Fig. 1. GO-enhanced SPR sensor based on side-polished fiber. (a) Schematic of process for fabricating; (b) longitudinal section

Fig. 2. Ultraviolet absorption spectral peak of dispersed aqueous GO sol and inset illustrates Tyndall effect

Fig. 3. SEM images of surface morphology of silver-coated SPR fiber sensor after self-assembly of different films. (a) ODT film; (b) GO film

Fig. 4. AFM image of SPR fiber sensor's surface after self-assembly of GO film

Fig. 5. Platform for in-situ monitoring resonance peak in transmission spectrum of SPR fiber sensor and Teflon reaction cell employed for self-assembly of GO film

Fig. 6. Comparison of resonance peaks in transmission spectra of silver-coated SPR fiber sensor after self-assembly of ODT and GO films

Fig. 7. Performance comparison of GO-enhanced SPR optical fiber sensor in different refractive-index liquids. (a) Comparison of normalized resonance peaks in transmission spectra; (b) resonance wavelength and sensitivity as functions of refractive index