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Development of an NO₂ Gas Sensor Based on Laser-Induced Graphene Operating at Room Temperature.

Gizem Soydan¹, Ali Fuat Ergenc², Ahmet T Alpas³

¹Department of Metallurgical and Materials Engineering, Istanbul Technical University, Istanbul 34469, Turkey.

Sensors (Basel, Switzerland)

|May 25, 2024

Summary

Researchers developed a low-cost, flexible nitrogen dioxide (NO2) sensor using laser-induced graphene (LIG) and tin dioxide (SnO2) heterostructures. This novel sensor operates effectively at room temperature, offering a new solution for toxic gas monitoring.

Keywords:

NO2 gas sensor SnO2 environmental monitoring laser scribing laser-induced graphene room temperature gas sensing

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Area of Science:

Materials Science
Chemical Engineering
Environmental Science

Background:

Toxic nitrogen dioxide (NO2) gas poses significant environmental and health risks, necessitating effective monitoring solutions.
Existing NO2 sensors often require high operating temperatures, increasing energy consumption and limiting applications.
Development of low-cost, ambient-temperature sensors is crucial for widespread toxic gas detection.

Purpose of the Study:

To develop a novel, facile, and low-cost method for fabricating flexible NO2 sensors.
To synthesize and characterize laser-induced graphene (LIG) and LIG/SnO2 heterostructures for gas sensing.
To investigate the gas-sensing performance of these materials at ambient temperature.

Main Methods:

Fabrication of flexible sensors using laser scribing to create porous LIG and LIG/SnO2 heterostructures.
Material characterization via scanning electron microscopy (SEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and Raman spectroscopy.
Gas-sensing measurements at room temperature using varying concentrations of NO2 (50-10 ppm).

Main Results:

Successful synthesis of highly porous LIG and LIG/SnO2 heterostructures.
Demonstrated distinct gas-sensing responses of LIG and LIG/SnO2 sensors to NO2.
Elucidation of the gas-sensing mechanism for NO2 detection at ambient temperature.

Conclusions:

The study successfully demonstrates a low-cost, in situ method for fabricating flexible NO2 sensors.
LIG and LIG/SnO2 heterostructures show significant potential for ambient-temperature gas sensing applications.
The developed sensors offer a promising solution for effective and energy-efficient NO2 monitoring.