Berlin 2012 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 26: Plasmonics and nanooptics II

O 26.9: Vortrag

Dienstag, 27. März 2012, 12:30–12:45, MA 005

Ordered nanostar arrays as reliable substrates for surface enhanced Raman scattering (SERS) — •Lidiya Osinkina, Theobald Lohmüller, Frank Jäckel, and Jochen Feldmann — Photonics and Optoelectronics Group, Department of Physics and CeNS, Ludwig-Maximilians-Universität München, 80799, Munich, Germany

Multispiked metallic nanoparticles, or "nanostars" - are intriguing substrates for surface enhanced Raman scattering (SERS) spectroscopy due to the strong field enhancements that are emerging on their tips upon excitation with light at their resonance frequency. Exciting optical properties can appear in ordered arrays of SERS active nanoparticles, and arrays of metallic nanostars should therefore have high potential as substrates for sensing and imaging applications.

Here we present a two-step approach to efficiently produce large ordered arrays of gold nanostars by using a combination of block copolymer nanolithography and seeded growth. First, hexagonally ordered arrays of gold nanoparticle seeds are produced on top of a glass substrate. The interparticle distance between the seeds can be changed in a range of 65-100 nm. Second, nanostars, with the average size of 50 nm are grown from these seeds by one-pot synthesis in the aqueous solution. In this work, we will demonstrate that the size of the nanostar and the distances between the particles can be tuned independently, influencing the optical properties and the performance of the SERS active substrates.