Temperature sensor preparation method based on carbon nano tube three-dimensional network film

Abstract

The invention discloses a temperature sensor preparation method based on a carbon nano tube three-dimensional network film. The temperature sensor preparation method mainly solves the problems that the method which takes a carbon nano tube conduction network in a polymer as a temperature sensor has the disadvantages of big forming difficulty of composite material, integral mechanical property affection and high cost. The temperature sensor preparation method comprises the following realization steps of: a) preparing monodisperse aqueous solution of the carbon nano tube by the carbon nano tube and surface dispersant mixture with a mechanical fusion method; b) pouring the monodisperse aqueous solution of the carbon nano tube into an upper container of a vacuum suction filtration device, and carrying out suction filtration to form a film on a filtering film; c) putting a carbon nano film and the filtering film into a drying oven, 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 copper conductor onto the surface of the carbon nano tube film by conductive adhesive, embedding the sensor into the composite material, or externally pasting the sensor on the external specific position of the composite material, and forming according to the composite material solidification technology. The resistivity of the carbon nano tube three-dimensional film temperature sensor can be 10<-3>-10<-5>omega.m, and the carbon nano tube three-dimensional film temperature sensor has a higher resistance-temperature linear relation.

Description

technical field [0001] The invention relates to a method for preparing a temperature sensor, in particular to a method for preparing a temperature sensor based on a carbon nanotube three-dimensional film, which is mainly used in the technical fields of electrical conductivity and temperature monitoring of composite materials. Background technique [0002] The temperature field measurement methods in the composite material structure mainly include thermocouples and fiber Bragg grating temperature sensors, etc., especially because of its small size, high measurement accuracy, absolute measurement and distributed measurement, fiber Bragg grating has become an important means of composite material health monitoring. , but its size is 2 orders of magnitude larger than the fiber diameter in the composite material, which will affect the performance of the composite material. [0003] Carbon nanotubes have very high electrical conductivity, and their electrical conductivity has a go...

AI Technical Summary

Problems solved by technology

However, the intermolecular force of carbon nanotubes is strong, and when the amount of dispersion in the polymer matrix is ​​large, they tend to agglomerate. At the same time, the huge specific surface area of ​​carbon nanotubes will also increase the viscosity of the polymer matrix, making it difficult to form composite materials. , which affects the overall mechanical properties of the composite material, and also increases the cost

Moreover, the electrical conductivity of the composite material is mainly determined by the content and dispersion uniformity of carbon nanotubes. In order to obtain an effective carbon nanotube network structure, methods such as shear force stirring, three-roll stirring and ultrasonic dispersion are usually used, but the carbon nanotubes in the resin matrix The content of nanotubes is limited, and the electrical conductivity of the obtained carbon nanotube network often cannot meet the requirements of engineering applications

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