Regensburg 2019 – scientific programme
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O: Fachverband Oberflächenphysik
O 76: Plasmonics & Nanooptics V: Nanostructures and Nanoantennae
O 76.5: Talk
Thursday, April 4, 2019, 11:30–11:45, H8
Ingenious 3D gap-plasmonic Ag@Ag strawberry galactic nanostructure for SERS detection — •Qun Fu1,2, Huaping Zhao1, and Yong Lei1 — 1Institut für Physik & IMN MacroNano (ZIK), Technische Universität Ilmenau, 98693, Ilmenau, Germany — 2Institute of Nanochemistry and Nanobiology, School of Environmental and Chemical Engineering, Shanghai University, Shanghai, 200444, China
The realization of the strongly confined and enhanced electromagnetic (EM) field with gap-plasmon resonance at ultrasmall (sub-10-nm) gaps is crucial for ultrasensitive SERS (surface-enhanced Raman scattering) detection. However, most traditional methods for creating gap-plasmon are based on the lithography techniques, and it remains a challenge to cost-effectively produce high-density sub-nanometer gaps over large-scale. An ingenious 3D gap-plasmonic Ag@Ag strawberry galactic nanostructure is therefore developed by employing an UTAM (ultrathin alumina mask) nano-patterning process. The UTAM-based nanopatterning strategy enables to fabricating Ag@Ag strawberry galactic nanostructures with multiple ultrasmall SERS hotspots in super-high density and over large scale. A strongly enhanced Raman signal (detection limit of R6G molecule as low as 10-16 M) with good reproducibility is obtained based on Ag@Ag strawberry galactic nanostructures, attributing to the coupling effect at multiple hot spots around the six kinds of nanogaps and the intense EM fields at numerous ordered roughness and tips in two-level particle arrays of this structure.