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Physical properties, such as electrochemical and electromagnetic properties, of two-dimensional MXenes can be improved by enhancing their stability. However, MXenes fabricated via acid etching contain defects, which affect their physical properties. In this study, a method to effectively remove Al residues using only water during MXene fabrication while maintaining structural stability is proposed. The fabrication and intercalation of MXenes are controlled via epitaxial self-intercalation of H2O-etched Cr2(AlLi)C. On the basis of this mechanism, the room-temperature ferromagnetism of two-dimensional few-layered Cr2CTx MXenes, which has a specific saturation magnetization of ~0.26 emu/g and a Curie temperature of > 353 K, is experimentally verified. The calculated electronic band structure implies that the semimetal Cr2CTx MXene has a band gap of 0.75 eV. This study opens new possibilities for the research and applications of industrial-scale manufacturing of MXenes and 2D semiconductors.
Ghidiu M, Lukatskaya MR, Zhao MQ, et al. Conductive two-dimensional titanium carbide ‘clay’ with high volumetric capacitance. Nature 2014, 516: 78–81.
Feng A, Yu Y, Jiang F, et al. Fabrication and thermal stability of NH4HF2-etched Ti3C2 MXene. Ceram Int 2017, 43: 6322–6328.
Li Y, Shao H, Lin Z, et al. A general Lewis acidic etching route for preparing MXenes with enhanced electrochemical performance in non-aqueous electrolyte. Nat Mater 2020, 19: 894–899.
Pang SY, Wong YT, Yuan S, et al. Universal strategy for HF-free facile and rapid synthesis of two-dimensional MXenes as multifunctional energy materials. J Am Chem Soc 2019, 141: 9610–9616.
Lei D, Benson J, Magasinski A, et al. Transformation of bulk alloys to oxide nanowires. Science 2017, 355: 267–271.
Yu J, Yu F, Yuen MF, et al. Two-dimensional layered double hydroxides as a platform for electrocatalytic oxygen evolution. J Mater Chem A 2021, 9: 9389–9430.
Wang W, Jiang D, Chen X, et al. A sandwich-like nano-micro LDH-MXene-LDH for high-performance supercapacitors. Appl Surf Sci 2020, 515: 145982.
Drucker NC, Nguyen T, Han F, et al. Topology stabilized fluctuations in a magnetic nodal semimetal. Nat Commun 2023, 14: 5182.
Si C, Zhou J, Sun ZM. Half-metallic ferromagnetism and surface functionalization-induced metal–insulator transition in graphene-like two-dimensional Cr2C crystals. ACS Appl Mater Interfaces 2015, 7: 17510–17515.
Meng W, Zhang X, Liu Y, et al. Two-dimensional Weyl semimetal with coexisting fully spin-polarized type-I and type-II Weyl points. Appl Surf Sci 2021, 540: 148318.
De Groot RA, Mueller FM, van Engen PG, et al. New class of materials: half-metallic ferromagnets. Phys Rev Lett 1983, 50: 2024–2027.
Tan H, Wang C, Duan H, et al. Intrinsic room-temperature ferromagnetism in V2C MXene nanosheets. ACS Appl Mater Inter 2021, 13: 33363–33370.
Zhao X, Song P, Wang C, et al. Engineering covalently bonded 2D layered materials by self-intercalation. Nature 2020, 581: 171–177.
Chen G., Sharpe AL, Fox EJ, et al. Tunable correlated Chern insulator and ferromagnetism in a moiré superlattice. Nature 2020, 579: 56–61.
Song T, Sun Q, Anderson E, et al. Direct visualization of magnetic domains and moiré magnetism in twisted 2D magnets. Science 2021, 374: 1140–1144.
Wimmer S, Sánchez BJ, Küppers P, et al. Mn-rich MnSb2Te4: A topological insulator with magnetic gap closing at high Curie temperatures of 45–50 K. Adv Mater 2021, 33: 2102935.
Ghosh A, Dey K, Sabyasachi S, et al. Colossal magnetocapacitance near room temperature in ferromagnetic Cr2O3 film. Appl Phys Lett 2013, 103: 052412.
Li Y, Qing Y, Zhang Y, et al. Simultaneously tuning structural defects and crystal phase in accordion-like Ti x O2 x −1 derived from Ti3C2T x MXene for enhanced electromagnetic attenuation. J Adv Ceram 2023, 12: 1946–1960.
Mashtalir O, Naguib M, Mochalin VN, et al. Intercalation and delamination of layered carbides and carbonitrides. Nat Commun 2013, 4: 1716.
Mermin ND, Wagner H. Absence of ferromagnetism or antiferromagnetism in one- or two-dimensional isotropic Heisenberg models. Phys Rev Lett 1966, 17: 1133–1136.
Gong C, Li L, Li Z, et al. Discovery of intrinsic ferromagnetism in two-dimensional van der Waals crystals. Nature 2017, 546: 265–269.
Huang B, Clark G, Navarro-Moratalla E, et al. Layer-dependent ferromagnetism in a van der Waals crystal down to the monolayer limit. Nature 2017, 546: 270.
Zhang S, Cao C, Su S, et al. Anisotropic exchange coupling interaction between hard-hard magnetic grains in sintered SrFe12O19 ferrites. J Adv Ceram 2023, 12: 815–821.
Deng Y, Yu Y, Song Y, et al. Gate-tunable room-temperature ferromagnetism in two-dimensional Fe3GeTe2. Nature 2018, 563: 94–99.
Bonilla M, Kolekar S, Ma Y, et al. Strong room-temperature ferromagnetism in VSe2 monolayers on van der Waals substrates. Nat Nanotechnol 2018, 13: 289–293.
Gong C, Zhang X. Two-dimensional magnetic crystals and emergent heterostructure devices. Science 2019, 363: eaav4450.
Mullan C, Slizovskiy S, Yin J et al. Mixing of moiré-surface and bulk states in graphite. Nature 2023, 620: 756–761.
Frey N, Bandyopadhyay A, Kumar H, et al. Surface-engineered MXenes: Electric field control of magnetism and enhanced magnetic anisotropy. ACS Nano 2019, 13: 2831–2839.
Khazaei M, Arai M, Sasaki T, et al. Novel electronic and magnetic properties of two-dimensional transition metal carbides and nitrides. Adv Funct Mater 2013, 23: 2185–2192.
Ding H, Li Y, Li M, et al. Chemical scissor-mediated structural editing of layered transition metal carbides. Science 2023, 379: 1130–1135.
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