Amphiphilic layer-by-layer assembly overcoming solvent polarity between aqueous and nonpolar media

Minkyung Park, Younghoon Kim, Yongmin Ko, Sanghyuk Cheong, Sook Won Ryu, Jinhan Cho

Research output: Contribution to journalArticlepeer-review

24 Citations (Scopus)

Abstract

We introduce a general and versatile methodology that allows a facile incorporation of the functional components with completely different chemistry of hydrophilic/hydrophobic properties within nanocomposite films, and furthermore combine a number of the distinctive advantages of traditional electrostatic layer-by-layer (LbL) assembly in aqueous media and covalent LbL assembly in nonpolar media. Our approach, amphiphilic LbL assembly, is based on the high affinity between sulfonic (or phosphonic) acid-functionalized materials in aqueous media and hydrophobic metal oxide (or metal) NPs stabilized by oleic acid (OA) in nonpolar solvent. For demonstrating the effectiveness of our approach, we show that amphiphilic LbL assembly can be easily applied to the preparation of functional colloid materials allowing the reversible phase transfer between aqueous and nonpolar media, and supercapacitor electrodes with high volumetric capacitance (280 F·cm-3 at 10 mV·s-1) using reduced graphene oxide with sulfonic acid moieties and well-defined OA-Fe3O4 NPs.

Original languageEnglish
Pages (from-to)17213-17223
Number of pages11
JournalJournal of the American Chemical Society
Volume136
Issue number49
DOIs
Publication statusPublished - 2014 Dec 10

ASJC Scopus subject areas

  • Chemistry(all)
  • Catalysis
  • Biochemistry
  • Colloid and Surface Chemistry

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