Zeolitic imidazolate framework-8 (ZIF-8) is kind of metal organic framework with exceptional intrinsic properties, high tunability, cost-effective and producible, which has boosted the research development of the field. ZIF-8-based materials have shown high capabilities for multiple purposes as catalysts, capacitors, electrodes, drug delivery systems or adsorption/separation membranes. On the other hand, plasmonic nanoparticles made of Au and/or Ag exhibit unique and tuneable optical properties in the visible-NIR range that have been extendedly exploited in a wide range of applications. Herein, we report the synergistic combination of ZIF-8 and either discrete plasmonic nanoparticles or plasmonic nanoparticle thin-films for fabricating novel plasmonic nanostructures with enhanced properties for sensing and bioimaging. The presence of cetyltrimethyl ammonium bromide (CTAB) plays an important role in the coating and modulation of the ZIF-8 thickness of single nanoparticles. On the other hand, the presence of polyvinylpirrolidone (PVP) plays a key role for the successful ZIF-8 coating of plasmonic thin-films. Finally, we demonstrate the applicability of these plasmonic hybrid platforms for sensing and bioimaging based on Surface-enhanced Raman scattering (SERS).

Plasmonic thin-film-MOF hybrids for sensing applications

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ACS Fall 2022

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