According to the Russian satellite network reported on October 19, Russian, French, Swedish and Greek scientists have cooperated to develop an industrial technology to purify graphene. The new method makes the graphene more stable. Even if it touches ozone for 10 minutes, it will be “undamaged”. . The researchers said that this achievement is an important advancement in the field of nanoelectronics technology and will greatly promote the development of this field.

Graphene is a material that is 1 million times thinner than hair. It consists of a single layer of carbon atoms arranged in a honeycomb structure. It has excellent electrical conductivity, durability and ductility and can be used to manufacture a variety of nanoelectronic devices. . During the production process, the polymer coating residue "contaminates" the graphene and reduces the internal charge carrier's fluidity. Thermal annealing, plasma stripping, and chemical solvents can remove polymer residues, but at the same time, they impair the purity of graphene. Among them, one of the most commonly used purification methods is the use of ozone. Although this method is highly reactive, ozone, while destroying the polymer residue, can cause defects in the graphene, leading to its weakening performance.

In view of this, the scientists of the Moscow State Institute of Nuclear Energy Research Institute (MEPhI) of the Russian National Nuclear Energy Research Institute used high-temperature sublimation materials of silicon carbide (SiC) to successfully obtain highly stable graphene, which has been exposed to ozone for over 10 minutes. No change; ordinary graphene suffers from poor performance in the same environment for three to four minutes.

In order to further verify the test results, scientists from Greece, France and Sweden have used computer modeling to clarify why SiC-graphene is still “undamaged” by violent oxygen radicals and is more stable: New graphene Unusual stability is obviously related to the lower roughness of epitaxial graphene on the silicon carbide susceptor.

Recent discoveries have helped to better purify graphene, resulting in high quality industrial graphene with stable electrical properties. (Reporter Liu Xia)

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