| 초록 |
Sensor platforms with high sensitivity and low fabrication cost are important for a wide range of applications for molecular analysis. Surface-Enhanced Raman Scattering (SERS) is one of the most promising means to identify and quantify unknown molecules. However, it is still challenging to concentrate molecules and deposit them in local area. To address this, we design omniphobic SERS-active substrates. Omniphobic surface exhibits high contact angles for liquids with a wide range of polarity, enabling localized concentration. We create pagoda-like nanopillar array of which side wall is undulated through combination of interference lithography and standing wave effect. The surface undulation serve as hot spots and the series of sharp edges can pin air-liquid interface, thereby maintaining omniphobic properties. With omniphobic SERS-active structures, we can concentrate analyte molecules regardless of solvents and enhance SERS intensity, achieving very low limit of detection. |
