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Panagiota Bika a , Vasileios K. E-mail: t. CuFeS 2 is a prominent chalcogenide that possesses similar optical properties and a significantly lower cost, compared to gold. Additionally, covalent organic frameworks are a class of materials at the forefront of current research, mainly used as photoactive components and porous absorbers. Hence, in this work, hydrophilic CuFeS 2 particles are coupled with multi-functional covalent organic frameworks through ionic bonding to produce a hybrid material with unique and optimized properties.
To render the CuFeS 2 particles negatively charged and dispersible in water, we coated them with sodium dodecyl sulfonate, shifting the surface plasmon resonance of the nanoparticles from to nm. When they are electrostatically assembled with the positively charged COFs, an S-scheme is formed and the fluorescence of the hybrid materials is highly quenched, with the electron transfer happening from the networks to the nanoparticles and a simultaneous energy exchange which is dependent on the emission wavelength.
Through detailed fluorescence spectroscopy, time-resolved measurements and SternβVolmer analysis, we identified an efficient emission quenching that differs from the bulk to the exfoliated hybrid system, while detailed electron microscopy studies demonstrated the strong interaction between the two components.
The quenching mechanisms and the on or off surface resonance dependent lifetime could be applied to photocatalytic and photovoltaic applications. Furthermore, hybrid systems of 0D plasmonic nanomaterials with 3D and 2D semiconductors are creating several types of heterojunction systems 13 and have new features since additional pathways across the interface become available for the generation of charge carriers and the subsequent energy conversion.
Four types of transfer mechanisms from plasmonic nanoparticles to the semiconductor are determined: light scattering, light concentration, hot electron injection and plasmon-induced resonance transfer.