Metal-Organic Frameworks for Toxic Gas Sensing: From Molecular Engineering to Device Integration

Area of Science:

• Materials Science
• Chemical Engineering
• Sensor Technology

Background:

• Metal-organic frameworks (MOFs) offer tunable porosity, high surface area, and chemical versatility, making them promising for gas sensing.
• There is a critical need for portable and selective sensors to detect industrial pollutants and chemical warfare agents.

Purpose of the Study:

• To review the development of MOF films integrated with field-effect transistors (FETs), focusing on organic FETs (OFETs).
• To connect molecular adsorption/diffusion processes to device-level charge transport and sensor response.
• To outline design principles for MOF sensor development and discuss challenges and advances.

Main Methods:

• Literature review of MOF film evolution and integration with FETs.
• Analysis of molecular-level processes (adsorption, diffusion) and their impact on device performance.
• Case studies (e.g., CPO-27-Ni OFETs for mustard simulants) to illustrate design principles.

Main Results:

• MOF-FET sensors demonstrate potential for selective toxic gas detection.
• Understanding molecular interactions is key to optimizing sensor response.
• Advances include mixed-metal MOFs, hydrophobic modifications, and AI-guided discovery.

Conclusions:

• MOF-semiconductor hybrids are crucial for next-generation toxic gas sensors.
• Addressing challenges in conductivity, processability, and stability is essential for practical applications.
• These sensors are vital for environmental, industrial, and defense applications.