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Sensitivity and Stability Enhancement of Surface Plasmon Resonance Biosensors based on a Large-Area Ag/MoS2 Substrate

1
Advanced Institutes of Convergence Technology, Seoul National University, Suwon 16229, Korea
2
College of Electronics and Information, Dept. of Biomedical Engineering, Kyung Hee University, Yongin 17104, Korea
3
School of East-west Medical Science, Kyung Hee University, Yongin 17104, Korea
4
School of Advanced Materials Engineering, Kookmin University, Seoul 02707, Korea
*
Author to whom correspondence should be addressed.
These authors contributed equally to this work.
Sensors 2019, 19(8), 1894; https://doi.org/10.3390/s19081894
Received: 8 March 2019 / Revised: 10 April 2019 / Accepted: 16 April 2019 / Published: 21 April 2019
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Abstract

Surface plasmon resonance (SPR) sensors based on a silver film suffer from signal degradation due to silver oxidation in aqueous sensing environments. To overcome this limitation, we fabricated the planar plasmonic substrate employing an atomic MoS2 layer on a silver surface. Successful production of a large-area MoS2 monolayer blocks the penetration of oxygen and water molecules. In addition, we theoretically and experimentally found that MoS2 layer on the silver film can improve the SPR sensitivity and stability significantly. In this study, the proposed SPR substrate has the potential to provide highly enhanced sensor platforms for surface-limited molecular detections. View Full-Text
Keywords: surface plasmon resonance; biosensor; MoS2 monolayer; oxidation; sensitivity enhancement surface plasmon resonance; biosensor; MoS2 monolayer; oxidation; sensitivity enhancement
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Kim, N.-H.; Choi, M.; Kim, T.W.; Choi, W.; Park, S.Y.; Byun, K.M. Sensitivity and Stability Enhancement of Surface Plasmon Resonance Biosensors based on a Large-Area Ag/MoS2 Substrate. Sensors 2019, 19, 1894.

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