Graphene/SDS (Sodium Dodecyl Sulfate)-modified carbon paste electrode and preparation method thereof

A carbon paste electrode and graphene technology, applied in the field of electrochemical analysis, can solve the problems of poor electrode stability and reproducibility, and achieve good selectivity and sensitivity, good reproducibility, and low preparation cost

Active Publication Date: 2015-04-01
SHANGHAI APPLIED TECHNOLOGIES COLLEGE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] One of the purposes of the present invention is to provide a carbon paste electrode modified by graphene / SDS in order to solve the technical problems such as the above-mentioned electrode stability and poor reproducibility, the carbon paste electrode has high sensitivity, high stability and good reproducibility

Method used

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  • Graphene/SDS (Sodium Dodecyl Sulfate)-modified carbon paste electrode and preparation method thereof
  • Graphene/SDS (Sodium Dodecyl Sulfate)-modified carbon paste electrode and preparation method thereof
  • Graphene/SDS (Sodium Dodecyl Sulfate)-modified carbon paste electrode and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0050] A carbon paste electrode modified by graphene / SDS, the schematic diagram of which is shown in figure 1 As shown, the carbon paste electrode modified by graphene / SDS is composed of an electrode lead 1, a polytetrafluoroethylene tube 2 with an inner diameter of 3 mm, and a carbon paste 3 filled in the polytetrafluoroethylene tube 2. The electrode One end of the lead wire 1 is directly inserted into the carbon paste 3, and the other end is led out of the polytetrafluoroethylene tube 2;

[0051] The electrode lead 1 is a copper rod;

[0052] The inner diameter of the polytetrafluoroethylene pipe 2 is 3mm;

[0053] The carbon paste 3 is formed by uniformly grinding graphite powder, solid paraffin oil and graphene / SDS composite material, wherein the amount of graphite powder, solid paraffin oil and graphene / SDS composite material is calculated by mass ratio, i.e. graphite Powder: solid paraffin oil: graphene / SDS composite material is 4:1.33:1;

[0054] In the described gra...

Embodiment 1

[0063] As a contrast, a carbon paste electrode for comparison was prepared, that is, there was no common bare carbon paste electrode modified by graphene / SDS, and its preparation process was the same as that of the carbon paste electrode modified by graphene / SDS in the above-mentioned embodiment 1. It's just that carbon paste 3 is made by uniformly mixing 240mg graphite powder and 80mg solid paraffin oil.

[0064] The carbon paste electrode modified by the graphene / SDS obtained in Example 1 was placed in PBS solution (phosphate buffer solution) of 0.1M and pH=7.0 for cyclic voltammetry scanning, and the scanning rate was 50mV / s, and the resulting cyclic voltammetry safety curve as figure 2 shown, from figure 2 It can be seen that the graphene / SDS modified carbon paste electrode has a wider electrochemical window and a lower background current, and with repeated scanning, the response current and potential have no obvious changes, which shows that the The invented graphene / ...

Embodiment 2

[0070] A carbon paste electrode modified by graphene / SDS is composed of an electrode lead, a polytetrafluoroethylene tube with an inner diameter of 3mm, and a carbon paste filled in the polytetrafluoroethylene tube. One end of the electrode lead is inserted directly into the carbon paste , and the other end leads out of the Teflon tube;

[0071] The electrode leads are copper rods;

[0072] The inner diameter of the polytetrafluoroethylene pipe is 3mm;

[0073] The carbon paste is uniformly mixed by grinding graphite powder, solid paraffin oil and graphene / SDS composite material, wherein the amount of graphite powder, solid paraffin oil and graphene / SDS composite material is calculated by mass ratio, i.e. graphite powder : Solid paraffin oil: graphene / SDS composite material is 3:1.07:1;

[0074] In the described graphene / SDS composite material, calculated by mass ratio, graphene: SDS is 1:0.3.

[0075] The preparation method of the above-mentioned carbon paste electrode mod...

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Abstract

The invention discloses a graphene / SDS (Sodium Dodecyl Sulfate)-modified carbon paste electrode and a preparation method thereof. The graphene / SDS-modified carbon paste electrode consists of an electrode lead, a polytetrafluoroethylene tube or a quartz glass tube with inner diameter of 3mm, and a carbon paste filled into the polytetrafluoroethylene tube or the quartz glass tube, wherein one end of the electrode lead wire is straightly inserted into the carbon paste, the other end of the electrode lead is leaded to the outside of the polytetrafluoroethylene tube or the quartz glass tube, and the carbon paste is formed by uniformly grinding and mixing graphite powder, solid paraffin oil and a graphene / SDS composite material; the mass ratio of graphene / SDS in the graphene / SDS composite material is 1:(0.3-0.4). The preparation method comprises the preparation of the graphene / SDS composite material, assembling of the graphene / SDS-modified carbon paste electrode and the like. The graphene / SDS-modified carbon paste electrode has favorable electrochemical activity, reproducibility and stability, is easy in activization and regeneration, and is applied to dopamine detection.

Description

technical field [0001] The invention relates to a graphene / SDS modified carbon paste electrode and a preparation method thereof, belonging to the field of electrochemical analysis. Background technique [0002] Dopamine (hereinafter referred to as DA) is an important catecholamine neurotransmitter and an adrenaline-mimetic drug, which is widely distributed in mammals and plays a very important role in the central nervous system, kidney, cardiovascular system and endocrine system. In addition, abnormal DA content can lead to many diseases, such as Alzheimer's disease, Parkinson's disease, senile dementia, schizophrenia and HIV infection, etc. Therefore, it is important to establish a simple, fast and accurate DA detection method very important. [0003] There are many traditional methods for detecting DA, such as capillary electrophoresis, fluorimetry, chromatographic analysis, spectrophotometry and chemiluminescence, etc., but these methods generally require high experiment...

Claims

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Application Information

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IPC IPC(8): G01N27/30G01N27/327
Inventor 韩生叶冯英蒋继波武慧慧祝俊
Owner SHANGHAI APPLIED TECHNOLOGIES COLLEGE
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