Method and device for uniformly cladding metallic silver on surface of carbon nano tube

Abstract

The invention discloses a method and a device for uniformly cladding metallic silver on the surface of a carbon nano tube. The method comprises the steps of preprocessing the carbon nano tube, preparing a silver-ammonia solution and a chemical plating solution, and adopting the device provided by the invention to carry out chemical plating, wherein the device comprises a vacuum pump, a collection bottle, a quartz tube, an ultrasonic atomizer, a microwave-assisted heater, a microwave leakage prevention device and a carrier gas conveyor device; carrying out ultrasonic atomization on the two solutions, contacting and mixing the two atomized matters to react, repetitively washing powder to be neutral, and drying to obtain the carbon nano tube with the surface uniformly cladded by the metallic silver. The carbon nano tube is dispersed in spray droplets, so that the dispersibility of the carbon nano tube and silver plating is improved, the phenomenon of self-decomposition of the solution in a conventional chemical plating method, the generation of large-particle monomer silver and the occurrence of silver mirror reaction are avoided, the prepared cladding layer is uniform, and the sliver particle size is nano-scaled; the whole process is simple, the device is simple and convenient, convenient to operate, and energy-saving and environmental-friendly, and mass production can be realized.

Description

technical field [0001] The invention discloses a method and a device for uniformly coating metallic silver on the surface of carbon nanotubes, belonging to the technical field of carbon nanotube chemical silver plating. Background technique [0002] Carbon nanotubes have attracted widespread attention since they were discovered in 1991. Carbon nanotubes have a high aspect ratio (within a few tens of nanometers in diameter and a few microns to hundreds of microns in length), and are currently the thinnest fiber materials. , it has exhibited excellent mechanical properties and unique electrical properties. Another type of one-dimensional material can be obtained by coating carbon nanotubes with different substances. Experiments show that the average Young's modulus of a single multilayer carbon nanotube is 1.8 TPa, showing super strong mechanical properties, and the bending strength reaches 14.2Gpa, showing super toughness, so carbon nanotubes will have great prospects in the...

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Problems solved by technology

[0004] Coating the outer surface of carbon nanotubes with metal substances will form a continuous high-strength bond between carbon nanotubes and the metal matrix, overcoming the shortcomings of poor bonding between carbon nanotubes and metal substrates. This is the use of carbon nanotubes to prepare super strong An indispensable key link for composite materials, because many metals can be deposited on almost all processed substrates by electroless plating, so carbon nanotubes can be coated by electroless plating. Many researches have been done on electroless plating of fibers or fibers, and some technologies have been matured. However, very little research has been done on electroless plating of nanoscale particles, especially for carbon nanotubes, which have a large surface curvature and are difficult to disperse. The technical requirements are higher, and its highly graphitized structure makes the surface reactivity very low, making it difficult to obtain a continuous and dense coating. In the traditional electroless plating process, the carbon nanotubes themselves are difficult to disperse uniformly, and the metal also It is difficult to uniformly plate on the surface, and due to the spatial inhomogeneity of the reaction in the solution, some metal particles grow too much in the solution, and the carbon nanotubes cannot be plated as expected

[0005] It can be seen from the literature that the main solutions to these problems are as follows: 1) Adding a dispersant to the electroless plating solution can relatively reduce the occurrence of agglomeration problems, but it will affect the binding force of the electroless plating silver and carbon nanotubes

2) The combination of stirring and ultrasonic vibration is adopted, but now the ultrasonic vibration device is generally placed outside the container, and the effect of the vibration is greatly weakened

3) To solve the problem of uneven plating by slowing down the dripping speed of the solution, but because there is an excessive concentration gradient in the reaction solution, it is difficult to solve the above problems simply by controlling the dripping speed

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