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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 3: Crystallization, Nucleation and Self-Assembly I
CPP 3.11: Talk
Monday, March 18, 2024, 12:30–12:45, H 0110
Enhancing SERS Sensitivity and Uniformity through Directional Self-Assembly of Plasmonic Nanoparticle Lattices — •Sezer Seçkin1 and Tobias A. F. König1,2 — 1Leibniz-Institut für Polymerforschung e.V., Hohe Straße 6, 01069 Dresden — 2Center for Advancing Electronics Dresden, Technische Universität Dresden, 01062 Dresden
Despite recent developments, surface-enhanced Raman spectroscopy (SERS) applications face challenges in achieving high sensitivity and uniform signals over a large area. Using the directional self-assembly of plasmonic nanoparticles in lattice structures, we show how one can increase the SERS signal 43-fold over randomly aligned gold nanoparticles without relying on the photoluminescence of Rhodamine 6G [Seçkin et al., ACS Appl. Mater. Interfaces 2023, 15(36), 43124-43134]. We have chosen the lattice constant for an off-resonant case that matches the lattice resonance and super-radiant plasmon mode along the particle chain. Supported by electromagnetic simulations, we analyze the radiative components of the plasmon modes by varying the particle size while keeping the lattice periodicity constant. We perform polarization-dependent SERS measurements and compare them with other SERS excitation wavelengths. Using the self-assembled plasmonic particle lattice [Gupta et al., Adv. Funct. Mater. 2021, 31(36) 2105054], we have developed an effective SERS substrate that provides a significantly higher signal with 73% less surface coverage. This colloidal approach enables the cost-effective and scalable fabrication of sensitive, uniform, and polarization-dependent SERS substrates.
Keywords: plasmonic nanoparticles; self-assembly; grating; Rayleigh anomaly; SERS