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ZIF-8-based chemiresistive CO2 sensor: fabrication, performance evaluation, and comparison with NDIR and colorimetric
Natraj Athreya A S1, S Fouziya Sulthana1
1Department of Mechatronics Engineering, College of Engineering and Technology, SRM Institute of Science and Technology Kattankulathur Tamil Nadu 603203 India fouziyas@srmist.edu.in.
RSC Advances
|July 6, 2026
Summary
Researchers developed a new ZIF-8 based sensor for detecting carbon dioxide (CO2) at room temperature. This energy-efficient sensor offers a practical alternative for environmental monitoring and safety applications.
Area of Science:
- Materials Science
- Chemical Engineering
- Sensor Technology
Background:
- Carbon dioxide (CO2) is an environmental gas, but high concentrations pose toxicity risks.
- Conventional metal oxide sensors require high temperatures for CO2 detection.
- ZIF-8 offers high porosity and selective CO2 adsorption at room temperature.
Purpose of the Study:
- To fabricate and evaluate a chemiresistive CO2 sensor using ZIF-8.
- To compare ZIF-8 sensor performance against NDIR-based SCD40 and ZIF-8 colorimetric sensors.
- To develop a practical, scalable, and energy-efficient CO2 sensing solution.
Main Methods:
- ZIF-8 fabrication via solvothermal method.
- Sensor fabrication by drop-casting ZIF-8 on an etched ITO glass substrate.
- Calibration against an NDIR-based SCD40 sensor (400-1600 ppm CO2).
- Resistance response analysis and curve fitting.
- Implementation of a model on an ESP32 microcontroller for CO2 concentration readout.
Main Results:
- The ZIF-8 chemiresistive sensor demonstrated effective CO2 sensing capabilities.
- Performance was evaluated against SCD40 and colorimetric sensors across various CO2 levels.
- A model was developed to convert resistance data to CO2 concentrations (ppm).
Conclusions:
- The ZIF-8 based chemiresistive sensor presents a viable, energy-efficient alternative for CO2 detection.
- This technology is suitable for environmental monitoring, industrial safety, and healthcare.
- The sensor offers a scalable and practical solution compared to high-temperature methods.
