SERS Platforms of Plasmonic Hydrophobic Surfaces for Analyte Concentration: Hierarchically Assembled Gold Nanorods on Anodized Aluminum |
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Authors: | Moritz Tebbe Pavel Cherepanov Ekaterina V Skorb Sergey K Poznyak Javier García de Abajo Andreas Fery Daria V Andreeva Ramon A Alvarez Puebla Nicolas Pazos‐Perez |
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Institution: | 1. Physical Chemistry II, Universit?t Bayreuth, , Bayreuth, Germany;2. Max Planck Institute of Colloids and Interfaces, Wissenschaftspark Golm, , Golm, 14424 Germany;3. Chemistry Department, Belarusian State University, , Minsk, 220030 Belarus;4. ICREA, , 08010 Barcelona, Spain;5. ICFO – The Institute of Photonic Sciences, Mediterranean Technology Park, , 08860 Castelldefels ‐ Barcelona, Spain;6. Departamento de Quimica Fisica e Inorganica, Universitat Rovira i Virgili and Centro de Tecnologia Quimica de Catalu?a, , 43007 Tarragona, Spain;7. Medcom Advance, Viladecans Business Park ‐ Edificio Brasil, , 08840 Viladecans – Barcelona, Spain |
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Abstract: | Efficient and homogeneous surface‐enhanced Raman scattering (SERS) substrates are usually prepared using lithographic approaches, physical evaporation, or in situ chemical reduction. However, these approaches are time‐consuming, expensive, and very difficult to upscale. Alternatively, template‐assisted approaches using colloidal suspensions of preformed nanoparticles have become more popular because of their low cost, fast production, and ability to be scaled up easily. One of the limitations of these methods is the dimensions of the structured surfaces. In this context, a new method for designing low‐cost, up‐scalable surface patterns that match building block dimensionality based on anodization of aluminum, enabling a hierarchical organization of anisotropic nanoparticles, is presented. The proposed new technology starts with anodized aluminum oxide with regular parallel linear periodicities. To produce a highly efficient plasmonic surface, gold nanorods are assembled into parallel lines where the long axes of the Au rods are also oriented along the substrate lines, thus inducing reproducible tip‐to‐tip plasmonic coupling with the corresponding generation of highly active hotspots. Additionally, this advanced material presents an inherent hydrophobicity that can be exploited as a method for concentration of analytes on the surface. SERS detection is demonstrated with benzenethiol and 2‐naphtoic acid. |
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Keywords: | surface‐enhanced Raman scattering gold nanorods anodization porous alumina linear arrays |
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