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- aggregation classification "A1".
- aggregation creator person.
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- aggregation date "2010".
- aggregation format "application/pdf".
- aggregation hasFormat 1044641.bibtex.
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- aggregation isPartOf urn:issn:0002-7863.
- aggregation language "eng".
- aggregation rights "I have transferred the copyright for this publication to the publisher".
- aggregation subject "Chemistry".
- aggregation title "Utilizing self-exchange to address the binding of carboxylic acid ligands to CdSe quantum dots".
- aggregation abstract "We use solution NMR techniques to analyze the organic/inorganic interface of CdSe quantum dots (Q-CdSe) synthesized using oleic acid as a surfactant. It is shown that the resulting Q-CdSe are stabilized by tightly bound oleic acid species that only exchange upon addition of free oleic acid. The NMR analysis points toward a two-step exchange mechanism where free ligands are initially physisorbed within the ligand shell to end up as bound, chemisorbed ligands in a second step. Importantly, we find that every ligand is involved in this exchange process. By addition of oleic acid with a deuterated carboxyl headgroup, we demonstrate that the bound ligands are oleate ions and not oleic acid molecules. This explains why a dynamic adsorption/desorption equilibrium only occurs in the presence of excess free oleic acid, which donates the required proton. Comparing the number of oleate ligands to the excess cadmium per CdSe quantum dot, we find a ratio of 2:1. This completes the picture of Q-CdSe as organic/inorganic entities where the surface excess of Cd2+ is balanced by a double amount of oleate ligands, yielding overall neutral nanoparticles.".
- aggregation authorList BK454521.
- aggregation endPage "10201".
- aggregation issue "29".
- aggregation startPage "10195".
- aggregation volume "132".
- aggregation aggregates 1044701.
- aggregation isDescribedBy 1044641.
- aggregation similarTo ja104351q.
- aggregation similarTo LU-1044641.