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Electrode material based on graphene oxide/graphite fiber composite structure and its preparation and application method

A graphite fiber and composite structure technology, applied in the direction of material electrochemical variables, can solve the problems that the sensitivity is difficult to achieve a large breakthrough, graphene oxide is easy to agglomerate, and the basic electrode area is small, which is beneficial to fixation and detection sensitivity and stability Improved performance, simple method, and wide application range

Active Publication Date: 2017-04-19
BEIJING INST OF NANOENERGY & NANOSYST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the small area of ​​the basic electrode, it is difficult to achieve a major breakthrough in improving the sensitivity
In addition, graphene oxide is easy to agglomerate in a complex system, resulting in short life and poor reliability of the sensor.

Method used

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  • Electrode material based on graphene oxide/graphite fiber composite structure and its preparation and application method
  • Electrode material based on graphene oxide/graphite fiber composite structure and its preparation and application method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Embodiment 1: Preparation of electrochemical DNA sensor

[0029] 1) Oxidation of commercial graphite fibers: Mix 100ml of concentrated sulfuric acid, 10ml of concentrated nitric acid, and 4g of potassium permanganate as an oxidation solution. Put the fiber directly into the above oxidation solution, oxidize at 65°C for 12 hours. The fibers were removed and rinsed copiously with deionized water.

[0030] 2) The oxidized fiber was characterized by electron microscopy, infrared spectroscopy and X-ray photoelectron spectroscopy, and it was confirmed that a large number of ordered graphene oxide (abbreviated as GO, the same below) sheets were formed on the surface.

[0031] 3) Cut out a piece of oxidized fiber, stick it on the conductive glass with silver glue, and connect a piece of copper wire in front as the electrode wire. Leave a fiber with a length of 1.5 cm for subsequent testing, and the other parts are sealed by epoxy resin and polytetrafluoroethylene tape. Used ...

Embodiment 2

[0033] Embodiment 2: Preparation of electrochemical enzyme sensor

[0034] 1) Oxidize the commercial graphite fiber: 90ml of concentrated sulfuric acid, 10ml of concentrated phosphoric acid, 4.5g of potassium permanganate and mix well as the oxidation solution. Put the fiber directly into the above oxidation solution, and oxidize for 20 hours at 70°C. The fibers were removed and rinsed copiously with deionized water.

[0035] 2) The oxidized fiber was characterized by electron microscopy, infrared spectroscopy and X-ray photoelectron spectroscopy, and it was confirmed that a large number of ordered GO sheets were formed on the surface.

[0036] 3) Cut out a piece of oxidized fiber, stick it on the conductive glass with silver glue, and connect a piece of copper wire in front as the electrode wire. Leave the fiber with a length of 1 cm for subsequent detection, and the other parts are sealed by epoxy resin and polytetrafluoroethylene tape. Used as the working electrode of th...

Embodiment 3

[0038] Example 3: Preparation of electrochemical immunosensor

[0039] 1) Oxidize the commercial graphite fiber: 90ml of concentrated sulfuric acid, 10ml of concentrated phosphoric acid, 4.5g of potassium permanganate and mix well as the oxidation solution. Put the fiber directly into the above oxidation solution, oxidize for 24 hours at 80°C. The fibers were removed and rinsed copiously with deionized water.

[0040] 2) The oxidized fiber was characterized by electron microscopy, infrared spectroscopy and X-ray photoelectron spectroscopy, and it was confirmed that a large number of ordered GO sheets were formed on the surface.

[0041] 3) Cut out a piece of oxidized fiber, stick it on the conductive glass with silver glue, and connect a piece of copper wire in front as the electrode wire. The fiber with a length of 0.5 cm was left for subsequent detection, and the other parts were sealed by epoxy resin and polytetrafluoroethylene tape. Used as the working electrode of the ...

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Abstract

The invention discloses a graphene oxide / graphite fiber composite structure based electrode material, a preparation method thereof and application in electrochemical biosensors. The method of oxidizing graphite fiber by a concentrated acid is employed for the first time to prepare the graphene oxide / graphite fiber composite structure material, and a lot of ordered graphene oxide slice layers can be formed directly on a graphite fiber surface. The lamellar graphene oxide is generated by direct stripping from the graphite fiber surface, can be conducive to increasing the surface area of the electrode, and is ordered, agglomeration cannot occur, a complex preparation and assembling process can be avoided, and the electrode stability and detection reliability are significantly improved. The micro-nano electrode provided by the invention has the characteristics of high sensitivity, good stability and simple preparation method, and has very good application prospects in the aspect of electrochemical biosensor detection.

Description

technical field [0001] The invention relates to an electrode material, in particular to a preparation and application method of an electrode material based on a graphene oxide / graphite fiber composite structure. Background technique [0002] Biosensors play an important role in clinical diagnosis, medicine, disease control, bioengineering, and environmental protection. Among them, the electrochemical method has gained more and more favor due to its advantages of simplicity, cheapness and high sensitivity. Various methods of constructing electrochemical biosensors have also been developed, such as electrochemical biosensors based on various nanoparticles, DNA intercalators, and enzymatic analysis. Various electrochemical detection methods have also been applied in electrochemical biosensors, including square wave voltammetry, differential pulse voltammetry, cyclic voltammetry, electrochemical impedance, etc. In electrochemical biosensors, the electrode is a very critical co...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/30
Inventor 李爱学张健牟晓宁赵振环于欣郭伟博李建华刘宏
Owner BEIJING INST OF NANOENERGY & NANOSYST