2 research outputs found
Droplet-Guiding Superhydrophobic Arrays of Plasmonic Microposts for Molecular Concentration and Detection
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
Droplet-Guiding Superhydrophobic Arrays of Plasmonic Microposts for Molecular Concentration and Detection
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