Department of Physical Chemistry and Inorganic, Universitat Rovira i Virgili, Spain,
Medcom Advance, Spain, 3Institució Catalana de Recerca i Estudis Avançats, Spain email@example.com
Surface enhance Raman scattering (SERS) spectroscopy is a powerful ultrasensitive technique which allows detection down to single molecule levels. The production of SERS substrates is mainly based on the generation of hot spots created by plasmonic nanoparticles. However, the lack of capability to form reproducible organized structures at large scales, is still a very important challenge to solve in order to control the plasmonic intercoupling between particles. This, is a crucial point for their incorporation into new technological devices. Therefore, it is clear that their controlled organization in 2D and 3D structures is of key importance to produce homogeneous and reproducible SERS intensities over large areas.
In this work we report novel methods to produce organized structures of plasmonic nanoparticles. These organizations can be done either at the macroscale or at the nanoscale using completely lithography-free approaches. Macroscale organizations as monolayers, supercrystals, and periodic linear arrays with tunable width and spacing were created via spin coating, confinement controlled drying, and the combination of both techniques. Nanoscale assemblies of particle clusters with variable coordination numbers (dimmers, trimmers, tetrahedrons...) were performed through the controllable droplet drying of a microemulsion.
These structures, were effectively use for sensing using SERS showing very good reproducibility among big areas. This fact, make them perfect candidates as ultrasensitive substrates for SERS due to the controlled formation of hot spots. Which provide high and uniform SERS enhancement over extended areas.
Dr. Nicolas Pazos Perez
Universitat Rovira i Virgili
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