Highly sensitive and selective biosensor based on graphene oxide coated long period grating

M. S. Shaikh; C. Liu; M. Partridge; S. W. James; W. D. Zhu; X. Chen

doi:10.1117/12.2252371

28 February 2017 Highly sensitive and selective biosensor based on graphene oxide coated long period grating

M. S. Shaikh, C. Liu, M. Partridge, S. W. James, W. D. Zhu, X. Chen

Proceedings Volume 10058, Optical Fibers and Sensors for Medical Diagnostics and Treatment Applications XVII; 100580G (2017) https://doi.org/10.1117/12.2252371
Event: SPIE BiOS, 2017, San Francisco, California, United States

Abstract

We propose an optical fiber immunosensor based on graphene oxide coated dual-peak long period grating (GO-dLPG), in which GO-IgG linking layer is used for rapid immunoassays. The binding interaction between antibody and antigen produced a detectable optical signal in terms of grating resonant wavelength shift, which was proportional to the analyte concentration. By deposition of GO overlay, the bulk RI sensitivity of dLPG was enhanced around 150%. The GO-coated dLPG was biofunctionalized by the immobilization of IgG to generate the biosensor. The IgG-bound GO-dLPG was used to detect the anti-IgG and anti-PSA, respectively, demonstrating high sensitivity and selectivity. The GO-dLPG biosensor can be further developed as a biosensing platform with advantages of label-free, real-time and low limit of detection.

Citation Download Citation

M. S. Shaikh, C. Liu, M. Partridge, S. W. James, W. D. Zhu, and X. Chen "Highly sensitive and selective biosensor based on graphene oxide coated long period grating", Proc. SPIE 10058, Optical Fibers and Sensors for Medical Diagnostics and Treatment Applications XVII, 100580G (28 February 2017); https://doi.org/10.1117/12.2252371

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