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In fact, graphene already exists in nature, but it is difficult to peel off a single layer structure. Graphene is made by stacking graphene on top of each other. Graphite 1 millimeter thick contains about 3 million layers of graphene. When a pencil lightly cuts across a piece of paper, it can leave a trail of several or even just one layer of graphene.
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In 2004, two scientists at the university of Manchester, Andre Geim and Konstantin Novoselov, found that they could get thinner and thinner sheets of graphite in a very simple way. They strip the graphite sheet out of highly oriented pyrolytic graphite and then attach both sides of the sheet to a special type of tape.
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And you do that over and over again, and the sheet gets thinner and thinner, and eventually they get a sheet that's just one layer of carbon atoms, and that's graphene.Since then, new methods to prepare graphene have emerged one after another. In 2009, Andre gehm and konstantin novoselov respectively discovered the integer quantum hall effect and the quantum hall effect at room temperature in single-layer and double-layer graphene systems, for which they won the 2010 Nobel Prize in physics.
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Before graphene was discovered, most physicists believed that thermodynamic fluctuations did not allow any two-dimensional crystal to exist at finite temperatures. So its discovery immediately shocked the physics community of condensates. Although both theoretical and experimental circles believe that a perfect two-dimensional structure cannot be stable at non-absolute zero, single-layer graphene can be prepared in experiments.
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On March 31, 2018, China's first automatic production line for production of graphene organic solar optoelectronic devices in shandong heze starts, the project mainly produces power under the weak light of graphene organic solar cells (hereinafter referred to as graphene OPV), cracked the application limitation, sensitive to Angle, is not easy to modelling the three solar power problem.
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On June 27, 2018, China graphene industry technology innovation strategic alliance issued the newly formulated group standard "product naming guide for graphene materials". This standard specifies the graphene graphene related materials of new products named method of internal carbon atoms arranged like graphene with sp2 hybrid orbital bonding, and has the following features: carbon atoms has four valence electrons, three of them electronically generated sp2 key, namely each carbon atom contribute a on the p z orbital bonding electrons, neighboring atoms of pz orbital direction perpendicular to the plane can form PI bond, the formation of new PI half fill status. Research confirms that the coordination number of carbon atoms of graphene is 3, between every two adjacent carbon atoms bond length of 1.42 x 10-10 meters, the Angle between the key and the key is 120 °.
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In addition to sigma bonds and other carbon atoms linked into a hexagonal ring honeycomb layered structure, each carbon atom perpendicular to the pz orbital layer plane can form a large PI bond (similar to benzene ring) through the whole layer of many atoms, and thus has excellent electrical and optical properties.
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Graphene is one of the materials with the highest known strength. At the same time, it has good toughness and can be bent. The theoretical young's modulus of graphene is up to 1.0tpa, and its inherent tensile strength is 130GPa. Reduced graphene modified by hydrogen plasma also has very good strength, with an average modulus of 0.25TPa. The graphene paper made up of graphene sheets has many holes, so the graphene paper is very brittle. However, after oxidation, functional graphene is obtained, and then made from functional graphene into graphene paper, it will be extremely strong and tough.
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