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Related Experiment Video

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Electronic Tongue Generating Continuous Recognition Patterns for Protein Analysis

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Polymer-Based Chemicapacitive Hybrid Sensor Array for Improved Selectivity in e-Nose Systems.

Pavithra Munirathinam¹, Mohd Farhan Arshi¹, Haleh Nazemi¹

¹E-Minds Laboratory, Electrical and Computer Engineering Department, University of Windsor, Windsor, ON N9B 3P4, Canada.

Sensors (Basel, Switzerland)

|July 12, 2025

Summary

New hybrid sensor arrays (HSAs) using interdigitated electrodes significantly improve volatile organic compound (VOC) detection. These polymer-based sensors achieve 100% accuracy, advancing electronic nose technology for health and safety.

Keywords:

fringing field capacitance hybrid sensor array multi-sensor array polymer-based sensors virtual sensor array volatile organic compounds

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Area of Science:

Materials Science
Chemical Sensing
Nanotechnology

Background:

Volatile organic compounds (VOCs) detection is crucial for environmental monitoring, health diagnostics, and industrial safety.
Current gas sensing technologies face challenges in achieving high selectivity and sensitivity, especially in complex environments.
Polymer-based sensor arrays with interdigitated electrode (IDE) geometries offer potential for enhanced VOC detection.

Purpose of the Study:

To develop and evaluate polymer-based hybrid sensor arrays (HSAs) with IDE geometries for improved VOC detection.
To enhance the selectivity and sensitivity of gas sensors for accurate compound identification and concentration estimation.
To advance electronic nose (e-Nose) technology for reliable VOC monitoring.

Main Methods:

Fabrication of IDE-based sensors using the Polysilicon Multi-User MEMS process (PolyMUMPs).
Experimental evaluation of polymer-based HSAs exposed to various VOCs under controlled conditions.
Integration and comparison of virtual sensor arrays (VSAs) and HSAs for performance analysis.

Main Results:

Virtual sensor arrays (PMMA-VSA and PVP-VSA) demonstrated high prediction accuracies of 100% and 98%, respectively.
The proposed polymer-based hybrid sensor array (HSA) consistently achieved 100% accuracy in compound identification and concentration estimation.
HSAs significantly surpassed the performance of traditional multi-sensor arrays (MSAs) and VSAs.

Conclusions:

Polymer-based HSAs with advanced IDE geometries offer a significant advancement in VOC detection technology.
The proposed HSAs demonstrate superior selectivity and sensitivity, enabling more accurate and reliable gas sensing.
These findings pave the way for more effective e-Nose applications in health, environmental, and industrial safety sectors.