In-situ Spectroscopic Characterization of a Solution-Phase X-Type Ligand Exchange at Colloidal Lead Sulphide Quantum Dot Surfaces

Matthew Beard, Arthur Nozik, Daniel Kroupa, Nicholas Anderson, Chloe Castaneda

Research output: Contribution to journalArticlepeer-review

33 Scopus Citations

Abstract

We employed quantitative NMR spectroscopy and spectrophotometric absorbance titration to study a quantum dot X-type ligand exchange reaction. We find that the exchange is highly cooperative, where at low extents of exchange the change in free energy of the reaction, ΔGXC, is ∼11 kJ mol-1 while at higher extents of exchange ΔGXC saturates to ∼-4 kJ mol-1. A modified Fowler binding isotherm is developed to describe the reaction.

Original languageAmerican English
Pages (from-to)13893-13896
Number of pages4
JournalChemical Communications
Volume52
Issue number96
DOIs
StatePublished - 2016

Bibliographical note

Publisher Copyright:
© The Royal Society of Chemistry.

NREL Publication Number

  • NREL/JA-5900-67253

Keywords

  • ligand exchange
  • PbS QDs
  • QD surface chemistry
  • solar-photochemistry

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