Scanning Tunneling Spectroscopy of MoS2 monolayer in presence of ethanol gas

TL;DR

This study investigates how ethanol gas adsorption affects the electronic properties of MoS2 monolayers, revealing increased density of states and orbital deformation that could enhance gas sensing capabilities.

Contribution

It combines experimental STS measurements with DFT calculations to analyze ethanol's impact on the electronic structure of MoS2 nanosheets in non-vacuum conditions.

Findings

Ethanol adsorption increases the DOS of MoS2.

Orbital deformation occurs near valence and conduction bands.

Transport of carriers is enhanced due to ethanol presence.

Abstract

Due to high surface to volume ratio and tunable band gap, 2 Dimensional (2D) layered materials such as MoS2, is good candidate for gas sensing applications. This research mainly focuses on variation of Density of States (DOS) of MoS2 nanosheets caused by ethanol adsorption. The nanosheets are synthesized by liquid exfoliation, and then using Scanning Tunneling Spectroscopy (STS) and Density Functional Theory (DFT), local electronic characteristic such as DOS and band gap in non-vacuum condition are analyzed. The results show that ethanol adsorption enhances DOS and deform orbitals near the valence and conduction bands that increase transport of carriers on the sheet.