It is very inaccurate to say that graphite is a semiconductor. in some frontier research fields, carbon materials such as carbon nanotubes, carbon molecular sieve films and diamond-like carbon films (most of which have some important semiconductor properties under certain conditions) belong to graphite materials, but their microstructure is significantly different from the typical layered graphite structure.
In graphite, there are four electrons in the outermost layer of carbon atoms, three of which form covalent bonds with the electrons of other carbon atoms, so that each carbon atom has three electrons to form covalent bonds, and the remaining one is called π electrons. These π electrons move approximately freely in the space between layers, and the conductivity of graphite mainly depends on these π electrons. Through chemical methods, after the carbon in graphite is turned into a stable element, such as carbon dioxide, the conductivity is weakened. If the graphite is oxidized, these π electrons will form covalent bonds with the electrons of oxygen atoms, so they can no longer move freely, and the conductivity will be greatly reduced. This is Conductive principle of graphite conductor.
The semiconductor industry is mainly composed of integrated circuits, optoelectronics, separators and sensors. New semiconductor materials need to follow many laws to replace traditional silicon materials and win market recognition. Photoelectric effect and Hall effect are the two most important laws today. Scientists observed the quantum Hall effect of graphene at room temperature and found that graphene will not produce back scattering after encountering impurities, indicating that it has super conductive properties.In addition, graphene is almost transparent with the naked eye and has very high transparency. Graphene has excellent optical properties and will change with its thickness. It is suitable for application in the field of optoelectronics. Graphene has many excellent properties and will be used in many fields, such as display screen, capacitor, sensor and so on
Post time: Jan-07-2022