Surface Energy-Controlled SERS Substrates for Molecular Concentration at Plasmonic Nanogaps
| Autor: | Vincenzo Giannini, Avi Braun, Xiaofei Xiao, Sunho Kim, Stefan A. Maier, ChaeWon Mun, Sung-Gyu Park, Dong-Ho Kim |
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| Přispěvatelé: | Korea Institute of Materials Science, National Research Foundation of Korea, Ministry of Science, ICT and Future Planning (South Korea), Engineering and Physical Sciences Research Council (UK), Office of Naval Research (US) |
| Rok vydání: | 2017 |
| Předmět: |
Materials science
Evaporation Nanotechnology 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Surface energy 0104 chemical sciences Electronic Optical and Magnetic Materials Biomaterials Contact angle Condensed Matter::Materials Science symbols.namesake Monolayer Electrochemistry symbols Wetting 0210 nano-technology Raman spectroscopy Plasmon Nanopillar |
| Zdroj: | Digital.CSIC. Repositorio Institucional del CSIC instname |
| ISSN: | 0105-3884 |
| Popis: | 8 pags., 6 figs. Positioning probe molecules at electromagnetic hot spots with nanometer precision is required to achieve highly sensitive and reproducible surface-enhanced Raman spectroscopy (SERS) analysis. In this article, molecular positioning at plasmonic nanogaps is reported using a high aspect ratio (HAR) plasmonic nanopillar array with a controlled surface energy. A large-area HAR plasmonic nanopillar array is generated using a nanolithography-free simple process involving Ar plasma treatment applied to a smooth polymer surface and the subsequent evaporation of metal onto the polymer nanopillars. The surface energy can be precisely controlled through the selective removal of an adsorbed self-assembled monolayer of low surface-energy molecules prepared on the plasmonic nanopillars. This process can be used to tune the surface energy and provide a superhydrophobic surface with a water contact angle of 165.8° on the one hand or a hydrophilic surface with a water contact angle of 40.0° on the other. The highly tunable surface wettability is employed to systematically investigate the effects of the surface energy on the capillary-force-induced clustering among the HAR plasmonic nanopillars as well as on molecular concentration at the collapsed nanogaps present at the tops of the clustered nanopillars. This study was supported financially by the Fundamental Research Program (PNK 5060) of the Korean Institute of Materials Science (KIMS). Dr. S.-G. Park is grateful for support from the Basic Science Research Program of the National Research Foundation of Korea (NRF), funded by the Ministry of Science, ICT and Future Planning (Grant No. NRF-2015R1C1A01053884). X. Xiao is grateful for support from the Lee Family Scholars. A.B. and S.A.M. acknowledge the EPSRC and ONR Global |
| Databáze: | OpenAIRE |
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