Preparation of carbon nanotube composite material electrochemical sensor capable of detecting dopamine and paracetamol simultaneously

Abstract

The invention provides a carbon nanotube composite material prepared from a branching macromolecule modified carbon nanotube with an amphiphilic photoelectric activity function and a preparation method of an electrochemical sensor with the carbon nanotube composite material, and belongs to the field of macromolecule self-assembling and composite material electrochemical sensors. The carbon nanotube composite material electrochemical sensor is prepared by the following steps: (1) firstly, synthesizing a macromolecule with an amphiphilic photoelectric activity branching function; (2) modifying a carbon nanotube with the synthesized functional macromolecule to prepare the water dispersible carbon nanotube composite material; (3) dropwise adding carbon nanotube composite material dispersion liquid onto a clean electrode surface and crosslinking under UV irradiation to form a membrane; and (4) inserting a modified electrode into a lithium perchlorate / acetonitrile solution for electric polymerization to prepare the carbon nanotube composite material electrochemical sensor. The method has energy-saving and environment-friendly effects by using water as a solvent. Besides, the prepared nano composite material sensor is good in stability and high in sensitivity, and the service life of the nano composite material sensor is prolonged.

Description

Technical field: [0001] The invention relates to the technical field of the combination of macromolecular self-assembly and electrochemical sensors, in particular to an amphiphilic photoelectrically active functional branched macromolecule used to modify carbon nanotubes to prepare carbon nanotube composite materials and its application to the preparation of electrochemical sensors . Background technique: [0002] Dopamine (DA), as an important neurotransmitter in the human body, plays an important role in regulating human emotions; paracetamol or acetaminophen (PA) is an important and widely used analgesic and antipyretic . At present, the technologies used to detect such substances are mainly high-performance liquid chromatography, fluorescence spectrophotometry, mass spectrometry and spectrophotometry, but the disadvantages of these traditional methods are that the detection equipment is expensive and the detection time is long; Chemical detection methods are relatively...

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Problems solved by technology

At present, the technologies used to detect such substances are mainly high-performance liquid chromatography, fluorescence spectrophotometry, mass spectrometry and spectrophotometry, but the disadvantages of these traditional methods are that the detection equipment is expensive and time-consuming; Chemical detection methods are relatively simpler, more efficient, and less expensive

[0003] The unique structure of carbon nanotubes (CNTs) endows them with excellent mechanical, electrical, and chemical properties. However, due to the special structure of carbon nanotubes, their solubility is poor, and they are easy to entangle and agglomerate. Currently, some effective methods such as polymer modification etc. By covalent or non-covalent modification, the van der Waals force between carbon nanotubes can be destroyed, and a better dispersion effect can be obtained, but one disadvantage of modification in this way is that Due to the entanglement and accumulation of polymers on the surface of carbon nanotubes, the electron transport performance of the surface of carbon nanotubes is affected, and the covalent bond modification destroys the C-C structure of carbon nanotubes, which destroys some inherent properties of carbon nanotubes. Unfavorable factors have seriously limited the application research of carbon nanotubes

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