Carbon nanotubes are new polymer nanomaterials with excellent performance, great application potential and stable performance.
The most prominent structural feature of Carbon Nanotube Conductive Paste is that it is composed of single or multiple layers of graphite sheets curled around the same center. Carbon nanotubes, referred to as CNT in English, belong to the Fuller carbon system. They are micrometer-sized in length and nanometer-sized in diameter. They are the most characteristic one-dimensional nanomaterials. On a macroscopic scale, carbon nanotubes are black powders. On a microscopic scale, carbon nanotubes are carbon molecules composed of coaxial carbon tubes. Each layer of carbon tubes is made up of carbon atoms densely laid in a hexagonal pattern, similar to the layered structure of graphene, and the layers are kept at a fixed distance of about 0.34nm. Although the structure of carbon nanotubes is similar to that of polymer materials, its structure is much more stable than that of polymer materials. It is the material with the highest melting point known so far.
Carbon Nanotube Conductive Paste is divided into different categories according to different characteristics. From a commercial perspective, it is usually classified according to the number of layers and conductivity of the tube wall. According to the number of layers of carbon tubes, carbon nanotubes can be divided into single-walled carbon nanotubes and multi-walled carbon nanotubes; in terms of conductivity, carbon nanotubes can be metallic or semiconducting, and even different parts on the same carbon nanotube can show different conductivity. Therefore, according to the difference in conductive properties, it can be divided into metallic carbon nanotubes and semiconducting carbon nanotubes.
The unique structure and chemical bonds of Carbon Nanotube Conductive Paste give it unique mechanical, electrical, thermal and chemical properties, making it widely used in many fields.
Mechanical properties
1) Highest specific strength: The covalent bonds connecting carbon atoms in carbon nanotubes are the most stable chemical bonds in nature. Carbon nanotubes have extremely high tensile strength and elastic modulus. At the same time, the density of carbon nanotubes is only 1/6 of that of steel, making it the material with the highest specific strength that can be prepared at present.
2) Strong flexibility: Carbon nanotubes are strong but not brittle. When bending carbon nanotubes or applying pressure to them axially, even if the external force exceeds the Euler strength limit or bending strength, the carbon nanotubes will not break, but will first bend at a large angle. When the external force is released, the carbon nanotubes return to their original shape.
Electrical properties
3) Good conductivity: The structure of carbon nanotubes is the same as the sheet structure of graphite, and has good conductivity. The resistance of carbon nanotubes is independent of their length and diameter. When electrons pass through carbon nanotubes, they do not generate heat to heat the carbon nanotubes. The transmission of electrons in carbon nanotubes is like the transmission of light signals in optical fiber cables. The energy loss is small, and it is an excellent battery conductor.
4) Excellent thermal conductivity: Carbon nanotubes have extremely high thermal conductivity, which is twice that of diamond at room temperature. It is the best known thermal conductive material. In addition, the heat exchange performance of carbon nanotubes in the axial direction is very high, while the heat exchange performance in the radial direction is relatively low. Through appropriate orientation, carbon nanotubes can be synthesized into highly anisotropic thermal conductive materials.
5) Good hydrogen storage performance: Carbon nanotubes have a high specific surface area and have excellent hydrogen storage capacity after treatment.
6) Excellent lithium insertion properties: The hollow tube cavity of carbon nanotubes, the gaps between tubes, the gaps between the layers of the tube wall, and various defects in the tube structure provide abundant storage space and transportation channels for lithium ions.
7) Chemical stability: Carbon nanotubes are chemically stable and have acid and alkali resistance. Adding carbon nanotubes to polymer composites can improve the acid and oxidation resistance of the material itself.
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