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

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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.
Publisher
AMER CHEMICAL SOC
Issue Date
2017-10
Language
English
Article Type
Article
Keywords

ENHANCED RAMAN-SCATTERING; AG NANOCUBES; SURFACE; PLATFORM; NANOPARTICLES; SPECTROSCOPY; PHOTORESIST; WETTABILITY; SUBSTRATE; WATER

Citation

ACS APPLIED MATERIALS & INTERFACES, v.9, no.42, pp.37201 - 37209

ISSN
1944-8244
DOI
10.1021/acsami.7b11506
URI
http://hdl.handle.net/10203/227205
Appears in Collection
CBE-Journal Papers(저널논문)
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