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Symmetric Metal Organic Framework-Plasmonic Architectures for Reversible and High-Sensitivity Optical Sensing.

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We developed a novel plasmonic sensing platform using metal-organic framework (MOF) films and 2D nanoparticle gratings. This hybrid system offers tunable optical properties for highly sensitive environmental sensing applications.

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Area of Science:

  • Nanophotonics
  • Materials Science
  • Chemical Sensing

Background:

  • Plasmonic nanostructures manipulate light at the nanoscale.
  • Their optical response is sensitive to environmental changes, enabling sensing applications.
  • Metal-organic frameworks (MOFs) offer tunable refractive indices.

Purpose of the Study:

  • To develop a versatile and highly sensitive plasmonic sensing platform.
  • To combine surface lattice resonances (SLRs) with the tunable refractive index of ZIF-8 MOF films.
  • To investigate different configurations of ZIF-8/plasmonic grating hybrids for enhanced sensing.

Main Methods:

  • Fabrication of 2D plasmonic arrays using templated-assisted assembly of metal colloids.
  • Integration of ZIF-8 MOF films with plasmonic gratings.
  • Modulation of SLRs via solvent exchange in ZIF-8 for refractive index tuning.
  • Characterization of different ZIF-8/grating configurations (on top, embedded).

Main Results:

  • Achieved dynamic and reversible ON/OFF tuning of SLR response with ZIF-8 films on gratings.
  • Explored the impact of refractive index mismatch between substrate and ZIF-8.
  • Demonstrated enhanced sensing performance with gratings embedded in ZIF-8, reaching a sensitivity of 427 ± 19 nm·RIU⁻¹.
  • Identified optimal ZIF-8/plasmonic grating configurations for sensing.

Conclusions:

  • MOF-plasmonic hybrids represent a promising platform for responsive and tunable nanophotonic sensing.
  • The developed platform enables next-generation optical sensing with high sensitivity and tunability.
  • This work paves the way for advanced sensor development utilizing hybrid nanomaterials.