered in 2011, is now abundant. Yet, the lack of well-defined structures, with definite crystal orientations, has so far hindered our capability to identify some key aspects ruling MXene's chemical exfoliation from their parent MAX phase. Herein the chemical exfoliation of V2AlC is studied by using well-defined square pillars with lateral sizes from 7 μm up to 500 μm, processed from centimeter-sized V2AlC single crystals. The MXene conversion kinetics are assessed with μm spatial resolution by combining Raman spectroscopy with scanning electron and optical microscopies. HF penetration, and the loss of the Al species, take place through the edges. At room temperature, and on a reasonable time scale, no etching can takes place by HF penetration through the basal planes, viz. normal to the basal planes. In defect-free pillars, etching through the edges is isotropic. Initially the etching rate is linear with a rate of 2.2 ± 0.3 μm h−1 at 25 °C. At a distance of ≈45 μm, the etching rate is greatly diminished"


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mise à jour le 3 novembre 2020

  • Tutelle CNRS
  • Tutelle Grenoble INP
Université Grenoble Alpes