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학술지 In Situ Curing of Sliding SU-8 Droplet over a Microcontact Printed Pattern for Tunable Fabrication of a Polydimethylsiloxane Nanoslit
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저자
김창범, 천홍구, JaeHun Chung, Kwang Ho Lee, Jeong Hoon Lee, 송기봉, 이상훈
발행일
201109
출처
Analytical Chemistry, v.83 no.18, pp.7221-7226
ISSN
0003-2700
출판사
American Chemical Society(ACS)
DOI
https://dx.doi.org/10.1021/ac200859b
협약과제
11SF1300, 생체진단 가능 시각/미각 수용체 기반 센싱 기술 개발, 송기봉
초록
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. © 2011 American Chemical Society.
KSP 제안 키워드
AFM images, Concentration polarization, Electric Double Layer, Hard-soft, Master mold, Microcontact printing(CP), Printed pattern, SU-8, Various conditions, aspect ratio, independent tuning