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Binding and packing in two-component colloidal quantum dot ligand shells : linear versus branched carboxylates

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Center for nano- and biophotonics (NB-Photonics)
Abstract
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 oleatecapped 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.
Keywords
GOLD NANOPARTICLES, MOLECULAR-DYNAMICS, CDSE NANOCRYSTALS, HOT, INJECTION, EXCHANGE, GROWTH, DISPLACEMENT, MONOLAYERS, DOMAINS, SOLUTE

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Chicago
De Nolf, Kim, Salvatore M Cosseddu, Jacek J Jasieniak, Emile Drijvers, José Martins, Ivan Infante, and Zeger Hens. 2017. “Binding and Packing in Two-component Colloidal Quantum Dot Ligand Shells : Linear Versus Branched Carboxylates.” Journal of the American Chemical Society 139 (9): 3456–3464.
APA
De Nolf, K., Cosseddu, S. M., Jasieniak, J. J., Drijvers, E., Martins, J., Infante, I., & Hens, Z. (2017). Binding and packing in two-component colloidal quantum dot ligand shells : linear versus branched carboxylates. JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 139(9), 3456–3464.
Vancouver
1.
De Nolf K, Cosseddu SM, Jasieniak JJ, Drijvers E, Martins J, Infante I, et al. Binding and packing in two-component colloidal quantum dot ligand shells : linear versus branched carboxylates. JOURNAL OF THE AMERICAN CHEMICAL SOCIETY. 2017;139(9):3456–64.
MLA
De Nolf, Kim, Salvatore M Cosseddu, Jacek J Jasieniak, et al. “Binding and Packing in Two-component Colloidal Quantum Dot Ligand Shells : Linear Versus Branched Carboxylates.” JOURNAL OF THE AMERICAN CHEMICAL SOCIETY 139.9 (2017): 3456–3464. Print.
@article{8518887,
  abstract     = {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 oleatecapped 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 {\textacutedbl}branched carboxylates on the (100) facets of CdSe quantum dots.},
  author       = {De Nolf, Kim and Cosseddu, Salvatore M and Jasieniak, Jacek J and Drijvers, Emile and Martins, Jos{\'e} and Infante, Ivan and Hens, Zeger},
  issn         = {0002-7863},
  journal      = {JOURNAL OF THE AMERICAN CHEMICAL SOCIETY},
  language     = {eng},
  number       = {9},
  pages        = {3456--3464},
  title        = {Binding and packing in two-component colloidal quantum dot ligand shells : linear versus branched carboxylates},
  url          = {http://dx.doi.org/10.1021/jacs.6b11328},
  volume       = {139},
  year         = {2017},
}

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