# Carbon Cage Nanosensors for Selective Detection of Toxic Gas Molecules

## TL;DR

This paper introduces a new carbon cage nanosensor that can detect and distinguish five toxic gas molecules with high precision.

## Contribution

A novel carbon cage nanosensor design is proposed for selective detection of multiple toxic gas molecules.

## Key findings

- The nanosensor shows significant changes in electronic properties when exposed to different toxic gases.
- Distinct current and Seebeck coefficient responses enable effective discrimination of AsH3, SO3, H2S, H2Se, and H2Te.
- The design offers a pathway for creating more sensitive and precise nanoscale detection devices.

## Abstract

The detection of
toxic substances is of utmost importance in diverse
fields, from industry to medicine, and their precise discrimination
could lead to significant advances in all of them. Here, we propose
a novel nanosensor with a carbon cage structure that can effectively
discriminate between 5 types of toxic gas molecules, namely AsH3, SO3, H2S, H2Se, and H2Te. We use first-principles simulations to design such a device
and study its electronic and transport properties in the absence or
presence of the molecules. The density of states and transmission
of the combined systems change dramatically for all cases, which translates
into different currents and Seebeck coefficients that clearly allow
to effectively discriminate all of them. These results pave the way
for the design of more precise and sensitive nanoscale devices that
can lead to improved detection and discrimination of various substances.