ZIF-8-Based Surface Plasmon Resonance and Fabry-Pérot Sensors for Volatile Organic Compounds

Area of Science:

• Materials Science
• Chemical Sensing
• Nanotechnology

Background:

• Volatile organic compounds (VOCs) pose environmental and health risks, necessitating sensitive detection methods.
• Metal-organic frameworks (MOFs) offer tunable properties for advanced sensing applications.
• Optical sensors provide non-destructive and real-time monitoring capabilities.

Purpose of the Study:

• To investigate the efficacy of ZIF-8 as a sensing material for optical detection of VOCs.
• To evaluate ZIF-8 based Fabry-Pérot and Surface Plasmon Resonance (SPR) sensors for ethanol (EtOH) detection.
• To assess sensor performance metrics including response time, limit of detection, selectivity, and environmental robustness.

Main Methods:

• Fabrication of optical sensors incorporating ZIF-8 material.
• Experimental testing of sensor response to ethanol (EtOH) under saturated conditions.
• Analysis of sensor performance, including response/recovery times and limit of detection (LOD).
• Evaluation of sensor selectivity towards other VOCs and its response to humidity.

Main Results:

• ZIF-8 based Fabry-Pérot and SPR sensors demonstrated rapid response times, as low as 30 seconds, for ethanol detection.
• The estimated limit of detection (LOD) for ethanol was below 4000 ppm for both sensor configurations.
• ZIF-8's confirmed hydrophobicity rendered the sensors insensitive to moisture, enhancing practical applicability.
• While selectivity to other VOCs was moderate, distinct adsorption/desorption dynamics suggest potential for differentiation.

Conclusions:

• ZIF-8 is a promising material for developing efficient optical sensors for VOC detection.
• The developed sensors exhibit fast response and low detection limits, particularly for ethanol.
• The inherent hydrophobicity of ZIF-8 is a significant advantage for real-world gas sensing applications.