单层
工作职能
材料科学
X射线光电子能谱
高定向热解石墨
带隙
电子结构
密度泛函理论
石墨
基质(水族馆)
扫描隧道显微镜
结晶学
分析化学(期刊)
图层(电子)
纳米技术
化学
计算化学
光电子学
化学工程
地质学
工程类
海洋学
复合材料
色谱法
作者
Dorota A. Kowalczyk,Maciej Rogala,Karol Szałowski,W. Kozłowski,Iaroslav Lutsyk,M. Piskorski,Paweł Krukowski,P. Dąbrowski,Domagoj Belić,M. Cichomski,Z. Klusek,P.J. Kowalczyk
出处
期刊:2D materials
[IOP Publishing]
日期:2020-12-21
卷期号:8 (2): 025005-025005
被引量:13
标识
DOI:10.1088/2053-1583/abcf10
摘要
Abstract We report on van der Waals epitaxy of two-dimensional (2D) molybdenum trioxide (MoO 3− x ) with monolayer thickness directly grown on highly oriented pyrolytic graphite by thermal evaporation under ultrahigh vacuum. The chemical composition, electronic and crystalline lattice structures of the mono-and few-layer MoO 3− x sheets are analysed. Using scanning tunnelling microscopy and spectroscopy, we investigate the electronic properties of MoO 3− x as a function of the number of layers and measure the apparent energy gap to be 0.4 eV for the first three layers of MoO 3− x on graphite. We carried out density functional theory calculations to shed light on the mechanism underlying the observed narrow bandgap with oxygen deficiency. Moreover, the air exposure effect on monolayer MoO 3− x is investigated confirming that the apparent bandgap closes, and additionally we show the reduction of the work function from 5.7 to 4.7 eV. We prove that it is possible to synthesize the 2D, non-stoichiometric, and electrically conductive MoO 3− x .
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