A comprehensive first-principle study of borophene-based nano gas sensor with gold electrodes

TL;DR

This study uses density functional theory and Green's function methods to analyze borophene-based nano gas sensors with gold electrodes, revealing their ability to detect specific gases and the effects of substrates and electrodes on transport properties.

Contribution

It provides a detailed computational analysis of borophene-based gas sensors with gold electrodes, highlighting the effects of gas molecules, substrates, and electrodes on transport behavior.

Findings

Sensors can detect CO, NO, NO₂, and NH₃ gases.

MoS₂ substrate causes non-linear I-V behavior.

Gold electrodes reduce current by forming a potential barrier.

Abstract

Using density functional theory combined with nonequilibrium Green's function method, the transport properties of borophene-based nano gas sensors with gold electrodes are calculated, and comprehensive understandings regarding the effects of gas molecules, MoS$_2$ substrate and gold electrodes to the transport properties of borophene are made. Results show that borophene-based sensors can be used to detect and distinguish CO, NO, NO$_2$ and NH$_3$ gas molecules, MoS$_2$ substrate leads to a non-linear behavior on the current-voltage characteristic, and gold electrodes provide charges to borophene and form a potential barrier, which reduced the current values compared to the current of the systems without gold electrodes. Our studies not only provide useful information on the computationally design of borophene-based gas sensors, but also help understand the transport behaviors and underlying physics of 2D metallic materials with metal electrodes.