Work

Structural Characterization of a Novel Two-Dimensional Material: Cobalt Sulfide Sheets on Au(111)

Year: 2020

Type: article

Abstract: Transition metal dichalcogenides (TMDCs) are a type of two-dimensional (2D) material that has been widely investigated by both experimentalists and theoreticians because of their unique properties. In the case of cobalt sulfide, density functional theory (DFT) calculations on free-standing S-Co-S sheets suggest there are no stable 2D cobalt sulfide polymorphs, whereas experimental observations clearly show TMDC-like structures on Au(111). In this study, we resolve this disagreement by using a combination of experimental techniques and DFT calculations, considering the substrate explicitly. We find a 2D CoS(0001)-like sheet on Au(111) that delivers excellent agreement between theory and experiment. Uniquely this sheet exhibits a metallic character, contrary to most TMDCs, and exists due to the stabilizing interactions with the Au(111) substrate.

Source: The Journal of Physical Chemistry Letters

DOI: 10.1021/acs.jpclett.0c02268

Authors: Mahesh K. Prabhu, Dajo Boden, Marcel J. Rost, Jörg Meyer, Irene M. N. Groot

Institution: Leiden University

Language: English

Topic: 2D Materials and Applications

Subfield: Materials Chemistry

Field: Materials Science

Domain: Physical Sciences

Open Access status: hybrid

Estimated APC paid: $5,000

Funder: Universiteit Leiden