# Chemiresistive Effect in Ti0.2V1.8C MXene/Metal Oxide Hetero-Structured Composites

## TL;DR

Researchers created MXene-metal oxide composites that can detect different gas vapors, showing potential for use in electronic nose devices.

## Contribution

The study introduces Ti0.2V1.8C MXene/metal oxide heterostructures as novel chemiresistive materials for gas sensing.

## Key findings

- MXene-metal oxide composites showed distinct responses to alcohol and ammonia vapors.
- Sensor arrays using these composites enabled selective vapor identification via linear discriminant analysis.
- The materials demonstrated potential for scalable sensor prototype development.

## Abstract

What are the main findings?
Heterostructures of Ti0.2V1.8C MXenes with metal oxides have been synthesized.Ti0.2V1.8C MXene/metal oxide composites have been tested as chemiresistive elements.

Heterostructures of Ti0.2V1.8C MXenes with metal oxides have been synthesized.

Ti0.2V1.8C MXene/metal oxide composites have been tested as chemiresistive elements.

What are the implications of the main findings?
The synthesis protocol for Ti0.2V1.8C MXene/metal oxide composites could be further scaled when developing sensor prototype units.The Ti0.2V1.8C MXene/metal oxide composites are shown as promising, versatile materials for designing multisensor arrays.

The synthesis protocol for Ti0.2V1.8C MXene/metal oxide composites could be further scaled when developing sensor prototype units.

The Ti0.2V1.8C MXene/metal oxide composites are shown as promising, versatile materials for designing multisensor arrays.

Two-dimensional carbide crystals (MXenes) are emerging as a promising platform for the development of novel gas sensors, offering advantages in energy efficiency and tunable analyte selectivity. One of the most effective strategies to enhance and tailor their functional performance involves forming hetero-structured composites with metal oxides. In this work, we explore a chemiresistive effect in double-metal MXene of Ti0.2V1.8C and its composites with 2 mol. % SnO2 and Co3O4 nanocrystalline oxides toward feasibility tests with alcohol and ammonia vapor probes. The materials were characterized by simultaneous thermal analysis, X-ray diffraction analysis, Raman spectroscopy, and scanning/transmission electron microscopy. Gas-sensing experiments were carried out on composite layers deposited on multi-electrode substrates to be exposed to the test gases, 200–2000 ppm concentrations, at an operating temperature of 370 °C. The developed sensor array demonstrated clear analyte discrimination. The distinct sensor responses enabled a selective identification of vapors through linear discriminant analysis, demonstrating the further potential of MXene-based materials for integrated electronic nose applications.