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Updated: May 17, 2025
Author Spotlight: Tracking Electrochemistry on Single Nanoparticles with Surface-Enhanced Raman Scattering Spectroscopy and Microscopy
Published on: May 12, 2023
Well-defined assembly of plasmonic metal nanoparticles by dielectrophoresis for highly sensitive SERS-active
Yun Su Yeo1,2, Jaejun Park1,2, Sunghoon Yoo1,2
1Department of Applied Chemistry, Hanyang University ERICA, Ansan, 15588, Republic of Korea. leeshyun@hanyang.ac.kr.
Abstract:
In this study, dielectrophoresis (DEP) was performed to develop highly sensitive surface- enhanced Raman scattering (SERS)-active substrates for molecular sensing. Substrates with a circular hole pattern were used, and plasmonic particles were trapped and immobilized along the edges of the pattern using dielectrophoretic forces. The arranged particles created hotspots, resulting in an enhanced SERS signal that was detectable even at concentrations as low as 10-10 M. This uniform arrangement provided a consistent signal over a large area. In addition, it was experimentally verified that the behavior of the particles varied with pattern diameter. This phenomenon was further supported by theoretical analysis. The proposed DEP-based SERS substrates are expected to be useful in various applications due to their excellent reproducibility and reliability.
