Proceedings of Online school on Fundamentals of Semiconductive Quantum Dots (QDsSCHOOL)
DOI: https://doi.org/10.29363/nanoge.qdsschool.2021.003
Publication date: 30th April 2021
Ligands (aka surfactants, adsorbents, etc) are an essential part of Quantum Dots. In this tutorial talk, I will focus on organic ligands and first explain how they influence the Quantum Dot solubility (aka dispersibility or colloidal stability) in nonpolar and polar solvents. Second, I will introduce Nucleation Magnetic Resonance (NMR) spectroscopy and show how this powerful tool allows (i) discerning bound from free ligands, (ii) quantifying the solvation of the ligand shell (iii) providing access to the (heterogeneous) thermodynamics of ligand binding, etc. We will also discuss the classification of different types of ligands and how one can use this to predict ligand exchange. Finally, note that none of the above is specific for quantum dots but actually applies to all types of nanocrystals.
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