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ACS Appl Mater Interfaces. 2017 Oct 25;9(42):37201-37209. doi: 10.1021/acsami.7b11506. Epub 2017 Oct 10.

Droplet-Guiding Superhydrophobic Arrays of Plasmonic Microposts for Molecular Concentration and Detection.

Author information

1
Department of Chemical and Biomolecular Engineering (BK21+ Program), KAIST , Daejeon 34141, Korea.
2
Nano-Convergence Mechanical Systems Research Division, Korea Institute of Machinery and Materials , Daejeon 34103, Korea.
3
Department of Nanomechatronics, Korea University of Science and Technology , Daejeon 34113, Korea.

Abstract

Droplet-guiding superhydrophobic SERS substrates are created by a combinatorial lithographic technique. Photolithography defines the pattern of a micropillar array with a radial density gradient, whereas colloidal lithography features a nanotip array on the top surface of each micropillar. The nanotip array renders the surface superhydrophobic, and the pattern of micropillars endows the radial gradient of the contact angle, enabling the spontaneous droplet migration toward the center of the pattern. Water droplets containing target molecules are guided to the center, and the molecules dissolved in the droplets are concentrated at the surface of the central micropillar during droplet evaporation. Therefore, the molecules can be analyzed at the predefined position by Raman spectra without scanning the entire substrate. At the same time, the SERS-active nanotip array provides high sensitivity of Raman measurement.

KEYWORDS:

colloidal lithography; concentration; photolithography; superhydrophobic; surface-enhanced Raman scattering

PMID:
28944652
DOI:
10.1021/acsami.7b11506

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