Metal-Organic Framework Coated Devices for Gas Sensing

The demand for monitoring chemical and physical informationsurrounding,air quality, and disease diagnosis has propelled the development ofdevices for gas sensing that are capable of translating external stimuliinto detectable signals. Metal-organic frameworks (MOFs), possessingparticular physiochemical properties with designability in topology,specific surface area, pore size and/or geometry, potential functionalization,and host-guest interactions, reveal excellent development promisesfor manufacturing a variety of MOF-coated sensing devices for multitudinousapplications including gas sensing. The past years have witnessedtremendous progress on the preparation of MOF-coated gas sensors withsuperior sensing performance, especially high sensitivity and selectivity.Although limited reviews have summarized different transduction mechanismsand applications of MOF-coated sensors, reviews summarizing the latestprogress of MOF-coated devices under different working principleswould be a good complement. Herein, we summarize the latest advancesof several classes of MOF-based devices for gas sensing, i.e., chemiresistivesensors, capacitors, field-effect transistors (FETs) or Kelvin probes(KPs), electrochemical, and quartz crystal microbalance (QCM)-basedsensors. The surface chemistry and structural characteristics werecarefully associated with the sensing behaviors of relevant MOF-coatedsensors. Finally, challenges and future prospects for long-term developmentand potentially practical application of MOF-coated sensing devicesare pointed out.

Automated summary

The development of gas sensors that can translate external stimuli into detectable signals has been driven by the demand for monitoring chemical and physical information, air quality, and disease diagnosis. Metal-organic frameworks (MOFs) show promise for manufacturing MOF-coated sensing devices for various applications, including gas sensing, due to their unique physiochemical properties and designability. This article summarizes the latest advances in different types of MOF-based devices for gas sensing, such as chemiresistive sensors, capacitors, field-effect transistors (FETs) or Kelvin probes (KPs), electrochemical sensors, and quartz crystal microbalance (QCM)-based sensors. The surface chemistry and structural characteristics of MOF-coated sensors are carefully analyzed in relation to their sensing behaviors. Challenges and future prospects for the long-term development and practical application of MOF-coated sensing devices are also discussed.