Enhanced surface plasmon resonance fiber sensor based on Graphene Oxide

Abstract

We demonstrated a Graphene Oxide (GO) enhanced Surface Plasmon Resonance (SPR) sensor based on silver-coated side-polished fiber. GO nano-sheets were decorated on the Octadecanethiol (ODT)-silver surface of the side-polished fiber, which enhance the interaction between the SPR wave and molecules near the sensing surface. Experimental results demonstrate that the sensitivity of the GO-modified SPR sensor enhance to 2252.0 nm/RIU, compared with the traditional silver-coated SPR sensor of 1523.5 nm/RIU, which is improved 1.48 times. Meanwhile, ODT and GO films protect the silver-based SPR sensor from degradation and improved the stability of the silver-based SPR sensor. The proposed fiber sensor can be used as promising candidate in portable testing instruments with high immobilization ability for biochemical sensing application.