Sensitive and Reproducible Gold SERS Sensor Based on Interference Lithography and Electrophoretic Deposition

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Surface-enhanced Raman spectroscopy (SERS) is a promising analytical tool due to its label-free detection ability and superior sensitivity, which enable the detection of single molecules. Since its sensitivity is highly dependent on localized surface plasmon resonance, various methods have been applied for electric field-enhanced metal nanostructures. Despite the intensive research on practical applications of SERS, fabricating a sensitive and reproducible SERS sensor using a simple and low-cost process remains a challenge. Here, we report a simple strategy to produce a large-scale gold nanoparticle array based on laser interference lithography and the electrophoretic deposition of gold nanoparticles, generated through a pulsed laser ablation in liquid process. The fabricated gold nanoparticle array produced a sensitive, reproducible SERS signal, which allowed Rhodamine 6G to be detected at a concentration as low as 10-8 M, with an enhancement factor of 1.25 × 10⁵. This advantageous fabrication strategy is expected to enable practical SERS applications.
Publisher
MDPI
Issue Date
2018-11
Language
English
Article Type
Article
Citation

SENSORS, v.18, no.11

ISSN
1424-8220
DOI
10.3390/s18114076
URI
http://hdl.handle.net/10203/248719
Appears in Collection
ME-Journal Papers(저널논문)
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