A kind of graphene/gold/D type plastic optical fiber SPR sensor and preparation method

A technology of plastic optical fiber and graphene, which is applied in the direction of instruments, scientific instruments, analytical materials, etc., can solve problems such as the difficulty of growing graphene structures, and achieve the effects of improving chemical stability, high sensitivity, and enhancing oscillation

Active Publication Date: 2021-10-19
SHANDONG NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, when this method prepares the plastic optical fiber whose core layer is PMMA, it is not suitable to add the graphene layer by removing PMMA in the wet transfer, and it is even more unsuitable to cover it directly with a layer of metal in a tube furnace with too high temperature. The method of growing graphene; in addition, this method grows graphene directly on gold or silver, but in CVD growing graphene, only growing on copper foil can guarantee the quality of graphene enough, and can grow large-area single Crystalline graphene, it is difficult to grow ideal graphene structure on gold and silver

Method used

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  • A kind of graphene/gold/D type plastic optical fiber SPR sensor and preparation method
  • A kind of graphene/gold/D type plastic optical fiber SPR sensor and preparation method
  • A kind of graphene/gold/D type plastic optical fiber SPR sensor and preparation method

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Embodiment 1

[0040] A preparation method of graphene / gold / D-type plastic optical fiber SPR sensor, comprising the following preparation steps:

[0041] (1) Make D-type optical fiber: a section of 15cm plastic optical fiber (material is PMMA) with a diameter of 1 micron, remove the fiber cladding and part of the core in the sensing area by side polishing method, and open a length of 1cm, depth Groove-shaped sensing area 30% of fiber diameter. The D-type sensing area is then rinsed with deionized water to remove impurities;

[0042] (2) growth graphene: the copper foil after polishing is put into tube furnace, by passing into the mixed gas of the hydrogen of 50sccm and 50sccm methane in tube furnace, keep 30min under 1000 °, graphene layer number is monolayer, then cut the graphene / copper foil into small rectangular stripes (1.2cm×0.5cm);

[0043] (3) The gold film is directly thermally evaporated onto the graphene: put a 7.5cm high-purity gold wire into a molybdenum boat (length: 100mm, w...

Embodiment 2

[0046] A preparation method of graphene / gold / D-type plastic optical fiber SPR sensor, comprising the following preparation steps:

[0047] (1) Make D-shaped optical fiber: a section of 15cm plastic optical fiber (material is PMMA) with a diameter of 1 micron, remove the fiber cladding and part of the core in the sensing area by side polishing, and open a length of 2cm, depth Groove-shaped sensing area 45% of fiber diameter. The D-type sensing area is then rinsed with deionized water to remove impurities;

[0048] (2) growth graphene: the copper foil after polishing is put into tube furnace, by passing into the mixed gas of the hydrogen of 60sccm and 40sccm methane in tube furnace, keep 30min under 1000 °, graphene layer number is 3 layers, then cut the graphene / copper foil into small rectangular stripes (2cm×0.5cm);

[0049] (3) Gold film is directly thermally evaporated onto graphene: put 8.5cm high-purity gold wire into a molybdenum boat (100mm in length, 10mm in width, an...

Embodiment 3

[0052] A preparation method of graphene / gold / D-type plastic optical fiber SPR sensor, comprising the following preparation steps:

[0053] (1) Make a D-type optical fiber: a section of 15cm, a plastic optical fiber (material is PMMA) with a diameter of 1 micron, remove the fiber cladding and part of the core in the sensing area by side polishing, and set a length of 1.2cm, Groove-shaped sensing zone with a depth of 20% of the fiber diameter. The D-type sensing area is then rinsed with deionized water to remove impurities;

[0054] (2) growth graphene: the copper foil after polishing is put into tube furnace, by passing into the mixed gas of the hydrogen of 50sccm and 50sccm methane in tube furnace, keep 30min under 1000 °, graphene layer number is monolayer, then cut the graphene / copper foil into small rectangular stripes (1.2cm×0.5cm);

[0055] (3) Gold film is directly thermally evaporated onto graphene: put 6.5cm high-purity gold wire into molybdenum boat (length 100mm, w...

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Abstract

The invention belongs to the technical field of SPR sensors, in particular to a graphene / gold / D-type plastic optical fiber SPR sensor and a preparation method. The method includes the following steps: (1) opening a groove-shaped sensing area on the fiber to prepare a D-shaped fiber; (2) growing graphene on the copper foil by chemical vapor deposition, and using thermally evaporated Method directly vapor-deposit gold film on graphene to obtain gold / graphene / copper foil composite layer; (3) corrode the copper foil in gold / graphene / copper foil composite layer, and obtain Transfer to D-fiber, voilà. In the present invention, gold is directly vapor-deposited on the graphene by thermal evaporation, so that the graphene and the gold film are perfectly bonded, and then the graphene / gold that has corroded the copper foil is transferred to the D-shaped plastic optical fiber. The structure of gold plus graphene is realized on the optical fiber. The graphene / gold / D plastic optical fiber SPR sensor prepared by the invention has the characteristics of high recognition sensitivity to complementary and non-complementary DNA chains.

Description

technical field [0001] The invention belongs to the technical field of surface plasmon resonance (SPR) sensors, in particular to a graphene / gold / D-type plastic optical fiber SPR sensor and a preparation method. Background technique [0002] Since the fiber-optic SPR sensor was proposed in 1993, this technology has attracted increasing research interest. Optical fiber surface plasmon sensor, which can track and study the subtle changes on the surface of the medium, realizes ultra-sensitive and label-free chemical and biological analysis, and has important applications in food detection and disease diagnosis. [0003] So far, research scholars have made many efforts to improve the performance of fiber optic SPR sensors. For example, various optical fiber structures have been proposed: tapered, D-shaped, U-shaped, etc. The cylindrical fiber geometry is not suitable for the transfer of large-area material layer films. Meanwhile, the film is not easy to stabilize on the cylind...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/552G01N21/01
CPCG01N21/01G01N21/554G01N21/553
Inventor 张超姜守振徐纪华修显武
Owner SHANDONG NORMAL UNIV
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