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Preparation method for a porous graphene microelectrode and applications

A graphene and micro-electrode technology, applied in the field of biosensing, can solve the problems of many steps and complicated operation, and achieve the effects of good stability, high catalytic performance, and favorable commercial scale production

Inactive Publication Date: 2016-02-24
BEIJING INSTITUTE OF TECHNOLOGYGY
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Problems solved by technology

The commonly used enzyme immobilization methods include adsorption method, covalent bonding method, cross-linking method, and embedding method, all of which involve various modifications on traditional conventional electrodes, with many steps and complicated operations

Method used

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  • Preparation method for a porous graphene microelectrode and applications
  • Preparation method for a porous graphene microelectrode and applications
  • Preparation method for a porous graphene microelectrode and applications

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Embodiment 1

[0033] The preparation process and steps in this embodiment are as follows:

[0034] A. Preparation of Graphene Oxide (GO): Graphene oxide was prepared by oxidizing natural graphite powder using a modified Hummers method.

[0035] B. Pretreatment of Pt wire: Firstly, the Pt wire (100 μm in diameter) is polished and polished with metallographic sandpaper to increase the surface roughness, which is beneficial to the deposition of graphene. Then use nitric acid, absolute ethanol, and ultrapure water to ultrasonically clean for 3 minutes, and set aside;

[0036] C. Preparation of porous graphene microelectrodes: containing 0.1M LiClO 4 The aqueous solution of 3mg / mL graphene oxide was used as the electrolyte, the platinum wire with a fixed length of 1.5cm was used as the working electrode, the platinum electrode was used as the counter electrode, and the saturated calomel electrode was used as the reference electrode. . Then the deposited microelectrodes were immersed in ultrap...

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Abstract

The invention discloses a preparation method for a porous graphene microelectrode and applications. The provided method is a one-step electrodeposition method, namely, oxidized graphene is subjected to electrochemical reduction into graphene, and the graphene is assembled on Pt wires at the same time. The employed Pt has a high conductivity, and the graphene has excellent conductivity and good biocompatibility. Thus the obtained graphene microelectrode has a porous structure, the internal cavity and pores are interlaced mutually and a three-dimensional structure is formed. Because the graphene microelectrode has a porous structure, after the glucose oxidase is fixed, direct electrochemistry of the enzyme can be achieved and the porous graphene microelectrode can be used for rapid electrochemical measurement of glucose directly. The sensor has good stability and a long service life.

Description

technical field [0001] The invention relates to a preparation method and application of a graphene microelectrode, belonging to the field of biosensing. Background technique [0002] Microelectrode technology has risen in various fields in recent years and has been paid much attention by researchers. Microelectrodes play an important role in nanotechnology. They can detect single molecules and single nanoparticles, and can also measure trace metal ions. Therefore, microelectrode technology has become a branch with broad development prospects in the field of electrochemical research. . Compared with conventional electrodes, microelectrodes have the following advantages: higher current density, shorter response time, faster mass transfer, lower polarization current, and higher signal-to-noise ratio, and the prepared electrode has a stable and high-density current, Not easily affected by external factors. In addition, it has a small size and minimal damage to the measured ob...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/327
Inventor 邵会波李璇石玉杰
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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