Size-Dependent Ligand Layer Dynamics in Semiconductor Nanocrystals Probed by Anisotropy Measurements

Ido Hadar, Tsafrir Abir, Shira Halivni, Adam Faust, Uri Banin*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

12 Scopus citations


Colloidal semiconductor nanocrystals (NC) have reached a high level of synthetic control allowing the tuning of their properties, and their use in various applications. However, the surface of NCs and in particular their size-dependent capping organic ligand behavior, which play an important role in the NC synthesis, dispersibility, and optoelectronic properties, is still not well understood. We study the size-dependent properties of the ligand shell on the surface of NCs, by embedding surface bound dyes as a probe within the ligand shell. The reorientation times for these dyes show a linear dependence on the NC surface curvature indicating size-dependent change in viscosity, which is related to a change in the density of the ligand layer because of the geometry of the surface, a unique feature of NCs. Understanding the properties of the ligand shell will allow rational design of the surface to achieve the desired properties, providing an additional important knob for tuning their functionality. Dynamic properties of a ligand shell: The size-dependent dynamic properties of an organic ligand shell, capping the surface of colloidal nanocrystals, have been studied by probing polarized emission of surface-bound organic dyes (see picture). These properties affect the synthesis, dispersibility, and optoelectronic features of colloidal nanocrystals.

Original languageAmerican English
Pages (from-to)12463-12467
Number of pages5
JournalAngewandte Chemie - International Edition
Issue number42
StatePublished - 1 Oct 2015

Bibliographical note

Publisher Copyright:
© 2015 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.


  • fluorescence spectroscopy
  • nanocrystals
  • nanotechnology
  • polarized spectroscopy
  • surface chemistry


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