Abstract
A simple method for evaluating the conditions of ligands used to stabilize photoluminescent cadmium chalcogenide nanoparticles is reported. Photoluminescence quenching in the presence of electron acceptors was observed for nanoparticles modified with alkylamines and alkanethiols having different chain lengths, which are commonly used as capping ligands for semiconductor nanoparticles. The magnitude of quenching significantly varied with the ligand type and with time after nanoparticle purification; the plots of quenching magnitude against quencher concentration showed unexpected curvatures. For the origin of this curvature to be revealed, a model of the quenching process was established based on the Tachiya model. In this model, the layer of ligands has several voids through which the quenchers are bound to the cores of nanoparticles. An equation was developed by considering the statistical distribution of the number of quenchers attached to a nanoparticle. The analyses of photoluminescence quenching reve...
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