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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
Two-dimensional Janus monolayers with tunable electronic and magnetic properties
TL;DR: In this paper , the authors reported three new 2D Janus nanomagnets VBrCl_2, VBrI_2 and VClBrI for the first time.
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Large in-plane piezoelectricity of Janus Bi2X2Y (X = S, Se, te; Y = S, Se, te; X ≠ Y) monolayers with polyatomic thickness
TL;DR: In this article, the piezoelectric properties of 2D Bi2X2Y and Bi2Te2S monolayers with polyatomic thickness have been investigated, and it is shown that these materials have potential in the application of micro-nano piezolectric devices and flexible electronic devices.
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Superatom Regiochemistry Dictates the Assembly and Surface Reactivity of a Two-Dimensional Material.
Amymarie K. Bartholomew,Elena Meirzadeh,Ilana Stone,Christie S. Koay,Colin Nuckolls,Michael L. Steigerwald,Andrew C. Crowther,Xavier Roy +7 more
TL;DR: This work demonstrates that the bottom-up assembly of layered vdW materials from superatoms is a promising and versatile approach to create 2D materials with tunable physical and chemical properties.
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Two-dimensional Janus B2P6 as potential gas sensors for NO and NO2 detection: A first-principles study
Xiaoqiang Wu,Xinguo Ma,Gang Yuan,Nan Ma,Ruoyue Fan,Chuyun Huang +5 more
TL;DR: A first-principles study reveals Janus B2P6 nanosheets exhibit moderate adsorption energies for NO and NO2, with enhanced sensitivity to NO2, and rapid recovery times, making them potential ultra-sensitive gas sensors under strain conditions.
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Isomers Matter: Physicochemical Properties Dictated by the Position of S and Se in Single Layer MoSSe
TL;DR: In this article, the effect of geometric isomerism on layered mixed dichalcogenides has been demonstrated in the context of graph lattice analysis, showing that the effect can be exponential with respect to the number of vertices.
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