Abstract
The effect of different amines on the fluorescence of quantum dots has been discussed in the literature but the mechanism involved is not fully understood. We have studied the interaction of core CdSequantum dots of different sizes and core-shell CdSequantum dots with tertiary amines, such as aliphatic amines (triethylamine) and bicyclic amines (DABCO and quinuclidine), using fluorescence techniques. Fluorescence quantum yield decreases with increasing concentration of the amine following a linear Stern-Volmer behaviour (Kq = 80-330 M-1), but relatively small changes were observed in the fluorescence lifetimes. In order to get insights into the mechanism involved, small nanoparticles (2.1 nm) were synthesized and the interaction QD surface-amine was analysed by NMR and FTIR spectroscopy.
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Electronic supplementary information (ESI) available: Fig. SI-1-SI-8. See DOI: 10.1039/b807580h
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Galian, R.E., Scaiano, J.C. Fluorescence quenching of CdSequantum dots by tertiary amines and their surface binding effect. Photochem Photobiol Sci 8, 70–74 (2009). https://doi.org/10.1039/b807580h
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DOI: https://doi.org/10.1039/b807580h