TY - JOUR
T1 - Binding and Packing in Two-Component Colloidal Quantum Dot Ligand Shells: Linear Versus Branched Carboxylates
AU - De Nolf, Kim
AU - Cosseddu, Salvatore M.
AU - Jasieniak, Jacek J.
AU - Drijvers, Emile
AU - Martins, Jose C.
AU - Infante, Ivan
AU - Hens, Zeger
N1 - doi: 10.1021/jacs.6b11328
PY - 2017/2/13
Y1 - 2017/2/13
N2 - In this work, we present a combined experimental and theoretical analysis of two-component ligand shells passivating CdSe quantum dots. Using nuclear magnetic resonance spectroscopy, we first show that exposing oleate capped quantum dots to primary carboxylic acids results in a one-for-one exchange that preserves the overall ligand surface concentration. Exposure to straight-chain acids leads to a binary ligand shell that behaves as an ideal mixture and that has a composition matching the overall acid composition of the dispersion. In the case of branched-chain acids, the exchange is restricted to about 25% of the original ligands. Based on molecular dynamics simulations, we argue that this behavior reflects the more favorable packing of oleates compared to branched carboxylates on the (100) facets of CdSe quantum dots.
AB - In this work, we present a combined experimental and theoretical analysis of two-component ligand shells passivating CdSe quantum dots. Using nuclear magnetic resonance spectroscopy, we first show that exposing oleate capped quantum dots to primary carboxylic acids results in a one-for-one exchange that preserves the overall ligand surface concentration. Exposure to straight-chain acids leads to a binary ligand shell that behaves as an ideal mixture and that has a composition matching the overall acid composition of the dispersion. In the case of branched-chain acids, the exchange is restricted to about 25% of the original ligands. Based on molecular dynamics simulations, we argue that this behavior reflects the more favorable packing of oleates compared to branched carboxylates on the (100) facets of CdSe quantum dots.
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U2 - 10.1021/jacs.6b11328
DO - 10.1021/jacs.6b11328
M3 - Article
SN - 0002-7863
VL - 139
SP - 3456
EP - 3464
JO - Journal of the American Chemical Society
JF - Journal of the American Chemical Society
IS - 9
ER -