Construction method and application of carbon nanotube-fullerene complex-based non-enzymatic electrochemical sensor

Abstract

The invention discloses a construction method and application of a carbon nanotube-fullerene complex-based non-enzymatic electrochemical sensor. The manufacturing method of the sensor comprises the following steps of (1) pre-activating multi-walled carbon nanotubes (MWCNTs); (2) preparing a composite material (MWCNTs-ZnP-C60) of the multi-walled carbon nanotubes and zinc porphyrin fullerene (ZnP-C60); and (3) rousing the electrochemical activity of the MWCNTs-ZnP-C60 by virtue of tetraoctyl ammonium bromide (TOAB), modifying the MWCNTs-ZnP-C60 on the surface of a glassy carbon electrode (GCE) and constructing the non-enzymatic electrochemical sensor (TOAB / MWCNTs-ZnP-C60 / GCE). The ZnP-C60 is utilized as an electron intermediate, the MWCNTs are taken as an electron transfer promoter, and the TOAB is taken as an electronic wake-up agent of the intermediate ZnP-C60, and the ZnP-C60, the MWCNTs and the TOAB work together to prepare an MWCNTs-ZnP-C60 nano-complex with good electrochemical activity; and the non-enzymatic electrochemical sensor with good electro-catalytic property is constructed in an TOAB membrane and is applied to detection of nitrite.

Description

technical field [0001] The present invention relates to an electrochemical sensor, more specifically, to a construction method and application of a non-enzyme electrochemical sensor based on a carbon nanotube-fullerene composite. Background technique [0002] Porphyrin has a tetrapyrrole macrocyclic structure, and its structure is very stable. Metalloporphyrins are formed when two protons in the porphyrin ring are replaced by metal atoms. Whether it is porphyrin or metal porphyrin compound, they have high melting point, dark color, most of them are insoluble in water and stable to heat and other physical properties. At the same time, they are prone to redox reactions, complexation reactions, ligand exchange reactions and other chemical properties. Fullerene C with unique three-dimensional stereostructure and electronic structure 60 , has relatively small electron recombination energy and strong electron-withdrawing properties, making fullerene C 60 become good electron a...

AI Technical Summary

Problems solved by technology

For example, when an imprinted membrane whose thickness is difficult to control is used in an electrochemical experiment, its electron transport efficiency is very poor, and the repeatability is also poor, resulting in The application of this modified electrochemical sensor is more difficult

Electrochemical sensors constructed of multi-walled carbon nanotubes (MWCNT) in the prior art still have technical defects such as low detection sensitivity, instability, and poor reproducibility.

Images