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When discussing graphene, we need to first point out the natural mineral graphite that is widely existing in our life.

As an allotrope of carbon, graphite is a split product, and the carbon atoms inside graphite are arranged layer by layer. Carbon atoms in the exact same layer “hold hands” and are closely connected, but the combination of carbon atoms between various layers is loose, like a pile of playing cards. With a gentle press, the cards will certainly slide apart.

(Graphene Powder)

From the point of view of chemical framework, graphite is a transitional crystal between atomic crystals, steel crystals and molecular crystals. In the crystal, carbon atoms in the very same layer type covalent bonds with sp2 hybridization, each carbon atom is connected to three various other carbon atoms, and 6 carbon atoms develop a normal hexagonal ring on the very same aircraft, extending to form a sheet framework.

If graphite is a stack of playing cards, then graphene is just one of the cards in this stack of playing cards. Graphene is a two-dimensional material composed of a single layer of carbon atoms. Stacking graphene layer by layer is graphite. A 1 mm thick graphite contains about 3 million layers of graphene.

Although graphene exists in nature, it is tough to remove a single layer structure.

Greater than twenty years earlier, Andre Geim and Konstantin Novoselov, researchers at the University of Manchester in the UK, believed that there must be a way to obtain a single layer of graphite.

How can a solitary layer of graphite be removed? Scientists took a very “basic and crude” technique – sticking it with tape.

“Much like when we compose a typo theoretically, we will certainly stick the typo with tape.” Based on this, researchers boldly link that if tape can stick to the surface area of paper, can it additionally stay with layers of graphite?

( TRUNNANO Graphenen Powder)

In the experiment, researchers stuck both sides of pyrolytic graphite flakes to an unique tape, and tore off the tape, the graphite sheet was divided right into 2. Although the thickness of graphite at this time is still much from that of a solitary layer of graphite, researchers have actually validated the expediency of this approach – each time the tape is used, the graphite ends up being thinner. By demanding using this “mechanical exfoliation technique” to repeat the procedure, they finally obtained a thin sheet consisting of just one layer of carbon atoms, which is graphene.

Nevertheless, this method of consistently scrubing graphite sheets with tape to acquire graphene has reduced manufacturing performance and can only be utilized to prepare micron-thick graphene, and can not be mass-produced industrially.

Later on, with the renovation of scientific and technological levels, the preparation method of graphene has likewise made wonderful development. Presently, in addition to this traditional physical and mechanical exfoliation technique, there are also numerous approaches for preparing graphene, such as redox method, solvent exfoliation method, chemical vapor deposition, and so on

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