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

Youngsun Kim; Sangyoup Lee; Sehoon Kim

doi:10.1021/acs.langmuir.6b00526

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

Youngsun Kim, Sangyoup Lee, Sehoon Kim

Research output: Contribution to journal › Article › peer-review

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 language	English
Pages (from-to)	3348-3353
Number of pages	6
Journal	Langmuir
Volume	32
Issue number	14
DOIs	https://doi.org/10.1021/acs.langmuir.6b00526
Publication status	Published - 2016 Apr 12
Externally published	Yes

ASJC Scopus subject areas

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

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title = "Preparation of Fluorous Solvent-Dispersed Fe3O4 Nanocrystals: Role of Oxygen in Ligand Exchange",

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.",

author = "Youngsun Kim and Sangyoup Lee and Sehoon Kim",

note = "Funding Information: This work is supported by grants from the Korea Institute of Energy Technology Evaluation and Planning (No. 20142020103790) and the Intramural Research Program of KIST. Publisher Copyright: {\textcopyright} 2016 American Chemical Society. Copyright: Copyright 2016 Elsevier B.V., All rights reserved.",

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AU - Kim, Youngsun

AU - Lee, Sangyoup

AU - Kim, Sehoon

N1 - Funding Information: This work is supported by grants from the Korea Institute of Energy Technology Evaluation and Planning (No. 20142020103790) and the Intramural Research Program of KIST. Publisher Copyright: © 2016 American Chemical Society. Copyright: Copyright 2016 Elsevier B.V., All rights reserved.

PY - 2016/4/12

Y1 - 2016/4/12

N2 - 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.

AB - 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.

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