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Optical fiber sensor based on graphene-based composite structure and preparation method thereof

A fiber optic sensor and composite structure technology, applied in the direction of instruments, optics, light guides, etc., can solve the problems of limited adsorption capacity, achieve the effects of increased sensitivity, faster resistance change rate, and enhanced exposure

Active Publication Date: 2020-07-14
XI'AN PETROLEUM UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, a large number of studies have shown that the chemical inertness of carbon atoms itself makes intrinsic graphene limited in its ability to adsorb molecules or atoms.

Method used

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  • Optical fiber sensor based on graphene-based composite structure and preparation method thereof
  • Optical fiber sensor based on graphene-based composite structure and preparation method thereof
  • Optical fiber sensor based on graphene-based composite structure and preparation method thereof

Examples

Experimental program
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preparation example Construction

[0032] refer to image 3 , the present invention is based on the preparation method of graphene-based composite structure optical fiber sensor, comprises the steps:

[0033] S1, preparing a graphene substrate, forming a graphene film 2 on the upper surface of the glass slide 4;

[0034] S2, the sensor body structure 1 is obtained by using the fusion tapering method, and the waist region 1-1 of the sensor body structure 1 is in the micro-nano scale;

[0035] S3, placing the waist region 1-1 of the sensor body structure 1 on the surface of the graphene substrate; using the magnetron sputtering method, sputtering metal oxide on the exposed surface of the waist region 1-1 and the surface of the graphene substrate, The bare surface of the region 1-1 and the surface of the graphene substrate form a metal oxide film 3 with gas-sensing properties, and the waist region 1-1 and the graphene substrate are bonded together through the metal oxide film 3 to form a sensing region.

[0036]...

Embodiment

[0051] like image 3 As shown, the preparation method of the present embodiment based on the graphene-based composite structure optical fiber sensor comprises the following steps:

[0052] (a) graphene film 2 is placed on the surface of slide glass 4;

[0053] (b) The waist region 1-1 of the transfer sensor body structure 1 is placed flat on the top of the graphene film 2;

[0054] (c) by WO 3 For the target sputtering waist region 1-1, WO 3 The particles are sputtered on the exposed surface of the waist region and the surface of the graphene film 2, and form WO 3 Nanofilm, WO 3 The nano-film bonded the waist region 1-1 and the graphene film 2 to obtain graphene and WO 3 A light sensor with a composite structure, that is, a fiber sensor based on a graphene-based composite structure of the present invention.

[0055] The following is the detailed structure and characteristics of each step:

[0056] Preparation of graphene paper substrate by vacuum filtration technology ...

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Abstract

The invention discloses an optical fiber sensor based on a graphene-based composite structure and a preparation method thereof. The sensor comprises a sensor body structure processed by a fused biconical taper method, and the waist area of the sensor body structure is in a micro-nano scale; the waist area is arranged on the surface of the graphene film; gas-sensitive metal oxide films are sputtered on the exposed surface of the waist region and the surface of the graphene film; the waist region and the graphene film are connected into an integrated structure through the metal oxide film; a sensing area of a one-dimensional columnar structure formed by an optical fiber is extended and coupled into a sensing area of a two-dimensional structure; according to the sensor disclosed in the invention, the action range of an evanescent field is expanded, and the excellent mechanical property and adsorption property of graphene are combined, so that on the premise of ensuring the sensitivity ofthe sensor, the conical region structure of the sensing region is effectively fastened, the waist region of the optical fiber is completely protected from being damaged, and the practicability of thesensor is enhanced. The detection sensitivity and the response rate of the optical fiber sensor can be further improved.

Description

technical field [0001] The invention belongs to the technical field of optical fiber sensors, and in particular relates to an optical fiber sensor based on a graphene-based composite structure and a preparation method thereof. Background technique [0002] As a new type of two-dimensional carbon nanomaterial, graphene has attracted the interest of researchers in related fields due to its excellent physical and chemical properties, highly ordered structure and strong mechanical stability. Due to its large specific surface area and high stability, it is a very ideal gas adsorption material reported so far. When graphene adsorbs certain molecules or atoms on the surface, the charges of the adsorbed object and graphene will transfer to each other, resulting in changes in the density of carrier electrons or holes, and the conductivity of graphene will also change accordingly. , at the same time, because graphene has a large specific surface area, it will have high sensitivity wh...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/12G01N21/45G02B6/255
CPCG01N27/127G01N21/45G02B6/2552G01N2021/4126G01N2021/458Y02P70/50
Inventor 陈海霞徐超丁继军傅海威靳岩鑫李辉栋刘颖刚
Owner XI'AN PETROLEUM UNIVERSITY
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