4.6 Article

DNA-mediated control of Au shell nanostructure and controlled intra-nanogap for a highly sensitive and broad plasmonic response range

Journal

JOURNAL OF MATERIALS CHEMISTRY C
Volume 3, Issue 41, Pages 10728-10733

Publisher

ROYAL SOC CHEMISTRY
DOI: 10.1039/c5tc01915j

Keywords

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Funding

  1. National Research Foundation [2013R1A1A1061387]
  2. KU-KIST research funds
  3. KRICT [SI-1509]
  4. Industrial Strategic Technology Development Program - Ministry of Trade, Industry, and Energy (MI, Korea) [10033183, 10037397]
  5. Degree and Research Center (DRC) Program through the National Research Council of Science & Technology (NST) from the Ministry of Science, ICT and Future Planning
  6. Public Welfare & Safety Research Program through NRF - MEST [2011-0020957]

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We report DNA-mediated simple synthetic methods to obtain anisotropic plasmonic nanostructures with a tailorable intra-nanogap distance ranging from 0.9 to 4.0 nm. Anisotropic half-shell structures with sub-1.0 nm intra-nanogaps showed a wavelength-independent surface-enhanced Raman scattering (SERS) intensity and a highly sensitive SERS response to NIR light. We found that the reaction conditions such as pH and NaCl concentration are responsible for the resulting shell structures and intra-nanogap distances. Three noticeable plasmonic nanostructures [i.e., half-shell with sub-1.0 nm nanogaps, closed-shell with a wide nanogap (2.1 nm) and star-shaped with an irregular nanogap (1.5-4.0 nm)] were synthesized, and solution-based and single particle-based Raman measurements showed a strong relationship between the plasmonic structures and the SERS intensity. An understanding of DNA-mediated control for nanogap-engineered plasmonic nanostructures and studies of SERS-activity relationships using single particle-correlated measurements can provide new insights into the design of new plasmonic nanostructures and SERS-based biosensing applications.

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