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Hong B, Sun A, Pang L, et al. Integration of Faradaic electrochemical impedance spectroscopy into a scalable surface plasmon biosensor for in tandem detection. Opt Express. 2015;23(23):30237-49doi: 10.1364/OE.23.030237.
Hong, B., Sun, A., Pang, L., Venkatesh, A. G., Hall, D., & Fainman, Y. (2015). Integration of Faradaic electrochemical impedance spectroscopy into a scalable surface plasmon biosensor for in tandem detection. Optics express, 23(23), 30237-49. https://doi.org/10.1364/OE.23.030237
Hong, Brandon, et al. "Integration of Faradaic electrochemical impedance spectroscopy into a scalable surface plasmon biosensor for in tandem detection." Optics express vol. 23,23 (2015): 30237-49. doi: https://doi.org/10.1364/OE.23.030237
Hong B, Sun A, Pang L, Venkatesh AG, Hall D, Fainman Y. Integration of Faradaic electrochemical impedance spectroscopy into a scalable surface plasmon biosensor for in tandem detection. Opt Express. 2015 Nov 16;23(23):30237-49. doi: 10.1364/OE.23.030237. PMID: 26698504.
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Opt Express. 2015 Nov 16;23(23):30237-49. doi: 10.1364/OE.23.030237.

Integration of Faradaic electrochemical impedance spectroscopy into a scalable surface plasmon biosensor for in tandem detection.

Optics express

Brandon Hong, Alexander Sun, Lin Pang, A G Venkatesh, Drew Hall, Yeshaiahu Fainman

PMID: 26698504 DOI: 10.1364/OE.23.030237

Abstract

We present an integrated label-free biosensor based on surface plasmon resonance (SPR) and Faradaic electrochemical impedance spectroscopy (f-EIS) sensing modalities, for the simultaneous detection of biological analytes. Analyte detection is based on the angular spectroscopy of surface plasmon resonance and the extraction of charge transfer resistance values from reduction-oxidation reactions at the gold surface, as responses to functionalized surface binding events. To collocate the measurement areas and fully integrate the modalities, holographically exposed thin-film gold SPR-transducer gratings are patterned into coplanar electrodes for tandem impedance sensing. Mutual non-interference between plasmonic and electrochemical measurement processes is shown, and using our scalable and compact detection system, we experimentally demonstrate biotinylated surface capture of neutravidin concentrations as low as 10 nM detection, with a 5.5 nM limit of detection.

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