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Low temperature solution synthesis of reduced two dimensional Ti <sub/>3</sub> C <sub/>2</sub> MXenes with paramagnetic behaviour
摘要： 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 ?akes. This result is the ?rst evidence of any magnetism of any MXene.
关键词： Li-ethylenediamine,MXenes,Ti3C2Tx,paramagnetism,reduction
更新于2025-09-19 17:15:36
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Preparation and magnetic properties for FeSe <sub/><i>x</i> </sub> /Bi <sub/>2</sub> Se <sub/>3</sub> bilayer films on silicon substrates by RF magnetron sputtering
摘要： FeSex/Bi2Se3 bilayer thin films were grown by RF magnetron sputtering on silicon substrates with different thicknesses of Bi2Se3 and the structural, morphological and magnetic properties were investigated. FeSex/Bi2Se3 bilayer films had Bi2Se3 crystallites oriented with c-axis perpendicular to the film plane, and exhibited weak ferromagnetism at low temperature due to the ferromagnetic FeSe2. The thickness of Bi2Se3 layer affected both crystalline structure of Fe–Se layer and the magnetic property.
关键词： magnetic phase,RF magnetron sputtering,paramagnetism,Topological insulator,bilayer films
更新于2025-09-19 17:15:36