4.8 Article

Concurrent Imaging of Surface-Enhanced Raman and Mie Scattering from Built-in Nanogap Plasmonic Particles

Journal

JOURNAL OF PHYSICAL CHEMISTRY LETTERS
Volume 12, Issue 25, Pages 5889-5896

Publisher

AMER CHEMICAL SOC
DOI: 10.1021/acs.jpclett.1c01524

Keywords

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Funding

  1. National Research Foundation (NRF) of Korea [NRF-2018R1A2B3001049]
  2. Science Research Center (SRC) - NRF [NRF-2017R1A5A1015365]
  3. NRF - MSIT [NRF-2019R1A2C1010514]
  4. KRICT [KK2032-10]
  5. National Research Foundation of Korea (NRF) - Korea government (MSIT) [2019R1C1C1002802]
  6. Korea Basic Science Institute (National Research Facilities and Equipment Center) - Ministry of Education [NRF2020R1A6C101B194]
  7. National Research Council of Science & Technology (NST) grant by MSIT [CRC-16-01-KRICT]
  8. National Research Foundation of Korea [2019R1C1C1002802] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)

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A bimodal imaging method was developed to spatially resolve and correlate SERS and Mie scattering signals. By examining different types of nanoparticle assemblies, distinct behaviors between intra- and interparticle nanogaps were observed. The study demonstrated the potential of this dual-imaging approach for improving the reliability of SERS measurements.
We report a bimodal imaging method that can spatially resolve and concurrently correlate SERS and background-free Mie scattering signals. By examining two types of nanoparticle assemblies with different types of plasmonic junctions, namely raspberry-like metamolecules (raspberry-MMs) containing intraparticle nanogaps and groups of Au nanocubes forming interparticle gaps, we were able to rapidly screen SERS-active particles among the entire population of nanoparticles. Ratiometric analysis of SERS/ Mie scattering revealed distinct behaviors for these intra- and interparticle nanogaps. In particular, raspberry-MMs showed a high fraction of SERS-active particles with the SERS intensity essentially insensitive to the nanoparticle aggregation state and a predictable environmental dependence. In comparison, nanocube clusters exhibited highly heterogeneous SERS/Mie scattering ratios and unpredictable intensity fluctuations but higher maximum SERS intensity. This dual-imaging approach constitutes an in situ visualization tool that enables simultaneous and stoichiometric analysis of dual signals consisting of elastic and inelastic scattering, which can significantly improve the reliability of SERS measurements.

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