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Sensors 2018, 18(11), 4076; https://doi.org/10.3390/s18114076

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

Department of Mechanical Engineering, Korea Advanced Institute of Science and Technology, Daejeon 34141, Korea
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Received: 12 October 2018 / Revised: 19 November 2018 / Accepted: 20 November 2018 / Published: 21 November 2018
(This article belongs to the Special Issue Applications of Raman Spectroscopy in Sensors)
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Abstract

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. View Full-Text
Keywords: surface enhanced Raman spectroscopy; gold nanoparticle array; laser interference lithography; electrophoretic deposition; pulsed laser ablation in liquid surface enhanced Raman spectroscopy; gold nanoparticle array; laser interference lithography; electrophoretic deposition; pulsed laser ablation in liquid
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Hwang, J.S.; Yang, M. Sensitive and Reproducible Gold SERS Sensor Based on Interference Lithography and Electrophoretic Deposition. Sensors 2018, 18, 4076.

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