PH electrochemical sensor based on aniline oligomer/graphene composite material, and preparation method of sensor

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

Active Publication Date: 2019-05-14
NINGBO INST OF TECH ZHEJIANG UNIV ZHEJIANG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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 material, and preparation method of sensor
  • PH electrochemical sensor based on aniline oligomer/graphene composite material, and preparation method of sensor
  • PH electrochemical sensor based on aniline oligomer/graphene composite material, and preparation method of sensor

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 an aniline oligomer / graphene composite material. The sensor comprises a pH sensing electrode; the surface of the pH sensing electrode is modified by the aniline oligomer / graphene composite material; and the composite material is formed by coating the surface of the electrode with a composite material dispersion solution and then carryingout drying. The composite material modified electrode is simple in preparation process, small in size, low in production cost and convenient to detect, and does not need special treatment before and after being used; and the obtained pH electrochemical sensor can be used as a pH sensor to dynamically detect the change of the pH value, and can be applied to dynamic process detection of biological or chemical reactions. Graphene is introduced into aniline oligomer to obviously improve the pH sensitivity of the electrode; and meanwhile, compared with a pure aniline oligomer modified electrode, the detection sensitivity of the composite material modified electrode is improved by nearly three times from 2.60 [mu]A.pH-1.cm<-2> to 8.06 [mu]A.pH-1.cm<-2>, and 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 Applications(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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