Kinetically driven self-assembly of a binary solute mixture with controlled phase separation via electro-hydrodynamic flow of corona discharge

Hee Joon Jung, June Huh, Cheolmin Park

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

This feature article describes a new and facile process to fabricate a variety of thin films of non-volatile binary solute mixtures suitable for high performance organic electronic devices via electro-hydrodynamic flow of conventional corona discharge. Both Corona Discharge Coating (CDC) and a modified version of CDC, Scanning Corona Discharge Coating (SCDC), are based on utilizing directional electric flow, known as corona wind, of the charged uni-polar particles generated by corona discharge between a metallic needle and a bottom plate under a high electric field (5-10 kV cm-1). The electric flow rapidly spreads out the binary mixture solution on the bottom plate and subsequently forms a smooth and flat thin film in a large area within a few seconds. In the case of SCDC, the static movement of the bottom electrode on which a binary mixture solution is placed provides further control of thin film formation, giving rise to a film highly uniform over a large area. Interesting phase separation behaviors were observed including nanometer scale phase separation of a polymer-polymer binary mixture and vertical phase separation of a polymer-organic semiconductor mixture. Core-shell type phase separation of either polymer-polymer or polymer-colloidal nanoparticle binary mixtures was also developed with a periodically patterned microstructure when the relative location of the corona wind was controlled to a binary solution droplet on a substrate. We also demonstrate potential applications of thin functional films with controlled microstructures by corona coating to various organic electronic devices such as electroluminescent diodes, field effect transistors and non-volatile polymer memories.

Original languageEnglish
Pages (from-to)6219-6234
Number of pages16
JournalNanoscale
Volume4
Issue number20
DOIs
Publication statusPublished - 2012 Oct 21
Externally publishedYes

Fingerprint

Phase separation
Discharge (fluid mechanics)
Self assembly
Polymers
Hydrodynamics
Binary mixtures
Coatings
Thin films
Scanning
Microstructure
Semiconducting organic compounds
Field effect transistors
Needles
Diodes
Electric fields
Nanoparticles
Data storage equipment
Electrodes
Substrates

ASJC Scopus subject areas

  • Materials Science(all)

Cite this

Kinetically driven self-assembly of a binary solute mixture with controlled phase separation via electro-hydrodynamic flow of corona discharge. / Jung, Hee Joon; Huh, June; Park, Cheolmin.

In: Nanoscale, Vol. 4, No. 20, 21.10.2012, p. 6219-6234.

Research output: Contribution to journalArticle

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