Dresden 2011 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 43: Nanoparticles and Composite Materials I
CPP 43.14: Vortrag
Donnerstag, 17. März 2011, 17:45–18:00, ZEU 222
Highly uniform SERS substrates formed by wrinkle-confined drying of gold colloids — Nicolás Pazos-Pérez1, Alexandra Schweikart1, Andrea Fortini1, Matthias Schmidt1, Ramon Álvarez-Puebla2, Luis M. Liz-Marzan2, and •Andreas Fery1 — 1PC II and TP II, University of Bayreuth, Germany — 2PC, University of Vigo, Spain
Metallic nanoparticles, exhibit electric and optical properties which are size and shape dependent. Therefore, they are ideal candidates for many applications. Big effort has been put in developing new methods to control their shape and size. These achievements allow us to fine tune the materials properties in order to use them for a desired application. However, the lack of capability to form organized structures is still a very important challenge in order to use these materials in many applications. In this work we report a novel method to structure, in a macroscale range, arrays of organized gold colloids into 1 and 2D linear parallel arrays which are highly uniform substrates for Surface Enhanced Raman Scattering (SERS). These structures were fabricated through self-assembly of gold nanoparticles upon solution-drying in a periodic confining structure. The technique leads to uniform, parallel linear nanoparticle arrays with the precise arrangement defined through the dimensions of the particles and the grooves. Moreover, the good reproducibility of these structures among big areas, make them perfect candidates as ultrasensitive substrates for SERS due to the formation of controlled Hot Spots arrays. Which provide high and uniform SERS enhancement over extended areas.