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Multiplexed Gas Sensor: Fabrication Strategies, Recent Progress, and Challenges.

Gulshan Verma1, Anisha Gokarna2, Hind Kadiri2

  • 1Department of Mechanical Engineering, Indian Institute of Technology, Jodhpur 342030, India.

ACS Sensors
|August 21, 2023
PubMed
Summary

Advancements in multiplex gas sensors are crucial for detecting toxic gases, overcoming limitations like low selectivity. This technology uses sensor arrays and pattern recognition to identify specific gases by their unique "fingerprints".

Keywords:
chemiresistive sensorscross selectivitygas sensorinterdigitated electrodesmicrosystemmultisensor arraypattern recognitiontoxic gas

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Area of Science:

  • Materials Science
  • Chemical Engineering
  • Sensor Technology

Background:

  • Growing need for advanced gas sensing due to toxic gases in various industries (beverage, healthcare, environmental monitoring, etc.).
  • Existing gas sensors suffer from low selectivity and cross-sensitivity, leading to inaccurate signals.
  • Limitations necessitate improved gas sensor technology for safety and industrial applications.

Purpose of the Study:

  • To provide a comprehensive review of chemiresistive-based multiplex gas sensors.
  • To explore fabrication strategies, sensing materials, and pattern recognition techniques.
  • To assess the current state-of-the-art and identify future research challenges.

Main Methods:

  • Review of multiplex gas sensor principles, combining multiple sensors, signal processing, and pattern recognition.
  • Analysis of various fabrication techniques, from expensive to low-cost methods.
  • Examination of advances in sensing materials and their application in sensor arrays.

Main Results:

  • Multiplex gas sensors offer enhanced selectivity by utilizing unique response signals ('fingerprints') from different sensing materials.
  • Pattern recognition techniques are crucial for interpreting complex sensor array data.
  • Both rigid and flexible gas sensor applications are discussed, highlighting fabrication and material advancements.

Conclusions:

  • Multiplex gas sensors represent a significant advancement in addressing selectivity and cross-sensitivity issues.
  • The technology holds promise for diverse applications requiring accurate gas detection.
  • Further research is needed to overcome current challenges and optimize multiplex gas sensor technology.