The difference between graphite and graphene


The difference between graphite and graphene is only on […]

The difference between graphite and graphene is only one word, but the shape and performance are very different. Next, the graphite milk manufacturers will take you to understand graphene and the difference between graphene and graphite.


In fact, graphene already exists in nature, but it is difficult to peel off the single-layer structure. One layer of graphene is graphite, and a 1 mm thick graphite contains about 3 million layers of graphene.


Why is graphene transparent?


For graphene, the concept that the scientific community has adopted is: a single layer of two-dimensional material with a hexagonal honeycomb lattice composed of carbon atoms and sp2 hybrid orbitals. It is transparent because its thickness is measured in atomic units. A single layer of graphene is only 1 carbon atom thick, or 0.34 nanometers, which is equivalent to one-twentieth of the diameter of a human hair.



The difference between graphite and graphene


First, graphite and graphene are both carbon atoms. The microstructure of graphite is a layer of graphite molecules stacked like book pages, which is a three-dimensional substance. Graphene is a two-dimensional substance in which carbon atoms are arranged in a single layer. The International Organization for Standardization (ISO) determined that when the number of layers is less than or equal to ten, it can be called graphene, otherwise, it should be called graphite.


The single-layer graphite molecule is graphene, because the single-layer graphite molecule is less than one nanometer thick, and can be regarded as a two-dimensional substance. Therefore, the biggest difference between graphene and graphite is the different dimensions. Graphene is the basic unit that constitutes other carbon allotropes. It can be folded into fullerene (zero dimension), curled into carbon nanotubes (one dimension), and stacked into graphite (three dimensions).


Second, the same substance composed of carbon, graphene shows many properties that graphite does not have, because the upper and lower surfaces of the single-layer graphite molecules in graphite are connected to the carbon atoms to form bonds, while the upper and lower surfaces of graphene When exposed to air, its electron transport characteristics and mechanical properties will be greatly affected. Graphene has proven to be the thinnest and hardest substance found in the world. Another characteristic of graphene is that its conductive electrons can not only move in the lattice without obstacles, but also extremely fast, far exceeding the speed of electrons moving in metal conductors or semiconductors. Also, its thermal conductivity exceeds all known substances.