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A kind of electrode slurry and its direct electrochemical detection method on sample surface

An electrochemical and sample technology, applied in the field of electrochemical sensing, can solve cumbersome and time-consuming problems, and achieve the effect of simple preparation process, easy operation and compact contact

Inactive Publication Date: 2017-03-29
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This process is also very cumbersome and time-consuming

Method used

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  • A kind of electrode slurry and its direct electrochemical detection method on sample surface
  • A kind of electrode slurry and its direct electrochemical detection method on sample surface
  • A kind of electrode slurry and its direct electrochemical detection method on sample surface

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043]Prepare 0.5% chitosan solution, weigh 0.4g carbon powder, and mix evenly with 0.4mL chitosan solution to prepare carbon slurry. Apply the carbon paste to the PVC substrate. After it is dried at room temperature, it can be tested on the machine, and the drying is usually completed within 8 minutes. Using cyclic voltammetry, in [Fe(CN) 6 ] 3- / 4- The solution was scanned by cyclic voltammetry, and the results shown in Figure 1 were obtained.

[0044] Figure 1 is a scanning electron microscope of the carbon paste electrode structure, from Figure 1A It can be seen that in the absence of chitosan, the tiny carbon sheet particles present a loosely arranged structure and are easy to fall off. Figure 1B It is the morphology of the carbon paste electrode obtained after adding chitosan. It is a sheet-like carbon powder that is closely packed together to form a uniform film structure, and there are holes distributed in the film.

[0045] figure 2 For carbon paste electrode i...

Embodiment 2

[0048] Prepare 1% chitosan solution, weigh 0.4g carbon powder, and mix with 0.4mL chitosan solution evenly to prepare carbon slurry.

Embodiment 3

[0050] Configure 2% chitosan solution, the same as implementation example 2.

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Abstract

The invention discloses electrode paste and a method for performing direct electrochemical detection on the specimen surface with the electrode paste. The method includes: (1) uniformly mixing a chitosan solution with carbon dust and silver powder to obtain carbon paste and silver paste; (2) respectively smearing the surface of a to-be-tested specimen with the obtained carbon paste and silver paste prior to drying to obtain a carbon paste electrode and silver paste electrodes respectively; (3) performing electrochemical detection on the to-be-tested specimen by taking the carbon paste electrode as a working electrode and the silver paste electrodes as a counter electrode and a reference electrode. One kind of porous electrode paste is prepared by taking the carbon dust, silver powder or other powdery materials and chitosan as raw materials under mild conditions, and the surface of the specimen is directly smeared with the electrodes so as to realize direct detection. The method has the advantages of mild electrode preparation conditions, simplicity in operation and no need of specimen pretreatment.

Description

technical field [0001] The invention relates to electrochemical sensing technology, in particular to a method in which electrodes are directly prepared on a sample and the sample can be detected without pretreatment. Background technique [0002] Electrochemical technology is a kind of excellent detection method, which has the characteristics of simple operation and high sensitivity. It has great application potential in the field of analysis. However, some shortcomings of electrochemistry itself hinder its application in daily analysis. For example, in electrochemical detection, the requirements on electrodes are very high, and the electrodes must be kept clean to avoid interference from impurities. Therefore, before each measurement, the electrodes need to be processed in a complicated way, firstly after being polished, and then ultrasonically cleaned in pure water, ethanol and other solvents in turn before they can be used. The time required for electrochemical detecti...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01B1/04G01N27/48
Inventor 唐文志吴坚
Owner ZHEJIANG UNIV
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