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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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Citations
Suppressing photoexcited electron–hole recombination in MoSe2/WSe2 lateral heterostructures via interface-coupled state engineering: a time-domain ab initio study
TL;DR: In this paper, the photogenerated carrier dynamics at the interface play a vital role in two-dimensional heterostructure-based photovoltaic and photoelectric devices.
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Single noble metals (Pd, Pt and Ir) anchored Janus MoSSe monolayers: Efficient oxygen reduction/evolution reaction bifunctional electrocatalysts and harmful gas detectors.
TL;DR: In this paper , the binding properties of single noble metal atoms (Pd, Pt and Ir) anchored Janus MoSSe monolayers (MLs), the catalytic activity of Pd- and Pt-MoSSe in oxygen reduction reaction (ORR) and oxygen evolution reaction (OER), as well as the adsorption behaviors of Ir-MoSe for harmful NO, CO and NH3 molecules are systematically studied from the first-principles calculations.
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Emergence of a spin-valley Dirac semimetal in a strained group-VA monolayer.
TL;DR: It is predicted that a two-dimensional cyanided group-VA monolayer, MAs(CN)2, can turn into the spin-valley Dirac point (svDP) state under external strains and an effective tight-binding model is used to unveil the physics of svDP and topological phase transition under strain.
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Recent Advances in Synthesis and Applications of 2D Junctions.
TL;DR: Methods such as mechanical transfer, chemical vapor deposition growth, high temperature conversion, phase engineering, surface doping, electrostatic doping, and so on to fabricate 2D heterostructures to integrate 2D materials are discussed in detail.
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A first-principles study of Janus monolayer TiSSe and VSSe as anode materials in alkali metal ion batteries.
Fen Xiong,Yue Chen +1 more
TL;DR: It is found that alkali metal atoms X can be stably adsorbed on the surfaces of Janus MSSe, and have low diffusion energy barriers, and it is predicted that the MSSe-2X systems have low open circuit voltages (OCVs) and high capacities.
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