| 초록 |
Surface-enhanced Raman scattering(SERS) has been widely used to characterize molecular structure and detect single molecule. For real SERS application, fabrication of sub-10 nm nanogap with well-defined and large-area uniformity is the most important issue. To develop more efficient sensor, designing of near-field localization properties of plasmonic nanostructures is another key factor. In this work, we introduce a reproducible and highly-throughput method to make sub-10 nm gap array with ultra-high density and precise gap size control by combining colloidal lithography and directed self-assembly of block copolymers(BCPs). By controlling the total molecular weight of block copolymers(BCPs) and nanosphere diameter, the gap distance and near-field focusing properties are accurately tuned. Surface-enhanced raman scattering(SERS) measurements show that concentric nanofocusing structure with sub-10 nm gap arrays has advantage for practical applications. |
