pH electrochemical sensor based on aniline oligomer/graphene composite and its preparation method

An aniline oligomer and composite material technology, applied in the direction of material electrochemical variables, etc., can solve the problems of complex preparation of polyaniline, difficult application and promotion, and high processing difficulty, achieving excellent solubility and processing performance, improving pH response sensitivity, The effect of improved detection sensitivity

Active Publication Date: 2021-11-02
NINGBO INST OF TECH ZHEJIANG UNIV ZHEJIANG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the preparation of polyaniline is complicated and the processing is difficult, resulting in high cost and difficult application and promotion.

Method used

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  • pH electrochemical sensor based on aniline oligomer/graphene composite and its preparation method
  • pH electrochemical sensor based on aniline oligomer/graphene composite and its preparation method
  • pH electrochemical sensor based on aniline oligomer/graphene composite and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Step 1, 20 mg of aniline tetramer is dissolved in 20 mL of ethanol, and magnetic stirring is used to prepare aniline tetramer solution;

[0031] Step 2, adding 20mL concentration of graphene dispersion of 1mg / mL to the aniline tetramer solution prepared in step 1, magnetically stirring for 12 hours after ultrasonication for 20min, and fully mixing to obtain a composite material dispersion;

[0032] Step 3. Take 10 μL of the composite material dispersion prepared in Step 2 and drop it on the polished and cleaned ITO conductive glass surface, and dry it naturally in a fume hood.

Embodiment 2

[0034] Step 1, 0.2 mg of aniline tetramer was dissolved in 20 mL of ethanol, and magnetic stirring was used to prepare aniline tetramer solution;

[0035] Step 2, adding 20mL concentration of graphene dispersion of 1mg / mL to the aniline tetramer solution prepared in step 1, magnetically stirring for 12 hours after ultrasonication for 20min, and fully mixing to obtain a composite material dispersion;

[0036] Step 3. Take 10 μL of the composite material dispersion prepared in Step 2 and drop it on the polished and cleaned ITO conductive glass surface, and dry it naturally in a fume hood.

Embodiment 3

[0038] Step 1, dissolving 200mg of aniline tetramer in 20mL of ethanol, and using magnetic stirring to obtain aniline tetramer solution;

[0039] Step 2, adding 20mL concentration of graphene dispersion of 1mg / mL to the aniline tetramer solution prepared in step 1, magnetically stirring for 12 hours after ultrasonication for 20min, and fully mixing to obtain a composite material dispersion;

[0040] Step 3. Take 10 μL of the composite material dispersion prepared in Step 2 and drop it on the polished and cleaned ITO conductive glass surface, and dry it naturally in a fume hood.

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Abstract

The invention provides a pH electrochemical sensor based on aniline oligomer / graphene composite material, comprising a pH sensing electrode, the surface of which is modified by aniline oligomer / graphene composite material, and the composite material is coated with a composite material dispersion It is formed after drying on the electrode surface. The preparation process of the composite material modified electrode of the present invention is simple, small in size, low in production cost, convenient in detection, and does not require special treatment before and after use. Dynamic process detection of reactions. The introduction of graphene into the aniline oligomer significantly improved the pH sensitivity of the electrode. Compared with the pure aniline oligomer modified electrode, the detection sensitivity of the composite modified electrode was increased by nearly three times, from 2.60μA·pH ‑1 cm ‑2 Increased to 8.06μA·pH ‑1 cm ‑2 , the detection range is expanded from pH 1-9 to pH 1-13.

Description

technical field [0001] The invention relates to the field of electrochemical sensors, in particular to a pH electrochemical sensor based on aniline oligomer / graphene composite material, and to a preparation method thereof. Background technique [0002] The measurement and control of pH value is of great significance in the fields of water quality monitoring, biological fermentation, clinical medical diagnosis, etc. Currently, the practically applied pH sensors are mainly concentrated in glass sensors and metal oxide sensors, which are easily damaged, toxic, Disadvantages such as many interference factors and narrow pH measurement range. Electrochemical sensors can use pH stimulus-responsive materials to modify the working electrode, so as to achieve the characteristics of high sensitivity, high selectivity, and high stability, which is one of the development directions of pH sensors. [0003] Polyaniline, a conductive polymer material, is widely used as a modified electroch...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/30
Inventor 邓萌廖鹏威周子博陈飞
Owner NINGBO INST OF TECH ZHEJIANG UNIV ZHEJIANG
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