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Preparation method of D-type plastic optical fiber based on graphene gold film and application of preparation method in an SPR biosensor

A technology of plastic optical fiber and olefinic gold film, which is applied in the application field of SPR biosensors, can solve the problems of reducing the detection sensitivity and the low sensitivity of the optical fiber of the SPR sensor, etc., and achieve the effects of enhancing detection sensitivity, improving detection sensitivity, and increasing energy loss

Inactive Publication Date: 2019-05-31
SHANDONG NORMAL UNIV
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  • Abstract
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  • Application Information

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Problems solved by technology

[0007] The present invention provides a kind of preparation method of D-type plastic optical fiber based on graphene gold film in order to solve the problem that the optical fiber sensitivity of prior art SPR sensor is not high, can make graphene layer and gold film layer contact seamlessly, avoid Copper atoms remain after etching, thus eliminating the problem that the existing optical fiber sensor preparation method inevitably reduces the detection sensitivity

Method used

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  • Preparation method of D-type plastic optical fiber based on graphene gold film and application of preparation method in an SPR biosensor
  • Preparation method of D-type plastic optical fiber based on graphene gold film and application of preparation method in an SPR biosensor
  • Preparation method of D-type plastic optical fiber based on graphene gold film and application of preparation method in an SPR biosensor

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preparation example Construction

[0054] The invention provides a kind of preparation method based on the D-type plastic optical fiber of graphene gold film, comprises the following steps:

[0055] (1) Select a section of the plastic optical fiber as the sensing area, the plastic optical fiber includes a core and a cortex wrapping the core, and removes a part of the cortex and the core of the sensing area along the axial direction of the sensing fiber to obtain a D-shaped structure; The section of the D-shaped structure perpendicular to the axial direction of the plastic optical fiber is D-shaped, and the D-shaped structure forms a cut surface along the optical fiber axis;

[0056] (2) grow a graphene layer on one side of the copper foil to obtain a copper foil / graphene material;

[0057] (3) coating gold film layer on the graphene surface of copper foil / graphene material, obtains copper foil / graphene / gold material;

[0058] (4) Soak copper foil / graphene / gold material in ferric chloride solution to obtain gra...

Embodiment 1

[0081] Cut the plastic optical fiber into 15 cm long slices, the plastic optical fiber includes a core and a cortex wrapping the core. Select the length of 1cm as the sensing area, and remove part of the core and skin of the sensing area by side polishing along the axial direction of the plastic optical fiber to form a D-shaped structure. The interface between the D-shaped structure and the axial direction of the plastic optical fiber is D-shaped. Side polishing removes part of the surface of the core and skin to form a cut surface. The D-form structure was then rinsed with deionized water to remove impurities.

[0082] Grow single-layer graphene on high-purity copper foil, and cut the copper foil / graphene into 1.5cm*0.5cm rectangular strips. A 50nm-thick gold film is formed on the graphene surface of the cut copper foil / graphene by sputtering technology to obtain a copper foil / graphene / gold material. The thickness of the gold film deposited on the graphene / copper film can b...

Embodiment 2

[0092] This embodiment detects the sensitivity of the D-type sensing fiber

[0093] The SRP sensor includes: a focused light source, a transmission fiber, the D-type sensing fiber prepared in Example 1 or Comparative Example 1, a spectrometer and a computer, wherein the focused light source and the D-type sensing fiber are connected through the transmission fiber, and the D-type sensing fiber and the spectrometer The spectrometer is connected to the computer through the transmission fiber connection, and the data is collected and output through the Morpho software in the computer. That is, the Au D-type SPR sensor and the G / Au D-type SPR sensor are obtained.

[0094] In the present invention, the D-type sensing optical fibers prepared in Comparative Example 1 and Example 1 are soaked in deionized water (1.333) and ethanol solutions with mass concentrations of 10%, 20%, 30% and 50% (refractive index ( RI) between 1.339~1.3583), utilize above-mentioned SPR sensor to measure the...

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Abstract

The invention provides a preparation method of a D-type plastic optical fiber based on a graphene gold film and application of the preparation method in an SPR biosensor. The invention relates to thetechnical field of optical fiber sensors. The preparation method comprises the following steps: firstly coating a gold film with a copper foil / graphene material, enabling the gold film layer to be seamlessly attached to the graphene layer, and then etching the obtained copper foil / graphene / gold material with ferric chloride solution to remove the copper foil, so as to obtain a graphene / gold material; and attaching the gold film layer in the graphene / gold material to the cut surface of the D-type plastic optical fiber so as to obtain the D-type plastic optical fiber. The gold film layer and thegraphene layer in the D-type plastic optical fiber prepared by the preparation method disclosed by the invention are seamlessly bonded, so the interference of copper atoms is eliminated, and the detection sensitivity can reach 1,219.95 nm / RIU. Compared with the sensitivity of an optical fiber sensor obtained by sequentially attaching a gold film layer and a graphene layer to a D-type optical fiber in the prior art, the sensitivity of the optical fiber sensor is remarkably improved.

Description

technical field [0001] The invention relates to the technical field of optical fiber sensors, in particular to a method for preparing a D-shaped plastic optical fiber based on a graphene gold film and its application in SPR biosensors. Background technique [0002] Surface plasmon resonance (SPR), as an advanced label-free real-time optical analysis technique, has been widely used in food safety, medical diagnosis and other fields. SPR is often referred to as the quantum of charge density oscillations at metal-medium intersections excited by transverse magnetic (TM) polarized electromagnetic waves. Photon-electron coupling resonant excitation occurs when the wave vector of the incident light matches that of the surface plasmon. In this way, the shift of the resonance position can be used to detect small changes in the refractive index of the sensing region. Based on this phenomenon, two main types of SPR sensors, prism SPR and fiber optic SPR (FOSPR), have been developed. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/01G01N21/552
Inventor 姜守振龚微霍燕燕申沂明左子谭王志豪
Owner SHANDONG NORMAL UNIV
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