MIL-101(Cr)@QCM and MIL-101(Cr)@IDE as Sorbent-Based Humidity Sensors for Indoor Air Monitoring

Area of Science:

• Materials Science
• Nanotechnology
• Chemical Sensing

Background:

• Metal-organic frameworks (MOFs) offer tunable properties for sensing applications.
• MIL-101(Cr) is a robust MOF with a high surface area.
• Humidity sensing is crucial for indoor air quality management.

Purpose of the Study:

• To develop and evaluate MIL-101(Cr) thin films as humidity sensors.
• To assess the performance of MIL-101(Cr) on different transducer platforms.
• To investigate the sensing characteristics for indoor air applications.

Main Methods:

• Deposition of MIL-101(Cr) films onto quartz crystal microbalance (QCM) transducers.
• Fabrication of MIL-101(Cr) coated interdigitated electrode (IDE) sensors.
• Testing sensor response, recovery, repeatability, stability, and selectivity to humidity and toluene.

Main Results:

• Both QCM and IDE sensors demonstrated high sensitivity to humidity.
• Fast response and recovery times were observed for the MIL-101(Cr) sensors.
• The sensors exhibited good repeatability, long-term stability, and selectivity against toluene.
• Dual-mode sensing behavior was noted within the optimal humidity range for indoor environments.

Conclusions:

• MIL-101(Cr) thin films are effective materials for developing high-performance humidity sensors.
• The developed sensors show promise for reliable indoor air quality monitoring.
• The combination of sensitivity, stability, and selectivity makes MIL-101(Cr) a suitable MOF for practical sensing devices.