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A ppy/cds/pb/au nano-electrode, preparation method and application thereof

A nano-electrode and electrode technology, applied in the field of nano-electrode preparation, can solve stability problems, high cost and scarcity limit development, temperature and environmental sensitivity, and achieve low detection limit, enhanced electrochemical response, and wide linear range. Effect

Active Publication Date: 2020-06-02
ANHUI NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, they are sensitive to pH, temperature and environment, often presenting stability issues
Noble metal composites are widely used to detect hydrazine due to their good electrical conductivity and high sensitivity, while the high cost and scarcity of noble metals limit their development.

Method used

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  • A ppy/cds/pb/au nano-electrode, preparation method and application thereof
  • A ppy/cds/pb/au nano-electrode, preparation method and application thereof
  • A ppy/cds/pb/au nano-electrode, preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] A kind of preparation method of PPy / CDs / PB / Au nanometer electrode, comprises the following steps:

[0047] 1) Put a gold wire with a diameter of 25 μm and a length of 3-4 cm into a 7.5 cm long aluminosilicate capillary, the specification of the aluminosilicate capillary is o.d.=1.0mm; i.d.=0.64mm;

[0048] 2) Seal one end of the capillary with epoxy resin, the purpose of which is to be in a vacuum environment during the drawing process, and then draw two sections with ultra-fine tips on the laser drawing instrument, and the drawn two sections of glass tips The gold wire in the glass should be well fused with the glass and the gold wire should change continuously and evenly. Draw with P-2000 laser drawing machine, the parameters are set as: heating temperature 450-500 ℃, pulling force 120-150N, speed 225-275m / s, heating four cycles, each cycle heating 15-20s, cooling 40- 45s, always keep the vacuum state.

[0049] 3) Use silver conductive glue to connect a tungsten wir...

Embodiment 2

[0057] A kind of PPy / CDs / PB / Au nano electrode detects the application of hydrazine, specifically:

[0058] The PPy / CDs / PB / Au nanoelectrode prepared in Example 1 was placed in 5mL of 0.5M KCl aqueous solution, and the potential was set to 0.3V by chronoamperometry, and a certain amount of hydrazine was added in sequence (after each addition of hydrazine, wait for After the current signal is stable, hydrazine can be added again), so that the final concentration of hydrazine after each addition is 0.5 μM, 1.0 μM, 1.5 μM, 2.0 μM, 4.0 μM, 6.0 μM, 8.0 μM, 12 μM, 16 μM, 20 μM, 30μM, 40μM, 50μM, 60μM, 80μM, it was found that with the increase of the concentration of hydrazine added, the response current value gradually increased, which indicated that the electrode had the ability to detect hydrazine. Test the chronocurrent response curve to construct a linear relationship.

[0059] Figure 5A is the amperometric response curve of the electrode PPy / CDs / PB / Au in 5 mL of 0.5M KCl aqueo...

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Abstract

The invention provides a PPy / CDs / PB / Au nanoelectrode, and a preparation method and application thereof. Compared with the prior art, on the basis of a hexa-cyano-ferrite complex, namely Prussian blue(PB), the PB is low in cost, good in stability and excellent in electrochemical response, and thus the PB has the great advantage in the aspect of hydrazine sensors. The nanoelectrode is modified through the PB and covered with polypyrrole and a carbon dot hybrid film, owing to good electrical conductivity, large specific surface area and excellent electrochemical activity of carbon dots, electrochemical response is greatly enhanced through the polypyrrole and the carbon dot hybrid film, and the stability of the sensors is improved greatly; and owing to advantages of the nanoelectrode, the obvious advantages that compared with other methods, detecting limitation of the sensors on hydrazine is lower, and the linearity range is wider are achieved.

Description

technical field [0001] The invention belongs to the field of nano-electrode preparation, and in particular relates to a PPy / CDs / PB / Au nano-electrode, a preparation method and an application thereof. Background technique [0002] Hydrazine (N 2 h 4 ), also known as hydrazine, is an important fine chemical raw material, which is widely used in medicine, chemical industry, military, aerospace and other fields. But at the same time, hydrazine is also considered as a carcinogen and neurotoxin, causing great harm to human health. Improper discharge of hydrazine has caused serious pollution to the environment. Therefore, the real-time monitoring of hydrazine concentration is also a top priority. The development of new electrode materials for electrochemical hydrazine monitoring and the study of the electrochemical behavior of hydrazine have important theoretical significance and practical value for the effective monitoring of environmental pollutant hydrazine. [0003] Current...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/30G01N27/48B81C1/00
CPCB81C1/00111G01N27/30G01N27/48
Inventor 李永新陈唯
Owner ANHUI NORMAL UNIV
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