Designing oxide chemiresistors for detecting volatile aromatic compounds: recent progresses and future perspectives

Area of Science:

• Materials Science
• Chemical Sensing
• Nanotechnology

Background:

• Oxide chemiresistors commonly detect reactive gases but struggle with stable volatile aromatic compounds (VOCs) like benzene, toluene, and xylene.
• The molecular stability of benzene rings poses challenges for selective and sensitive detection of these toxic VOCs.
• Current sensing material performance is often insufficient for detecting the trace concentrations of VOCs that pose health risks.

Purpose of the Study:

• To review and suggest strategies for designing highly selective and sensitive oxide chemiresistor-based gas sensors for volatile aromatic compounds.
• To address the limitations in detecting toxic aromatic compounds at trace levels.
• To provide future perspectives on material and sensor design for improved VOC detection.

Main Methods:

• Review of strategies including thermal activation and catalyst design for sensing materials.
• Utilization of catalytic microreactors and bilayer structures with catalytic overlayers.
• Analysis of analyte gas pretreatment and post-analysis of sensing signals.

Main Results:

• Identified key approaches to enhance selectivity and sensitivity in oxide chemiresistors for VOC detection.
• Highlighted the importance of catalytic activity and specific structural designs.
• Discussed methods for improving detection limits and sensor robustness.

Conclusions:

• Effective strategies exist for developing advanced oxide chemiresistors for detecting harmful volatile aromatic compounds.
• Future research should focus on novel material design and sensor architectures for high-performance VOC sensing.
• These sensors have potential applications in environmental monitoring and safety.