Graphene optical fiber sensor and preparation method and application thereof

Abstract

The invention relates to a graphene optical fiber sensor and a preparation method and application thereof. The graphene optical fiber sensor comprises a photonic crystal optical fiber and two monomodeoptical fibers, wherein both ends of the photonic crystal optical fiber are respectively coupled with the monomode optical fibers, and optical fiber thick cones with expanded waists are respectivelyformed at two coupling points; a graphene layer is coated at the surface of the photonic crystal optical fiber. The preparation method comprises the following steps of preparing a graphene and PMMA (polymethyl methacrylate) composite film on a copper foil; transferring the composite film to the surface of the photonic crystal optical fiber by a copper dissolving method; removing the PMMA out of the composite film which is transferred to the surface of the photonic crystal optical fiber, and calcining, so as to obtain the graphene optical fiber composite material; respectively coupling the twoends of the graphene optical fiber composite material and the two monomode optical fibers by an optical fiber melting machine, and respectively forming the optical fiber thick cones with expanded waists at the two coupling points, so as to obtain the graphene optical fiber sensor. The graphene optical fiber sensor can be used as a reflectivity sensor, and be effectively applied to detect the concentrations of matters of hydrogen sulfide gas, sugarcane and the like.

Description

technical field [0001] The invention relates to the technical field of sensors, in particular to a graphene optical fiber sensor and its preparation method and application. Background technique [0002] As a new type of two-dimensional nanomaterial, graphene is a carbon allotrope arranged in a hexagonal lattice by a single layer of carbon atoms. It has the characteristics of high strength, almost transparent, large specific surface area, and high stability. It can be used as an adsorption Material. There are a large number of microstructures inside the cross-section of photonic crystal fiber, which makes the operability space large, making it widely used in various fields such as optical communication, optical devices and optical sensing, and the most prominent application in the field of optical fiber sensing. It is a new type of sensing technology with strong anti-electromagnetic interference ability, high insulation, flame-proof and explosion-proof, flexible and flexible...

AI Technical Summary

Problems solved by technology

So far, no work has been reported on a graphene-coated optical fiber with a waist-amplified biconical core as a Mach-Zehnder interferometric refractive index sensor, which can be applied to concentration detection.

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