| 초록 |
We introduce two methods to fabricate plasmonic nanostructures for surface enhanced Raman spectroscopy (SERS) substrates. First, we fabricated an ultrahigh density array of silver nanocluster for SERS substrate with high sensitivity and excellent reproducibility at a very large area (wafer scale) based on polystyrene-block-poly(4-vinyl pyridine) copolymer (PS-b-P4VP) micelles. We systematically controlled the gap distance between two neighboring silver nanoclusters ranging from 8 to 61 nm. Fabricated SERS substrate with a gap distance of 8 nm showed very high signal intensity, and excellent reproducibility (less than ± 5%) of the signal intensity. Secondly, we utilized the half-onion like microdomains of polystyrene-block-poly(methyl methacrylate) copolymer (PS-b-PMMA). The concentric ring number of nanopatterns was varied from 5 to 8 depending on the molecule weights of the block copolymer. The substrate containing silver ring nanostructures also shows high SERS signal intensity. |
