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.