Graphene/polyaniline composite membrane based pH detecting electrode

A technology for detecting electrodes and polyaniline, which is applied in the direction of material electrochemical variables, etc., can solve the problems of unreported graphene/polyaniline composite films, etc., and achieve the effects of improved detection effect, convenient detection, and low price

CN104914150AInactive Publication Date: 2015-09-16SHANGHAI JIAO TONG UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2015-09-16
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses a graphene / polyaniline composite membrane based pH detecting electrode. The graphene / polyaniline composite membrane based pH detecting electrode comprises an electrode body and a graphene / polyaniline composite membrane covering the outer surface of the electrode body, wherein the electrode body is selected from one of an ITO glass electrode, a stainless steel gold plated electrode and a gold disc electrode. The invention also discloses a preparation method of the pH detecting electrode. The preparation method comprises the following steps: (1) pretreating the electrode; (2) preparing electrolyte; and (3) carrying out electrochemical polymerization. The invention also discloses an application method of the pH detecting electrode. The pH detecting electrode is used for detecting the pH of a phosphate buffer solution, oxidation peak potential acts as a detecting signal, and the pH value within the range of 1-11 can be detected. Compared with a common pH detecting electrode, the graphene / polyaniline composite membrane based pH detecting electrode is smaller in size, is lower in price, is more convenient in detection, and does not require special treatment before and after use. The compounding of graphene and polyaniline obviously improves the pH detecting effect of the electrode.
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Description

technical field

[0001] The invention relates to a pH detection electrode, in particular to a pH detection electrode based on a graphene / polyaniline composite film. Background technique

[0002] pH measurement is closely related to fields such as medicine, bioengineering, modern industry, agriculture, environment and scientific research. At present, the two most widely used pH sensors are mainly glass electrodes and metal oxide electrodes. Among them, the measurement of pH by glass electrodes is relatively accurate (except for the measurement error in the case of high acidity and high alkalinity), but the glass electrode is due to the volume It is difficult to realize the analysis of living micro-area or micro-environment, and the electrode has high internal resistance and is easy to be damaged. Whereas pH sensors based on metal oxides such as IrO 2 , WO 3 or Ni(OH) 2 , although easy to miniaturize, these metal oxides are toxic, so they cannot be used for biological or me...

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Embodiment Construction

[0023] The embodiments of the present invention are described in detail below in conjunction with the accompanying drawings: this embodiment is implemented on the premise of the technical solution of the present invention, and detailed implementation methods and specific operating procedures are provided, but the protection scope of the present invention is not limited to the following the described embodiment.

[0024] With the development of life sciences, there are more and more requirements for the determination of the pH value of the living body, so it is difficult to use the traditional glass electrode, and the conductive polymer sensitive to pH has good biocompatibility and is easy to process. , low cost and other advantages provide a beneficial way for the miniaturization and low cost of pH sensors. The present invention first uses electrochemical cyclic voltammetry to prepare graphene / polyaniline composite film on the surface of common glass electrode ITO, and it is u...