A preparation method of strain sensor based on carbon nanotube three-dimensional network film

Abstract

The invention discloses a temperature sensor preparation method based on a carbon nano tube three-dimensional network film. The strain sensor preparation method mainly solves the problems that the carbon nano tube sensing technology based on the external of the polymer can affect the composite material molding and composite material mechanical property. The strain sensor preparation method comprises the following realization steps of: a) preparing monodisperse aqueous solution by mechanically mixing the mixture of the carbon nano tube and surface dispersant; b) pouring the monodisperse aqueous solution of the carbon nano tube into a container of a vacuum suction filtration device, and carrying out suction filtration to form a film on a filtering film; c) compacting a carbon nano film and the filtering film, putting a carbon nano film and the filtering film into a drying oven for solidifying, and stripping the filtering film to obtain a three-dimensional film after solidification is finished; and d) cutting a rectangular structure from the film, fixing a lead onto the surface of the carbon nano tube film by, embedding the sensor into the specific position in the external of the composite material, and forming according to the composite material solidification technology. The the carbon nano tube three-dimensional film strain sensor has good interface combination properties, high strain sensing accuracy and linear repeatability, can be molded with the composite materials, and is applicable to monitor strain filed of the external structure.

Description

technical field [0001] The invention relates to a method for preparing a sensor, in particular to a method for preparing a strain sensor based on a carbon nanotube three-dimensional thin film, and belongs to the technical field of material science. Background technique [0002] Carbon nanotubes are excellent sensor materials due to their excellent thermodynamic properties, piezoresistive properties and electrical properties. When the carbon nanotubes are directly dispersed in the polymer matrix, and the strain is monitored through the resistance change of the composite material, the strain and resistance of the carbon nanotube composite material can show a good linear relationship, but the intermolecular force of the carbon nanotubes is relatively large , when directly dispersed in the polymer matrix, its huge specific surface area will lead to an increase in the viscosity of the resin matrix, making it difficult to form the composite material, thereby affecting the mechanic...

AI Technical Summary

Problems solved by technology

When the carbon nanotubes are directly dispersed in the polymer matrix, and the strain is monitored through the resistance change of the composite material, the strain and resistance of the carbon nanotube composite material can show a good linear relationship, but the intermolecular force of the carbon nanotubes is relatively large , when directly dispersed in the polymer matrix, its huge specific surface area will lead to an increase in the viscosity of the resin matrix, making it difficult to form the composite material, thereby affecting the mechanical properties of the composite material. At the same time, due to the low content of carbon nanotubes, it is difficult to disperse And other issues will also affect the construction of carbon nanotube sensing network and sensing accuracy

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