Janus Monolayer Transition-Metal Dichalcogenides

Year: 2017

Authors: Zhang Jing; Jia Shuai; Kholmanov Iskandar; Dong Liang; Er Dequan; Chen Weibing; Guo Hua; Jin Zehua; Shenoy Vivek B.; Shi Li; Lou Jun

Autors Affiliation: Rice Univ, Dept Mat Sci & Nanoengn, Houston, TX 77005 USA; Univ Texas Austin, Dept Mech Engn, Austin, TX 78712 USA; Univ Penn, Dept Mat Sci & Engn, 3231 Walnut St, Philadelphia, PA 19104 USA

Abstract: The 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 is substituted by sulfur atoms, while the bottom selenium layer remains intact. The structure of this material is systematically investigated by Raman, photoluminescence, transmission electron microscopy, and X-ray photoelectron spectroscopy and confirmed by time-of-flight secondary ion mass spectrometry. Density functional theory (DFT) 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 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. (c) 2017 American Chemical Society.

Journal/Review: ACS NANO

Volume: 11 (8)      Pages from: 8192  to: 8198

KeyWords: Janus SMoSe; sulfurization; Raman; TOF-SIMS; HER
DOI: 10.1021/acsnano.7b03186

ImpactFactor: 13.709
Citations: 1109
data from “WEB OF SCIENCE” (of Thomson Reuters) are update at: 2024-11-24
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