Hierarchical conductive metal-organic framework films enabling efficient interfacial mass transfer

Area of Science:

• Materials Science
• Chemical Engineering
• Nanotechnology

Background:

• Heterogeneous reactions on porous solid films are vital in nature and industry.
• Slow molecular diffusion limits interfacial mass transfer and reaction kinetics in conventional films.

Purpose of the Study:

• To develop a strategy for accelerating interfacial gas transfer on porous films.
• To enhance heterogeneous reaction kinetics using hierarchical conductive metal-organic framework (c-MOF) films.

Main Methods:

• Synthesized hierarchical c-MOF films with nanoporous shells and hollow inner voids via in-situ transformation.
• Investigated the effect of hollow structures on gas permeability and molecular motion.
• Fabricated c-MOF film-based chemiresistive sensors for ammonia detection.

Main Results:

• Hollow structures increased gas permeability by over 8.0-fold compared to bulk-type films.
• Enhanced gas molecule motion velocity towards the c-MOF film surface.
• Achieved a 10x faster response speed for ammonia detection at room temperature.

Conclusions:

• Hierarchical c-MOF films with hollow structures offer an effective strategy to accelerate interfacial gas transfer.
• This approach significantly enhances heterogeneous reaction kinetics and sensor performance.
• The developed films show promise for advanced gas sensing applications.