DNA-mediated plasmonic nanogap engineering for highly efficient SERS probes

Jeong-Wook Oh

doi:10.1117/12.3028851

4 October 2024 DNA-mediated plasmonic nanogap engineering for highly efficient SERS probes

Jeong-Wook Oh

Author Affiliations +

Proceedings Volume 13117, Enhanced Spectroscopies and Nanoimaging 2024; 131170P (2024) https://doi.org/10.1117/12.3028851
Event: Nanoscience + Engineering, 2024, San Diego, California, United States

Abstract

Plasmonic nanogaps can intensify electromagnetic (EM) fields in their confined narrow areas, providing superior optical enhancement such as surface-enhanced Raman scattering (SERS). Although a narrower nanogap is more beneficial in magnifying the EM field, the highest SERS efficiency occurs in ~1 nm nanogap due to the quantum tunneling effect in sub-nm nanogap. We synthesized ~1-nm plasmonic nanogap embedded nanoparticles with nanobridges, producing a strong SERS signal. The nanogaps can be controlled by DNA sequence, DNA grafting density, and solution condition. Nanogap thickness, the number of nanobridges, and surface morphology can control the EM field within ~1-nm intra-nanogap, which determines the SERS feature of the nanoprobes.

Conference Presentation

Citation Download Citation

Jeong-Wook Oh "DNA-mediated plasmonic nanogap engineering for highly efficient SERS probes", Proc. SPIE 13117, Enhanced Spectroscopies and Nanoimaging 2024, 131170P (4 October 2024); https://doi.org/10.1117/12.3028851

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