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Journal of Cluster Science

, 22:405 | Cite as

Influence of Surfactants and Charges on CdSe Quantum Dots

  • Ping Yang
  • Sergei Tretiak
  • Sergei Ivanov
Original Paper

Abstract

Surface effects significantly influence the functionality of semiconductor nanocrystals. High quality nanocrystals can be achieved with good control of surface passivation by various hydrophobic ligands. In this work, the chemistry between CdSe quantum dots and common surface capping ligands is investigated using density functional theory (DFT). We discuss the electronic structures and optical properties of small CdSe clusters controlled by their size of particle, self-organization, capping ligands, and positive charges. The chosen model ligands reproduce good structural and energetic description of the interactions between the ligands and quantum dots. In order to capture the chemical nature and energetics of the interactions between the capping ligands and CdSe quantum dots, we found that PMe3 is needed to adequately model trioctylphosphine (TOP), NH3 is sufficient for amines, while OPH2Me could be used to model trioctylphosphine oxide. The relative binding interaction strength between ligands was found to decrease in order Cd–O > Cd–N > Cd–P with average binding energy per ligand being −25 kcal/mol for OPH2Me, −20 kcal/mol for NH3 and −10 kcal/mol for PMe3. Charges on studied stoichiometric clusters were found to have a significant effect on their structures, binding energies, and optical properties.

Keywords

CdSe quantum dots Surface ligands Charges Density functional theory 

Notes

Acknowledgments

PY acknowledges support from Environmental Molecular Sciences Laboratory (a national scientific user facility sponsored by the U.S. Department of Energy’s Office of Biological and Environmental Research) located at Pacific North-west National Laboratory and operated for the DOE by Battelle. ST acknowledges support of the Center for Advanced Solar Photophysics (CASP), an Energy Frontier Research Center funded by the U.S. Department of Energy (DOE). We acknowledge support of Center for Integrated Nanotechnology (CINT) and Center for Nonlinear Studies (CNLS). Los Alamos National Laboratory is operated by Los Alamos National Security, LLC, for the National Nuclear Security Administration of the U.S. Department of Energy under contract DE-AC52-06NA25396.

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Copyright information

© Springer Science+Business Media, LLC 2011

Authors and Affiliations

  1. 1.Environmental Molecular Sciences LaboratoryPacific Northwest National LaboratoryRichlandUSA
  2. 2.Center for Integrated Nanotechnologies (CINT)Los Alamos National LaboratoryLos AlamosUSA

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