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Janus Monolayer Transition Metal Dichalcogenides
Jing Zhang,Shuai Jia,Kholmanov Iskandar,Liang Dong,Dequan Er,Weibing Chen,Hua Guo,Zehua Jin,Vivek B. Shenoy,Li Shi,Jun Lou +10 more
TL;DR: In this article, a novel crystal configuration of sandwiched S-Mo-Se structure (Janus SMoSe) at the monolayer limit has been synthesized and carefully characterized.
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Abstract: A novel crystal configuration of sandwiched S-Mo-Se structure (Janus SMoSe) at the monolayer limit has been synthesized and carefully characterized in this work. By controlled sulfurization of monolayer MoSe2 the top layer of selenium atoms are substituted by sulfur atoms while the bottom selenium layer remains intact. The peculiar structure of this new material is systematically investigated by Raman, photoluminescence and X-ray photoelectron spectroscopy and confirmed by transmission-electron microscopy and time-of-flight secondary ion mass spectrometry. Density-functional theory calculations are performed to better understand the Raman vibration modes and electronic structures of the Janus SMoSe monolayer, which are found to correlate well with corresponding experimental results. Finally, high basal plane hydrogen evolution reaction (HER) activity is discovered for the Janus monolayer and DFT calculation implies that the activity originates from the synergistic effect of the intrinsic defects and structural strain inherent in the Janus structure.
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Strain effect on the mechanical and electronic properties of graphene-like B4P4C4 and B2P2C8: First-principles calculation
TL;DR: In this paper, the structural, mechanical and electronic properties of B4P4C4 and B2P2C8 monolayers are investigated based on first-principles methods.
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Vibrational identification of Janus <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mi>Pt</mml:mi><mml:mi>X</mml:mi><mml:mi mathvariant="normal">O</mml:mi></mml:mrow><mml:mspace width="4pt" /><mml:mo>(</mml:mo><mml:mrow><mml:mi>X</mml:mi><mml:mo>=</mml:mo><mml:mrow><mml:mi m
Wei Zhang,Weixiao Ji +1 more
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Large Vertical Piezoelectricity in a Janus Cr2I3F3 Monolayer
TL;DR: In this paper , a 2D Janus Cr2I3F3 monolayer was proposed as a multifunctional material exhibiting both piezoelectricity and ferromagnetism.
Phase transition of a MoS2 monolayer through top layer desulfurization by He+ ion irradiation
TL;DR: In this paper , the structural and electronic changes of the MoS2 monolayer were investigated by removing the top sulfur layer using low-energy He+ ion sputtering, and the oxidized MoS x surface restored a semiconducting state with narrowed bandgap, p-type conduction, or possibly a semimetallic state.
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