What are carbon nanotubes?
Carbon nanotubes (CNT), tubular nano-scale graphite crystals, are seamless nano-scale tubes formed by curling single-layer or multi-layer graphite sheets around the central axis at a certain helical angle. The C of each layer is SP2 hybridized to form A cylindrical face of a hexagonal plane. Carbon nanotubes also have the characteristic of naturally occurring carbon crystals. Make carbon nanotubes a known carbon atom material. Science discovers nature, and nature verifies science.
Carbon nanotubes were discovered by Japanese scientist Sumio Iijima in 1991. They have excellent field emission properties and are made into cathode display tubes and hydrogen storage materials. In 1992, researchers discovered that carbon nanotubes exhibit the specific conductivity of semiconductors or good conductors depending on the coiled structure of the tube wall; in 1995, scientists studied and confirmed its excellent field emission performance; in 1996, Chinese scientists realized carbon nanotubes. Large-area directional growth of nanotubes; in 1998, researchers used carbon nanotubes as electron tube cathodes; in 1998, scientists used carbon nanotubes to make field-effect transistors that work at room temperature
1. The adsorption properties of carbon nanotubes. Carbon nanotubes have a large specific surface area, special channel results, and graphite-like interlayer gaps between multi-walled carbon nanotubes, making them the most potential hydrogen storage materials and playing an important role in fuel cells.
2. Electromagnetic properties of carbon nanotubes. Carbon nanotubes have unique electrical conductivity, high thermal stability and intrinsic mobility, large specific surface area, and micropores concentrated in a certain range, which meet the requirements of ideal supercapacitor electrode materials. The electromagnetic effect of carbon nanotubes also has the characteristic properties of positive and negative fields at both ends and unipolar particles. The former exists in a composite quantum state, which is used in people's lives as composite materials in the fifth row below, and the unipolar carbon The nature of the particles is that they can form nanowires that can jump in the particle lattice, and its energy efficiency requires higher radiation energy.
3. Emission performance of carbon nanotubes. The diameter of single-walled carbon nanotubes is usually several nanometers, the length can reach tens to hundreds of microns, the aspect ratio is very large, and its structural integrity is good, the conductivity is very good, the chemical properties are stable, and it has high-performance field emission. The basic structural characteristics of materials. This high performance is the aggregation of photoelectric atom scattering energy efficiency, which has a certain energy efficiency of cold dark matter.
4. Mechanical properties of carbon nanotubes. Theoretical and experimental studies have shown that carbon nanotubes have extremely high strength, and the theoretical calculation value is 100 times that of steel. At the same time, carbon nanotubes have extremely high toughness and are very soft, and are considered to be the superfibers of the future. The mechanical concept of carbon nanotubes here refers to the atomic mechanical properties of closed identical particles that exist as a single element.
5. Chemical properties of carbon nanotubes. Carbon nanotubes have been used to disperse and stabilize small metal particles at the nanoscale. Catalysts made from carbon nanotubes can improve the options for heterogeneous catalysis.