Kowalczyk, Dorota A, Rogala, Maciej, Szalowski, Karol, Kozlowski, Witold, Lutsyk, Iaroslav, Piskorski, Michal, Krukowski, Pawel, Dabrowski, Pawel, Belic, Domagoj 
ORCID: 0000-0002-7954-7046, Cichomski, Michal et al (show 2 more authors)
(2021)
Local electronic structure of stable monolayers of <i>α</i>-MoO<sub>3-</sub><i><sub>x</sub></i> grown on graphite substrate.
2D MATERIALS, 8 (2).
025005-025005.
Abstract
<jats:title>Abstract</jats:title> <jats:p>We report on van der Waals epitaxy of two-dimensional (2D) molybdenum trioxide (MoO<jats:sub>3−<jats:italic>x</jats:italic> </jats:sub>) 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<jats:sub>3−<jats:italic>x</jats:italic> </jats:sub> sheets are analysed. Using scanning tunnelling microscopy and spectroscopy, we investigate the electronic properties of MoO<jats:sub>3−<jats:italic>x</jats:italic> </jats:sub> 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<jats:sub>3−<jats:italic>x</jats:italic> </jats:sub> 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<jats:sub>3−<jats:italic>x</jats:italic> </jats:sub> 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<jats:sub>3−<jats:italic>x</jats:italic> </jats:sub>.</jats:p>
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | 2D material, transition metal oxides, molybdenum oxide, electronic structure, scanning tunnelling spectroscopy, work function |
| Depositing User: | Symplectic Admin |
| Date Deposited: | 18 Jan 2021 09:23 |
| Last Modified: | 17 Oct 2023 19:10 |
| DOI: | 10.1088/2053-1583/abcf10 |
| Open Access URL: | https://iopscience.iop.org/article/10.1088/2053-15... |
| Related URLs: | |
| URI: | https://livrepository.liverpool.ac.uk/id/eprint/3113943 |
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