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Surface chemistry of CdTe quantum dots synthesized in mixtures of phosphonic acids and amines: formation of a mixed ligand shell

(2013) JOURNAL OF PHYSICAL CHEMISTRY C. 117(27). p.13936-13943
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Center for nano- and biophotonics (NB-Photonics)
Abstract
Solution nuclear magnetic resonance (NMR) spectroscopy is used to analyze the surface chemistry of CdTe quantum dots (QDs) synthesized in the presence of tetradecylphosphonic acid and oleylamine. The resulting CdTe QDs have a mixed capping, composed of tightly bound phosphonate anhydride and amine ligands. The overall ligand density is relatively low, which concurs with a low Cd excess in the QDs. We find that upon addition of oleic acid, neither amine or phosphonate anhydride ligands are released from the QDs. On the other hand, the addition of phosphonic acids to CdTe QDs partially capped by oleic acid moieties through a high temperature ligand exchange process leads to the ready, one-to-one release of oleic acid. A full thermodynamic analysis of the phosphonate/carboxylate exchange is however not possible since the exchange appears to be modified by the forced ligand exchange used to replace phosphonate by carboxylate ligands.
Keywords
SIZE, HETEROSTRUCTURES, HOT-INJECTION, MAGNETIC-RESONANCE-SPECTROSCOPY, COLLOIDAL NANOCRYSTALS, CDS NANOCRYSTALS, NMR-SPECTROSCOPY, NANOPARTICLES, COEFFICIENT, PRECURSOR

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Citation

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Chicago
Hassinen, Antti, Raquel Filipa Gomes Pinto Fernandes, Kim De Nolf, Qiang Zhao, André Vantomme, José Martins, and Zeger Hens. 2013. “Surface Chemistry of CdTe Quantum Dots Synthesized in Mixtures of Phosphonic Acids and Amines: Formation of a Mixed Ligand Shell.” Journal of Physical Chemistry C 117 (27): 13936–13943.
APA
Hassinen, A., Gomes Pinto Fernandes, R. F., De Nolf, K., Zhao, Q., Vantomme, A., Martins, J., & Hens, Z. (2013). Surface chemistry of CdTe quantum dots synthesized in mixtures of phosphonic acids and amines: formation of a mixed ligand shell. JOURNAL OF PHYSICAL CHEMISTRY C, 117(27), 13936–13943.
Vancouver
1.
Hassinen A, Gomes Pinto Fernandes RF, De Nolf K, Zhao Q, Vantomme A, Martins J, et al. Surface chemistry of CdTe quantum dots synthesized in mixtures of phosphonic acids and amines: formation of a mixed ligand shell. JOURNAL OF PHYSICAL CHEMISTRY C. 2013;117(27):13936–43.
MLA
Hassinen, Antti, Raquel Filipa Gomes Pinto Fernandes, Kim De Nolf, et al. “Surface Chemistry of CdTe Quantum Dots Synthesized in Mixtures of Phosphonic Acids and Amines: Formation of a Mixed Ligand Shell.” JOURNAL OF PHYSICAL CHEMISTRY C 117.27 (2013): 13936–13943. Print.
@article{4225590,
  abstract     = {Solution nuclear magnetic resonance (NMR) spectroscopy is used to analyze the surface chemistry of CdTe quantum dots (QDs) synthesized in the presence of tetradecylphosphonic acid and oleylamine. The resulting CdTe QDs have a mixed capping, composed of tightly bound phosphonate anhydride and amine ligands. The overall ligand density is relatively low, which concurs with a low Cd excess in the QDs. We find that upon addition of oleic acid, neither amine or phosphonate anhydride ligands are released from the QDs. On the other hand, the addition of phosphonic acids to CdTe QDs partially capped by oleic acid moieties through a high temperature ligand exchange process leads to the ready, one-to-one release of oleic acid. A full thermodynamic analysis of the phosphonate/carboxylate exchange is however not possible since the exchange appears to be modified by the forced ligand exchange used to replace phosphonate by carboxylate ligands.},
  author       = {Hassinen, Antti and Gomes Pinto Fernandes, Raquel Filipa and De Nolf, Kim and Zhao, Qiang and Vantomme, Andr{\'e} and Martins, Jos{\'e} and Hens, Zeger},
  issn         = {1932-7447},
  journal      = {JOURNAL OF PHYSICAL CHEMISTRY C},
  keyword      = {SIZE,HETEROSTRUCTURES,HOT-INJECTION,MAGNETIC-RESONANCE-SPECTROSCOPY,COLLOIDAL NANOCRYSTALS,CDS NANOCRYSTALS,NMR-SPECTROSCOPY,NANOPARTICLES,COEFFICIENT,PRECURSOR},
  language     = {eng},
  number       = {27},
  pages        = {13936--13943},
  title        = {Surface chemistry of CdTe quantum dots synthesized in mixtures of phosphonic acids and amines: formation of a mixed ligand shell},
  url          = {http://dx.doi.org/10.1021/jp4008575},
  volume       = {117},
  year         = {2013},
}

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