In situ curing of sliding SU-8 droplet over a microcontact printed pattern for tunable fabrication of a polydimethylsiloxane nanoslit

Chang Beom Kim, Honggu Chun, Jaehun Chung, Kwang Ho Lee, Jeong Hoon Lee, Ki Bong Song, Sang Hoon Lee

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

A tunable process for polydimethylsiloxane (PDMS) nanoslit fabrication is developed for nanofluidic applications. A microcontact printing (μCP) of a laterally spreading self-assembled hexadecanethiol (HDT) layer, combined with in situ curing of a sliding SU-8 droplet, enables precise and independent tuning of a nanoslit-mold width and height using a single μCP master mold. The SU-8 nanoslit-mold is replicated using a hard-soft composite PDMS to prevent channel collapse at low (<0.2) aspect ratio (height over width). The fluidic characteristics as well as dimensions of nanoslits fabricated with various conditions are analyzed using a fluorescein sample and AFM images. Finally, concentration polarization-based sample preconcentration is successfully demonstrated at the nanoslit boundary where an electric double-layer is overlapped.

Original languageEnglish
Pages (from-to)7221-7226
Number of pages6
JournalAnalytical Chemistry
Volume83
Issue number18
DOIs
Publication statusPublished - 2011 Sep 15

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Curing
Nanofluidics
Fabrication
Fluidics
Fluorescein
Printing
Aspect ratio
Tuning
Polarization
Composite materials
baysilon
hexadecanethiol

ASJC Scopus subject areas

  • Analytical Chemistry

Cite this

In situ curing of sliding SU-8 droplet over a microcontact printed pattern for tunable fabrication of a polydimethylsiloxane nanoslit. / Kim, Chang Beom; Chun, Honggu; Chung, Jaehun; Lee, Kwang Ho; Lee, Jeong Hoon; Song, Ki Bong; Lee, Sang Hoon.

In: Analytical Chemistry, Vol. 83, No. 18, 15.09.2011, p. 7221-7226.

Research output: Contribution to journalArticle

Kim, Chang Beom ; Chun, Honggu ; Chung, Jaehun ; Lee, Kwang Ho ; Lee, Jeong Hoon ; Song, Ki Bong ; Lee, Sang Hoon. / In situ curing of sliding SU-8 droplet over a microcontact printed pattern for tunable fabrication of a polydimethylsiloxane nanoslit. In: Analytical Chemistry. 2011 ; Vol. 83, No. 18. pp. 7221-7226.
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