A Highly Sensitive Room Temperature CO₂ Gas Sensor Based on SnO₂-rGO Hybrid Composite

Area of Science:

• Materials Science
• Chemical Engineering
• Sensor Technology

Background:

• Carbon dioxide (CO2) gas detection is crucial for environmental monitoring and industrial safety.
• Existing gas sensors often require heating elements, increasing energy consumption and device complexity.
• Developing room-temperature gas sensors is essential for portable and low-power applications.

Purpose of the Study:

• To develop a high-performance tin oxide (SnO2) and reduced graphene oxide (rGO) hybrid composite gas sensor for CO2 detection.
• To investigate the feasibility of a heater-independent gas sensor for reduced complexity and cost.
• To evaluate the sensing performance of the SnO2-rGO composite at room temperature.

Main Methods:

• In-situ chemical reduction was used to synthesize the SnO2-rGO hybrid composite.
• Material characterization included FESEM, HRTEM, EDX, Raman spectroscopy, and XPS.
• Gas sensing performance was tested across a range of CO2 concentrations at room temperature.

Main Results:

• The SnO2-rGO hybrid composite demonstrated excellent response magnitudes to CO2.
• The sensor exhibited good linearity and a low detection limit for CO2.
• Characterization confirmed the formation and structure of the hybrid composite.

Conclusions:

• The SnO2-rGO hybrid composite shows significant promise for efficient room-temperature CO2 gas detection.
• The synergistic effect between SnO2 and rGO enhances charge transport and sensing sites, leading to superior performance.
• This heater-independent sensor is suitable for integration into portable devices, reducing energy consumption and fabrication costs.