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Preparation method of electrochemical sensor based on magnetic nanocomposite

A technology of nanocomposite materials and composite materials, which is applied in the field of preparation of electrochemical sensors, can solve the problems of easy aggregation and instability of spinel ferromagnetic particles, and achieve the effects of improving electron transfer speed, convenient qualitative and good stability

Active Publication Date: 2018-04-06
SHANGHAI SECOND POLYTECHNIC UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, unmodified spinel ferromagnetic particles are easy to agglomerate and extremely unstable, and its application is also facing great challenges

Method used

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  • Preparation method of electrochemical sensor based on magnetic nanocomposite
  • Preparation method of electrochemical sensor based on magnetic nanocomposite
  • Preparation method of electrochemical sensor based on magnetic nanocomposite

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Example 1 Fe 3 o 4 Preparation of / rGO nanocomposites

[0036] (1) Preparation of graphene oxide

[0037] Use the improved Hummers method to prepare graphene oxide, the specific method is as follows: First, weigh 0.75g of graphite powder and add it to a 250mL round bottom flask, then add 100mL of sulfuric acid / phosphoric acid mixed liquid (volume ratio: 9:1); After stirring evenly, slowly add 4.5g of potassium permanganate; subsequently, the mixture was heated and stirred at 50°C for 12h; Neutralize the unreacted potassium permanganate with hydrogen peroxide; let it settle for half a day, pour off the supernatant, and centrifuge to precipitate in a high-speed centrifuge; finally wash the precipitate with deionized water and 5% hydrogen peroxide until neutral.

[0038] (2) Add 0.2g of sodium hydroxide (NaOH) to 20mL of diethylene glycol (DEG), heat and stir at 120-150°C under nitrogen protection for 1-2h, then cool to 70°C to make NaOH / DEG stock liquid;

[0039] (3)...

Embodiment 2

[0042] Example 2 Pt / Fe 3 o 4 Preparation of / rGO New Nanocomposite Modified Electrode

[0043] (1) Pretreatment of glassy carbon electrodes

[0044] Clean the glassy carbon electrode with deionized water for 3-5 times, and polish the surface with alumina polishing powder. Ultrasonic cleaning is performed on the electrode surface. Then with freshly prepared 1 mol / L H 2 SO 4 As the bottom liquid, scan 15 cycles with cyclic voltammetry, the voltage range is -0.25V-1.25V, and the scanning speed is 0.05V / s. After the electrode is dried, it is washed with ultrapure water and dried for use.

[0045] (2) Fe 3 o 4 Preparation of / rGO nanocomposite modified electrode

[0046] Get the Fe prepared in 1 mg embodiment 1 3 o 4 / rGO nanocomposites were added to 1:1 ethanol aqueous solution and ultrasonically oscillated for 30-90 min to obtain evenly dispersed Fe 3 o 4 / rGO nanocomposite suspension. Then take 10-20 μL of the dispersion suspension and add it dropwise on the pretrea...

Embodiment 3

[0051] Example 3 MnFe 2 o 4 Preparation of / rGO nanocomposites

[0052] In the step (4) of embodiment 1, except soluble iron salt FeCl 3 In addition, add Mn-containing divalent ferromagnetic metal salts, including MnCl 2 , MnSO 4 , Mn(NO 3 ) 2 or Mn(CH 3 COO) 2 One of them, other steps and conditions are all the same as in Example 1, and the specific conditions are changed and adjusted accordingly within the scope of the content of the invention to obtain MnFe 2 o 4 / rGO nanocomposites.

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Abstract

The invention discloses a preparation method of an electrochemical sensor based on a magnetic nanocomposite. The method includes the steps that firstly, a one-step in-situ method is adopted to synthesize a ferromagnetic / graphene nanocomposite, the composite is modified to the electrode surface, then an electrochemical deposition method is utilized to deposit precious metal to the surface of the composite, and the novel electrochemical sensor which is based on the magnetic nanocomposite and has good catalytic performance is formed. The electrochemical sensor based on the magnetic nanocomposite can be used for detecting hydrogen peroxide, and the preparation method has the advantages of being high in response speed, high in sensitivity, good in stability, good in selectivity, wide in detection line and the like.

Description

technical field [0001] The invention relates to the technical field of sensors, in particular to a method for preparing an electrochemical sensor based on a magnetic nanocomposite material. Background technique [0002] hydrogen peroxide (H 2 o 2 ) has strong oxidizing properties, and is widely used in food hygiene, environmental protection, textile, chemical and other fields as an efficient disinfectant and bleaching agent, but H 2 o 2 Excessive residues will cause serious harm to human health and the ecological environment, such as oxidizing human cells to accelerate aging, causing human genetic material to mutate or gene mutation; promoting the formation of acid rain and seriously destroying vegetation; causing fish and shrimp deaths and causing serious damage to the aquaculture industry. serious loss etc. Therefore for H 2 o 2 It is particularly important to perform accurate, rapid and sensitive detection. [0003] Currently, the determination of H 2 o 2 The mos...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/30G01N27/48B82Y30/00B82Y40/00C01G49/06C01B32/184
CPCB82Y30/00B82Y40/00C01G49/06C01P2002/72C01P2004/03C01P2004/64G01N27/308G01N27/48
Inventor 赵雪伶朱志刚
Owner SHANGHAI SECOND POLYTECHNIC UNIVERSITY
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