Towards a chemiresistive sensor-integrated electronic nose: a review

Area of Science:

• Materials Science
• Electrical Engineering
• Sensor Technology

Background:

• Electronic noses offer broad applications but are limited by large size and high cost.
• Chemiresistive gas sensors, including metal-oxide semiconductor and conductive polymer types, are key components for miniaturization.

Purpose of the Study:

• To review system integration strategies for chemiresistive gas sensors in electronic noses.
• To focus on reducing the size and cost of electronic nose systems through integrated technologies.

Main Methods:

• Discussion of system design considerations for integrated electronic noses.
• Analysis of complementary metal-oxide-semiconductor (CMOS) integrated technology for sensor arrays, readout interfaces, and pattern recognition hardware.

Main Results:

• Exploration of state-of-the-art integrated technologies, including sensing front-end chips, signal processing chips, and system-on-chip (SoC) designs.
• Emphasis on the potential for miniaturization and cost reduction via integrated sensor arrays and processing.

Conclusions:

• System integration using chemiresistive gas sensors and CMOS technology is crucial for developing compact and affordable electronic noses.
• Advancements in integrated chips pave the way for widespread adoption of electronic nose technology in daily life.