Photoluminescent Metal–Organic Frameworks for Gas Sensing

Abstract

Luminescence of porous coordination polymers (PCPs) or metal–organic frameworks (MOFs) is sensitive to the type and concentration of chemical species in the surrounding environment, because these materials combine the advantages of the highly regular porous structures and various luminescence mechanisms, as well as diversified host‐guest interactions. In the past few years, luminescent MOFs have attracted more and more attention for chemical sensing of gas‐phase analytes, including common gases and vapors of solids/liquids. While liquid‐phase and gas‐phase luminescence sensing by MOFs share similar mechanisms such as host‐guest electron and/or energy transfer, exiplex formation, and guest‐perturbing of excited‐state energy level and radiation pathways, via various types of host‐guest interactions, gas‐phase sensing has its unique advantages and challenges, such as easy utilization of encapsulated guest luminophores and difficulty for accurate measurement of the intensity change. This review summarizes recent progresses by using luminescent MOFs as reusable sensing materials for detection of gases and vapors of solids/liquids especially for O2, highlighting various strategies for improving the sensitivity, selectivity, stability, and accuracy, reducing the materials cost, and developing related devices.

Crystal structure of poly{[μ2-1,1′-(sulfonylbis(4,1-phenylene))bis(2-methyl-1H-imidazole)-κ2 N:N′][μ2-4,4′-oxydibenzoato-κ2 O:O′]cobalt(II)} hemihydrate, C34H27N4O7.5SCo

“…Over the past three decades, MOFs have been paid much attention for their great potential applications in many areas [3][4][5][6][7][8].…”

Functionalization of Metal–Organic Frameworks for Photoactive Materials

“…The collaborative functionalities of the intrinsic porosity and luminescent properties of MOFs make them very promising as a new type of sensory material . The porous, crystalline MOF architecture provides several advantages .…”

“…In the past few years, some luminescent MOFs have also been explored for sensing gas‐phase analytes, including common gases and vapors of solids/liquids …”

Preparation and Optical Study of Zn(II) Metal Organic Framework Thin Film for Xylene Gas Sensing Application

“…[21] When the well-oriented MOF thin films adsorbed analytes, in most cases, the changes in structural, electrical, or optical properties, such as fluorescence, refractive index, or color can be detected. [23,24] Xu et al [25] reported that the HKUST-1 that loaded on mass-gravimetric resonant cantilevers exhibited high sensitivity to p-xylene with the detection limit of 400 ppb. While for Cu-based MOF, Cu(bdc)·xH 2 O was grown as a thin film on interdigitated electrodes, generates capacitance change upon acetone, ethanol, toluene, and methanol vapor, and exhibits more sensitivities at low concentrations for toluene.…”