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Graphene sensitivity enhancing ITO metamaterial U-shaped SPR (Surface Plasmon Resonance) sensor

A technology of graphene and metamaterials, applied in the analysis of materials, material analysis through optical means, instruments, etc., can solve the problems of easy oxidation of optical fiber SPR sensors, inability to realize light field regulation, poor biological affinity, etc., and achieve improved sensitivity , Improved detection ability, strong anti-oxidation effect

Inactive Publication Date: 2019-11-22
SHANDONG NORMAL UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] In order to overcome the shortcomings of traditional optical fiber SPR sensors, such as easy oxidation, low sensitivity, low detection limit, poor bio-affinity, and inability to realize light field regulation, the present invention proposes a graphene-sensitized ITO metamaterial U-shaped SPR sensor. SPR sensor has the advantages of high sensitivity, stable performance, controllable light field, low detection limit, etc. It has broad application prospects in chemical, biological, medical, food industry and other fields

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  • Graphene sensitivity enhancing ITO metamaterial U-shaped SPR (Surface Plasmon Resonance) sensor
  • Graphene sensitivity enhancing ITO metamaterial U-shaped SPR (Surface Plasmon Resonance) sensor

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Embodiment 1

[0048] A graphene-sensitized ITO metamaterial U-shaped SPR sensor, such as Figure 1~2 As shown, it includes a U-shaped optical fiber 1. The U-shaped optical fiber is a multimode optical fiber containing a U-shaped area. The core 2 of the U-shaped section is exposed on the plane of the U-shaped section. The surface of the U-shaped area is sequentially arranged from top to bottom. Uniform ITO nanorods 3, gold particles 4 and graphene layers 5 on top of ITO nanorods.

[0049] The radius of curvature of the U-shaped area is 0.6mm. The U-shaped segment is located in the middle of the U-shaped optical fiber 1 . The thickness of the graphene layer is 2.8nm; the size of the gold particle is 14nm; the length of the ITO nanorod is 400-500nm, and the gap is 9-10nm.

[0050] The preparation method of the sensor is as follows: put the two ends of the ordinary multimode optical fiber segment into a plastic tube with a diameter of 0.5 cm, control one side of the U-shaped bending area to 1...

Embodiment 2

[0054] 1. Test material

[0055] Probe DNA, complementary target DNA (tDNA) and mismatched DNA (misDNA) were purchased from Sangon Biotechnology Company (Shanghai, China).

[0056] Probe DNA sequence: 5'-cttctgtcttgatgtttgtcaaac-3' (SEQ ID NO.1);

[0057] Complementary target DNA sequence: 5'-gtttgacaaacatcaagacagaag-3' (SEQ ID NO.2);

[0058] mis_DNA: 5'-caacattccgttaaccattcccca-3' (SEQ ID NO. 3).

[0059] Phosphate buffered saline (PBS, P5368-10PAK) with a pH value of 7.4 was purchased from Sigma-Aldrich, Shanghai, China.

[0060] 1-Pyridinebutyric acid succinyl ester (PBASE) and dimethyl sulfoxide (DMSO) were obtained from Sigma-Aldrich, Shanghai, China.

[0061] 2. Test process

[0062] 1) Dissolve freeze-dried probe DNA, misDNA and tDNA in PBS buffer solution respectively, and prepare probe DNA solution and misDNA solution with a concentration of 1 μm; and the concentrations of tDNA solution are 0.01 μm, 0.1 μm, 1 μm and 10μm;

[0063] Dissolving PBASE in DMSO to ob...

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Abstract

The invention relates to a graphene sensitivity enhancing ITO metamaterial U-shaped SPR (Surface Plasmon Resonance) sensor, which comprises a U-shaped optical fiber, wherein the U-shaped area of the U-shaped optical fiber is provided with a Gr / Au@ITO nanorod hybrid material structure. The preparation method comprises the steps of (1) preparing a U-shaped optical fiber, and preparing a gold nanoparticle layer in the U-shaped area of the U-shaped optical fiber; (2) preparing an ITO nano array structure; and (3) loading a graphene layer. According to the invention, the U-shaped optical fiber is adopted to serve as a transmission medium of light, the Gr / Au@ITO nanorod hybrid material structure is prepared on the surface of the U-shaped optical fiber, the sensitivity of the SPR sensor is enhanced by the highly enhanced local electromagnetic field generated in nanometer gaps between the uniform nanorod structures, and the sensitivity is further enhanced by the carrier flow brought by the graphene layer. The sensor has the outstanding advantages of small volume, light weight, easy carrying, high sensitivity, stable property, strong and short biological affinity and the like, and has wideapplication prospect in the detection aspects of trace gases, liquid, chemical elements, DNA and the like in the fields of biology, chemical engineering, medicine and the like.

Description

technical field [0001] The invention belongs to the technical fields of material engineering, bioengineering and optical fiber optics, and in particular relates to a graphene-sensitized ITO metamaterial U-shaped SPR sensor. Background technique [0002] The information disclosed in this background section is only intended to increase the understanding of the general background of the present invention, and is not necessarily taken as an acknowledgment or any form of suggestion that the information constitutes the prior art already known to those skilled in the art. [0003] Surface Plasmon Resonance technology (SPR), which emerged in the 1990s, is a physical optical technology that uses the principle of SPR to detect the interaction between ligands and analytes on biosensing chips. The surface plasmon oscillation is the oscillation of the charge density quanta at the metal-dielectric intersection under the excitation of transverse magnetically polarized electromagnetic waves...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/552
CPCG01N21/554
Inventor 姜守振杨文李振孙倩倩杜学舰袭祥泰高金娟
Owner SHANDONG NORMAL UNIV
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