Solvent-free nanoparticle fluids with highly collective functionalities for layer-by-layer assembly

Younghoon Kim, Donghee Kim, Ilyoung Kwon, Hyun Wook Jung, Jinhan Cho

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

Here we demonstrate the successful preparation of solvent-free inorganic nanoparticle (NP) fluids with high functionalities that allow mass production. The inorganic NPs (Ag, Au, and quantum dots [QDs]) used in this study were directly synthesized using hydrophobic stabilizers such as palmitic acid, oleic acid, or tetraoctylammonium bromide in a nonpolar solvent (chloroform or toluene), and these NPs were directly phase-transferred to solvent-free low molecular weight liquid media (i.e., thiol-containing imidazolium-type ionic liquid). The NP fluids formed at room temperature showed excellent functionalities (i.e., long-term dispersion stability, high electrical conductivity, strong optical energy transfer, and high photoluminescent intensity) without requiring any additional process such as anion exchange or thermal processing. Furthermore, layer-by-layer deposition of QDs stabilized by the ionic liquid induced highly fluorescent properties compared to those of layer-by-layer QD multilayers prepared using conventional ligands such as mercaptoacetic acid or cysteamine, which mainly originated from the high packing density and the relatively high quantum efficiency of ionic liquid-stabilized QDs.

Original languageEnglish
Pages (from-to)11488-11493
Number of pages6
JournalJournal of Materials Chemistry
Volume22
Issue number23
DOIs
Publication statusPublished - 2012 Jun 21

Fingerprint

Ionic Liquids
Semiconductor quantum dots
Ionic liquids
Nanoparticles
Fluids
Palmitic acid
Cysteamine
Palmitic Acid
Oleic acid
Toluene
Oleic Acid
Chloroform
Chlorine compounds
Quantum efficiency
Sulfhydryl Compounds
Energy transfer
Anions
Ion exchange
Multilayers
Negative ions

ASJC Scopus subject areas

  • Materials Chemistry
  • Chemistry(all)

Cite this

Solvent-free nanoparticle fluids with highly collective functionalities for layer-by-layer assembly. / Kim, Younghoon; Kim, Donghee; Kwon, Ilyoung; Jung, Hyun Wook; Cho, Jinhan.

In: Journal of Materials Chemistry, Vol. 22, No. 23, 21.06.2012, p. 11488-11493.

Research output: Contribution to journalArticle

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