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Surface Energy-Controlled SERS Substrates for Molecular Concentration at Plasmonic Nanogaps
| Content Provider | Semantic Scholar |
|---|---|
| Author | Park, Sung-Gyu Mun, Chae Won Xiao, Xiaofei Braun, Avi Kim, Sunho Giannini, Vincenzo Maier, Stefan A. Kim, Dongho |
| Copyright Year | 2017 |
| Abstract | 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. |
| Starting Page | 1703376 |
| Ending Page | 1703376 |
| Page Count | 1 |
| File Format | PDF HTM / HTML |
| DOI | 10.1002/adfm.201703376 |
| Volume Number | 27 |
| Alternate Webpage(s) | https://www.gianninilab.com/uploads/5/9/1/9/59196423/17_10_adv_funct_mat.pdf |
| Alternate Webpage(s) | https://doi.org/10.1002/adfm.201703376 |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
