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pH sensor based on reduced graphene oxide (RGO) and pH value detection method using same

A detection method and technology of pH sensor, applied in the direction of electrochemical variables of materials, etc., can solve the problem of unsatisfactory response speed, and achieve the effect of improving response speed, simple reduction method, and avoiding chemical modification process.

Inactive Publication Date: 2013-10-23
SOUTHEAST UNIV
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Problems solved by technology

But the response speed is not ideal
Response time takes about half a minute

Method used

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  • pH sensor based on reduced graphene oxide (RGO) and pH value detection method using same
  • pH sensor based on reduced graphene oxide (RGO) and pH value detection method using same
  • pH sensor based on reduced graphene oxide (RGO) and pH value detection method using same

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Embodiment Construction

[0029] The embodiments of the present invention only take the reduced graphene oxide pH sensor with silver electrodes prepared by magnetron sputtering as an example, but are not limited to the specific content of the embodiments.

[0030] The present invention prepares the method for the reduced graphene oxide pH sensor of silver electrode to adopt following technical scheme:

[0031] The first step: use the natural graphite powder with potassium permanganate (KMnO 4 ), sodium nitrate (NaNO 3 ) and 98% concentrated sulfuric acid to oxidize graphite oxide, and then undergo ultrasonic treatment for 30 minutes to form graphene oxide flakes, and then let the graphene oxide flakes self-assemble through hydrogen bonding to form graphene oxide films (see figure 1 ).

[0032] Step 2: Put 1cm*1.5cm of SiO 2 The / Si silicon substrate was ultrasonically cleaned by acetone, absolute ethanol and deionized water for 20 min, then dried with nitrogen, covered with a mask, and deposited on ...

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Abstract

The invention discloses a pH sensor based on reduced graphene oxide (RGO) and a manufacturing method thereof, and a pH value detection method using the sensor. The manufacturing method of the sensor comprises the following steps: directly synthesizing a graphene oxide film from a graphene oxide (GO) sheet, coating a silver (Ag) or gold (Au) layer on a silicon dioxide (SiO2) / silicon (Si) substrate by vacuum coating to obtain electrodes, transferring the previously synthesized graphene oxide film between the electrodes, and naturally drying in air at room temperature; putting the prepared sample into a reaction kettle, evacuating air with nitrogen, and reducing by heat treatment; and making a trench along the edge of the reduced graphene oxide film with PMMA (polymethyl methacrylate) or any other insulating polymer to constitute a complete device for detecting the pH value variations.

Description

technical field [0001] The present invention relates to a pH sensor based on reduced graphene oxide, a manufacturing method thereof and a detection method using the sensor. The graphene oxide film is mainly formed by self-assembly of graphene oxide flakes, and has good electrical conductivity through heating and reduction. the sensing film. Background technique [0002] The dynamic analysis and research of the information transmission process in the living system often needs to understand the small pH changes in the living environment of living organisms and the real-time changes of its value with the living state of living organisms. Therefore, it is necessary to develop a simple technology with high sensitivity, fast and real-time, which can dynamically analyze and study the pH of the environment where the living body is located. [0003] At present, the methods of pH detection mainly include: indicator method, chemical analysis method and potential method. The indicator...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/26
Inventor 石增良吴靖徐春祥田正山朱刚毅
Owner SOUTHEAST UNIV
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