paper 150205063742

Abstract

We report a sensitive all-fiber ammonia gas sensor based on graphene coated mi- crofiber. Through light deposition and interaction with the evanescent filed of the microfiber, the graphene can be effectively coated onto it. The absorbed ammonia gas molecules significantly influent the conductivity of the graphene, resulting in the increase of the refractive index, which makes the transmission optical power change with a sensitivity of 0.1352 dBm/100 ppm and high resolution of 0.74 ppm. The obtained results may have great potential applications in sensing fields with high sensitivity, fast response, easy fabrication and tunable ability.

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Qizhen Sun

Deming Liu

Zhao Huang

Xin Liu

Xiaohui Sun

Ye Yuan

Si Zhu