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Identifying two-dimensional layered materials in the monolayer limit has led to discoveries of numerous new phenomena and unusual properties. We introduced elemental silicon during chemical vapor deposition growth of nonlayered molybdenum nitride to passivate its surface, which enabled the growth of centimeter-scale monolayer films of MoSi2N4 This monolayer was built up by septuple atomic layers of N-Si-N-Mo-N-Si-N, which can be viewed as a MoN2 layer sandwiched between two Si-N bilayers. This material exhibited semiconducting behavior (bandgap ~1.94 electron volts), high strength (~66 gigapascals), and excellent ambient stability. Density functional theory calculations predict a large family of such monolayer structured two-dimensional layered materials, including semiconductors, metals, and magnetic half-metals.
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Yilun Hong
Zhibo Liu
Lei Wang
Science
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Chinese Academy of Sciences
Tsinghua University
University of Science and Technology of China
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Hong et al. (Fri,) studied this question.
www.synapsesocial.com/papers/69c8123e82923aa0e54cbb05 — DOI: https://doi.org/10.1126/science.abb7023
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