Journal
NANOSCALE
Volume 10, Issue 47, Pages 22429-22438Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c8nr06854b
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Funding
- Institute for Basic Science [IBS-R011-D1]
- National Research Foundation of Korea (NRF) [NRF-2017R1A6A3A11033347]
- Swedish Research Council [621-2014-4890]
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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 degrees C - reduces the 2D layers creating Ti3+ ions and oxygen vacancies. Above a temperature (T) of approximate to 10 K, the magnetic susceptibilities, , 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 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.
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