Tran, MH;
Malik, AM;
Dürrschnabel, M;
Regoutz, A;
Thakur, P;
Lee, T-L;
Perera, D;
... Birkel, CS; + view all
(2020)
Experimental and theoretical investigation of the chemical exfoliation of Cr-based MAX phase particles.
Dalton Transactions
, 49
(35)
pp. 12215-12221.
10.1039/d0dt01448f.
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Abstract
Two-dimensional carbides/nitrides, typically called MXenes, are an emerging member of the ever-growing family of two-dimensional materials. The prediction of a ferromagnetic groundstate in chromium-containing MXenes has triggered growing interest in their chemical exfoliation from Cr-based MAX phases. However, the exfoliation poses serious difficulties using standard etching agents such as hydrofluoric acid (HF). Here, we investigate the exfoliability of Cr_{2}GaC particles by chemical etching with aqueous HF both experimentally and theoretically. Structural and microstructural analyses show that the Cr_{2} GaC particles decompose into chromium carbide and oxide without the formation of a Cr-based MXene. A thermodynamic analysis based on ab initio electronic structure calculations reveals that the exfoliation of Cr-based MXene from Cr_{2} GaC by HF-etching is inhibited by more favorable competing reactions. This result confirms the experimental finding and suggests that HF is an unsuitable etching agent for a successful exfoliation of Cr_{2}GaC.
| Type: | Article |
|---|---|
| Title: | Experimental and theoretical investigation of the chemical exfoliation of Cr-based MAX phase particles |
| Location: | England |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1039/d0dt01448f |
| Publisher version: | https://doi.org/10.1039/D0DT01448F |
| Language: | English |
| Additional information: | This version is the author accepted manuscript. For information on re-use, please refer to the publisher's terms and conditions. |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Chemistry |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10108596 |
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