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Related Concept Videos

Colloidal precipitates01:09

Colloidal precipitates

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The high insolubility of some precipitates can result in an unfavorable relative supersaturation. This can lead to colloidal particles with a large surface-to-mass ratio, where adsorption is promoted. For instance, in the precipitation of silver chloride, silver ions are adsorbed on the surface of the colloidal particles, forming a primary layer. This layer attracts ions of opposite charge (such as nitrate ions), forming a diffuse secondary layer of adsorbed ions. This electric double layer...
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Synthesis of Ligand-free CdS Nanoparticles within a Sulfur Copolymer Matrix
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Colloidal CdSe nanocrystals are inherently defective.

Tamar Goldzak1,2, Alexandra R McIsaac1, Troy Van Voorhis3

  • 1Department of Chemistry, Massachusetts Institute of Technology, Cambridge, MA, USA.

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|February 10, 2021
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Colloidal cadmium selenide (CdSe) nanocrystals inherently possess dark surface states, even with perfect passivation. These dark states, linked to surface defects, increase with nanocrystal size, impacting their photophysics.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Quantum Chemistry

Background:

  • Colloidal cadmium selenide (CdSe) nanocrystals (NCs) are crucial for technologies like LED displays and medical imaging.
  • The photophysical properties of CdSe NCs are highly sensitive to surface defects.

Purpose of the Study:

  • To investigate the intrinsic defect states in CdSe NCs using computational simulations.
  • To understand the role of surface structure and ligand passivation on the photophysics of CdSe NCs.

Main Methods:

  • Density Functional Theory (DFT) simulations were employed to model CdSe NCs.
  • Analysis of surface structure and electronic states was performed.
  • Simulations included stoichiometric NCs with perfect ligand passivation and varied passivation schemes.

Main Results:

  • CdSe NCs exhibit intrinsic dark, surface-associated excitations dominating the low-energy spectrum, even without vacancies or defects.
  • The number of these dark states increases with the size of the CdSe NCs.
  • Hole localization on two-coordinate selenium atoms was identified as a primary cause of these dark states.

Conclusions:

  • Ligand passivation has a limited effect on the number of intrinsic dark states in CdSe NCs.
  • The findings suggest that photochemistry and photoinduced charge transfer in CdSe NCs may be more facile than previously assumed.
  • A deeper understanding of these intrinsic defects is crucial for optimizing CdSe NC applications.