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Issue 47, 2018
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Low temperature solution synthesis of reduced two dimensional Ti3C2 MXenes with paramagnetic behaviour

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Abstract

MXenes – two dimensional, 2D, early transition metal, M, carbides and nitrides, X – are the latest addition to the 2D materials’ world. Herein, we report on a facile low temperature solution chemical synthesis method to reduce Ti3C2Tx multilayered, ML, MXenes. Using X-ray photoelectron spectroscopy, electron spin resonance, magnetization measurements and other techniques, we concluded that immersing Ti3C2Tx MLs in the reducing agent Li-ethylenediamine (Li-EDA) – held at temperatures varying from room to 120 °C – reduces the 2D layers creating Ti3+ ions and oxygen vacancies. Above a temperature (T) of ≈10 K, the magnetic susceptibilities, χ, are temperature independent, implying that the resulting powders are Pauli paramagnetic. The loss of the magnetic signal upon intercalation of Li+ or EDA, together with a Curie-like increase in χ at T < 10 K, is consistent with that of a disordered metal that is close to a metallic to insulator transition and proves that the magnetism is associated with the 2D flakes. This result is the first evidence of any magnetism of any MXene.

Graphical abstract: Low temperature solution synthesis of reduced two dimensional Ti3C2 MXenes with paramagnetic behaviour

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Publication details

The article was received on 24 Aug 2018, accepted on 02 Nov 2018 and first published on 07 Nov 2018


Article type: Paper
DOI: 10.1039/C8NR06854B
Citation: Nanoscale, 2018,10, 22429-22438

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    Low temperature solution synthesis of reduced two dimensional Ti3C2 MXenes with paramagnetic behaviour

    Y. Yoon, T. A. Le, A. P. Tiwari, I. Kim, M. W. Barsoum and H. Lee, Nanoscale, 2018, 10, 22429
    DOI: 10.1039/C8NR06854B

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