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An asymmetrically out-of-plane ordered MAX phase as a precursor for Janus MXenes.
Minseok Lee1,2, Hyun Woo Seong1,3, Ho Jin Ryu4,5
1Department of Nuclear and Quantum Engineering, Korea Advanced Institute of Science and Technology (KAIST), Daejeon, Republic of Korea.
Nature Communications
|April 30, 2026
Summary
Researchers developed a new MAX phase precursor, (Ti3/11Zr2/11Hf3/11Ta3/11)3(Al2/3Sn1/3)C2, enabling the synthesis of Janus MXenes. This breakthrough addresses challenges in creating symmetry-breaking materials for advanced electronics and energy applications.
Area of Science:
- Materials Science
- Condensed Matter Physics
- Nanotechnology
Background:
- Janus 2D materials possess unique asymmetry, enabling properties like the Rashba effect and piezoelectricity for advanced applications.
- Current limitations in synthesizing Janus MXenes stem from the inability to create suitable symmetry-breaking MAX phase precursors.
- Existing MAX phases exhibit inversion symmetry, hindering the development of Janus MXenes.
Purpose of the Study:
- To report a novel chemically ordered MAX phase as a precursor for Janus MXenes.
- To experimentally verify the asymmetric ordering in the proposed MAX phase.
- To provide a pathway for synthesizing Janus MXenes and understand symmetry-breaking requirements.
Main Methods:
- Experimental synthesis of the MAX phase (Ti3/11Zr2/11Hf3/11Ta3/11)3(Al2/3Sn1/3)C2.
- Structural characterization to confirm asymmetric ordering.
- X-ray total scattering and reverse Monte Carlo (RMC) modeling for atomic-scale analysis.
Main Results:
- Successful synthesis of a chemically ordered MAX phase with asymmetric ordering.
- Experimental verification of the unique structure suitable for Janus MXene synthesis.
- Atomic-scale insights into chemical ordering and its relation to atomic displacements.
Conclusions:
- The study presents a viable precursor for synthesizing Janus MXenes.
- Highlights the critical role of symmetry-breaking in MAX phase precursors.
- Opens new avenues for exploring Janus MXene properties and applications.
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