Abstract
Metal-organic framework (MOF) based stimuli-responsive polymers (coordination polymers) exhibit reversible phase-transition behavior and demonstrate attractive properties that are capable of altering physical and/or chemical properties upon exposure to external stimuli, including pH, temperature, ions, etc., in a dynamic fashion. Thus, their conformational change can be imitated by the adsorption/desorption of target analytes (guest molecules), temperature or pressure changes, and electromagnetic field manipulation. MOF-based stimuli responsive polymers have received great attention due to their advanced optical properties and variety of applications. Herein, we summarized some recent progress on MOF-based stimuli-responsive polymers (SRPs) classified by physical and chemical responsiveness, including temperature, pressure, electricity, pH, metal ions, gases, alcohol and multi-targets.
Highlights
Mother Nature has served as a great source of inspiration for the design and development of intelligent materials
We illustrated four types of sensing mechanisms in metal-organic framework (MOF) in response to different stimuli based on the number of species involved, such as only metal–ligand, metal–ligand–auxiliary ligand, and metal
Physically and chemically responsive MOFs were given in two sections, including temperature, mechanic force, electricity and pH, metal ions, gas, and alcohol responses, respectively
Summary
Mother Nature has served as a great source of inspiration for the design and development of intelligent materials. Different from conventional stimuli responsive polymers in which the repeating unit (monomer) is connected through a covalent bond, MOF-based SRPs are constructed via weak interactions, such as metal coordination, hydrophobic association, electrostatic interactions, van der Waals forces, etc. They have been widely used in sensing applications due to their advanced optical properties, such as the intrinsic luminescent feature of sharp emission within a wide spectra range, long luminescence lifetime and large stokes shift [11,12,13]. The response mechanism/principles of MOF-based SRPs will be firstly given, followed by a series of examples of MOFs in sensing applications. Perspective the readers can refer to [14,15,16,17,18,19,20,21,22,23,24]
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