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Preparation method of heteropolytungstate/ carbon nano-tube/chitosan ternary composite film modified electrode

A technology of heteropolytungstate and carbon nanotubes is applied in the direction of material analysis, measurement device and instrument by electromagnetic means to achieve the effects of stabilizing electrical signals, improving sensitivity and stability, and reducing memory effect.

Inactive Publication Date: 2013-08-14
EAST CHINA UNIV OF TECH
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Problems solved by technology

However, there are few reports on the assembly of heteropolytungstates on the surface of CNTs

Method used

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  • Preparation method of heteropolytungstate/ carbon nano-tube/chitosan ternary composite film modified electrode
  • Preparation method of heteropolytungstate/ carbon nano-tube/chitosan ternary composite film modified electrode
  • Preparation method of heteropolytungstate/ carbon nano-tube/chitosan ternary composite film modified electrode

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Embodiment Construction

[0016] A preparation method of heteropolytungstate / carbon nanotube / chitosan ternary composite film modified electrode, the specific steps are as follows:

[0017] 1. Treatment of glassy carbon electrodes: use 1.0, 0.3 and 0.05 μm-Al 2 o 3 Polish with polishing powder, rinse with distilled water, then ultrasonically clean with 1:1 nitric acid, acetone and pure water, and dry in the air;

[0018] 2. Weigh 10 mg chitosan and dissolve in 10 ml, 0.1 mol / L acetic acid solution, take 5 mg acidified carbon nanotubes in 10 ml, 0.1 mol / L acetic acid solution, ultrasonically disperse for 15 minutes, and dissolve the above The two solutions were mixed and ultrasonicated for 30 minutes to obtain a carbon nanotube-chitosan suspension;

[0019] 3. Take 6 μl of the suspension and drop it on the surface of the glassy carbon electrode, and dry it at room temperature for 2 hours. In order to form a uniform carbon nanotube-chitosan composite film on the surface of the glassy carbon electrode, c...

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Abstract

The invention discloses a preparation method of a heteropolytungstate / carbon nano-tube / chitosan ternary composite film modified electrode. The modified electrode is prepared by taking Dawson type tungstophosphoric acid negative ions [P2W18O62]6<-> as electrochemical active components, a CNTs-chitosan composite is obtained by taking chitosan as a dispersing agent, the composite forms a film on the surface of the electrode, and furthermore, the negative ions [P2W18O62]6<-> are assembled on the surface of the electrode under the action of electrostatics. By using the method disclosed by the invention, not only is heteropolytungstate successfully assembled on the surface of CNTs, but also the sensitivity and stability of a POMs / CNTs modified electrode are greatly improved.

Description

technical field [0001] The invention relates to a preparation method of heteropolytungstate / carbon nanotube / chitosan ternary composite film modified electrode. Background technique [0002] Carbon nanotubes (CNTs) have been a research hotspot at home and abroad because of their excellent mechanical, thermal and electrical properties. However, unmodified CNTs are almost insoluble in all solvents, which limits their applications in certain fields. Chitosan (Chitosan) is a polysaccharide biopolymer, which has good film-forming ability, high permeability and strong adhesion, and has amino and hydroxyl active groups, which meet the requirements of strong and electrochemically active preparation. CNTs composite film requirements. Moreover, chitosan is a natural cationic polyelectrolyte, and the protonation of its amino group carries a high positive charge at pH<6.5. More importantly, the composite of chitosan and CNTs combines the properties of the two materials and can prov...

Claims

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Application Information

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IPC IPC(8): G01N27/327
Inventor 郭伟华许林刘树博仝小兰
Owner EAST CHINA UNIV OF TECH
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