In this work, a graphene oxide-coated long period fibre grating (GO-LPG) is proposed for chemical sensing application. Graphene oxide (GO) has been deposited on the surface of long period grating to form a sensing layer which significantly enhances the interaction between LPG propagating light and the surrounding-medium. The sensing mechanism of GO-LPG relies on the change of grating resonance intensity against surrounding-medium refractive index (SRI). The proposed GO-LPG has been used to measure the concentrations of sugar aqueous solutions. The refractive index sensitivities with 99.5 dB/RIU in low refractive index region (1.33-1.35) and 320.6 dB/RIU in high index region (1.42-1.44) have been achieved, showing an enhancement by a factor of 3.2 and 6.8 for low and high index regions, respectively. The proposed GO-LPG can be further extended to the development of optical biochemical sensor with advantages of high sensitivity, real-time and label-free sensing.
|Title of host publication||Sixth European Workshop on Optical Fibre Sensors|
|Place of Publication||Bellingham, WA (US)|
|Number of pages||4|
|Publication status||Published - 30 May 2016|
|Event||6th European Workshop on Optical Fibre Sensors - Ireland, Limerick, Ireland|
Duration: 31 May 2016 → 3 Jun 2016
|Conference||6th European Workshop on Optical Fibre Sensors|
|Abbreviated title||EWOFS 2016|
|Period||31/05/16 → 3/06/16|
Bibliographical note-Chen Liu; Qi Cai; Zhongyuan Sun; Baojian Xu; Jianlong Zhao; Lin Zhang and Xianfeng Chen; "Fibre optic chemical sensor based on graphene oxide-coated long period grating", Proc. SPIE 9916, Sixth European Workshop on Optical Fibre Sensors, 99160V (May 30, 2016).
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- APTES salinization
- chemical sensor
- graphene oxide
- long period grating