Preparation of Fluorous Solvent-Dispersed Fe3O4 Nanocrystals: Role of Oxygen in Ligand Exchange

Youngsun Kim, Sangyoup Lee, Sehoon Kim

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

Perfluorinated ligand-passivated Fe3O4 nanocrystals were prepared through a biphasic ligand exchange method. It was found that dissolved oxygen in the reaction media predominantly determined the degree of ligand exchange and the resultant dispersion property of nanocrystals in a fluorous solvent. X-ray photoelectron spectroscopic analyses revealed that dissolved oxygen molecules bind to the surface iron species of nanocrystals in competition with the carboxylate moiety of ligands during the exchange reaction, lowering the degree of ligand exchange and colloidal stability significantly. Reducing the oxygen content of the fluorous phase by N2 bubbling was found to result in a highly stable dispersion of phase-transferred Fe3O4 nanocrystals with a single-particle size distribution maintained for a few months.

Original languageEnglish
Pages (from-to)3348-3353
Number of pages6
JournalLangmuir
Volume32
Issue number14
DOIs
Publication statusPublished - 2016 Apr 12
Externally publishedYes

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Spectroscopy
  • Electrochemistry

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