Journal
ADVANCED FUNCTIONAL MATERIALS
Volume 27, Issue 41, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.201703376
Keywords
maskless plasma treatments; molecular concentration; plasmonic nanogaps; surface-enhanced Raman spectroscopy (SERS); surface energy
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Funding
- Fundamental Research Program of the Korean Institute of Materials Science (KIMS) [PNK 5060]
- Basic Science Research Program of the National Research Foundation of Korea (NRF) - Ministry of Science, ICT and Future Planning [NRF-2015R1C1A01053884]
- Lee Family Scholars
- National Research Council of Science & Technology (NST), Republic of Korea [PNK5060] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
- National Research Foundation of Korea [2015R1C1A1A01053884] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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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 degrees on the one hand or a hydrophilic surface with a water contact angle of 40.0 degrees 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.
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