Publication date: 15th May 2025
Ligand exchange reactions that can bring semiconductor, metal, and magnetic oxide nanocrystals into aqueous solution while maintaining low hydrodynamic size and low non-specific binding are key to employing the unique physical properties of these particles in bioimaging and biosensing applications. Decades of work by many groups have identified examples of small molecules and functionalized synthetic polymers that can be successful in these roles. In recent years, our group has sought to understand how coordination of fluorescent chalcogenide quantum dots is achieved in polar solvents, including water, through such anchoring functional groups as thiolates, imidazoles, and phosphonates. Not only the anchoring functional groups but also the ligand architecture, including the length and sequence of polymers with multiple coordinating residues, influences the strength of binding and the extent of surface coverage.
This poster will present some of our more recent work on polymer coordination, in particular, examining the binding footprint of polymers with anchoring blocks of different lengths on QDs in aqueous solution via techniques including isothermal titration calorimetry. We compare our results with predictions for a lattice model of the nanocrystal surface, and will discuss prospects for extending these studies to additional classes of materials including magnetic oxides.
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