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 journalArticlepeer-review

14 Citations (Scopus)


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
Issue number23
Publication statusPublished - 2012 Jun 21

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Chemistry


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