Partridge, MatthewJames, StephenShaikh, M. S.Liu, ChenZhu, W. D.Chena, X.2017-09-082017-09-082017-02-28Shaikh MS, Liu C, Partridge M, et al., (2017) Highly sensitive and selective biosensor based on graphene oxide coated long period grating. Proceedings Volume 10085, Optical Fibers and Sensors for Medical Diagnostics and Treatment Applications XVII. SPIE BiOS 2017, 28-29 January 2017, San Francisco, USA, Paper number 100580G1605-7422http://dx.doi.org/10.1117/12.2252371https://dspace.lib.cranfield.ac.uk/handle/1826/12463We 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.en©2017 SPIE. This is the Author Accepted Manuscript. Please refer to any applicable publisher terms of use.Graphene oxideOptical fiber biosensorLong period gratingLabel-freeAntibody-AntigenConference paper