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Issue 41, 2017
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A new etching environment (FeF3/HCl) for the synthesis of two-dimensional titanium carbide MXenes: a route towards selective reactivity vs. water

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Abstract

The synthesis of Ti3C2Tx (and Ti2CTx alike) MXenes is performed with a new etching environment (FeF3/HCl). Significant differences in terms of surface functionalization (including the insertion of iron cations between the MXene sheets), morphology, nature of impurities, water intercalation and reactivity are obtained in comparison with samples prepared by conventional HF or LiF/HCl etching methods. In particular, the new synthesis method allows modifying the reactivity of Ti3C2vs. water with improved selectivity towards the formation of TiO2 anatase nanoparticles on the MXene sheets whereas rutile TiO2 nanoparticles are favoured by the LiF/HCl method. The role of the Fen+ and Al3+ cations inherent to this synthesis process in the inhibition of the anatase to rutile transformation is shown to be a key parameter. In addition, the MXene oxidation rate in water is also increased when the material is prepared with FeF3/HCl compared to the LiF/HCl method owing to the surface modification of the MXene during the etching step. This oxidation rate can easily be tuned by adjusting the duration of immersion. This work expands the number of etching methods to form MXenes while offering new opportunities in the rationalized design of MXene@TiO2 nanocomposite structures for future applications.

Graphical abstract: A new etching environment (FeF3/HCl) for the synthesis of two-dimensional titanium carbide MXenes: a route towards selective reactivity vs. water

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Publication details

The article was received on 03 Feb 2017, accepted on 27 Sep 2017 and first published on 27 Sep 2017


Article type: Paper
DOI: 10.1039/C7TA01082F
Citation: J. Mater. Chem. A, 2017,5, 22012-22023
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    A new etching environment (FeF3/HCl) for the synthesis of two-dimensional titanium carbide MXenes: a route towards selective reactivity vs. water

    X. Wang, C. Garnero, G. Rochard, D. Magne, S. Morisset, S. Hurand, P. Chartier, J. Rousseau, T. Cabioc'h, C. Coutanceau, V. Mauchamp and S. Célérier, J. Mater. Chem. A, 2017, 5, 22012
    DOI: 10.1039/C7TA01082F

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