Abstract Recently, Virginia Commonwealth University and universities in China, Japan and other countries have discovered a new type of carbon allotrope, which is called "pentagon graphene." This pentagonal graphene contains only carbon and is in the form of flakes. Its unique...
Recently, Virginia Commonwealth University and universities in China, Japan and other countries have discovered a new type of carbon allotrope, which is called "pentagonal graphene." This pentagonal graphene contains only carbon and is in the form of flakes. Its unique shape is like a pentagonal tile laid on the streets of Cairo. 
This newly discovered pentagonal graphene is a single-layer sheet-like carbon structure material similar to the tiles laid in Cairo streets, with thermal stability and mechanical stability. (Source: Virginia Commonwealth University)
As a Distinguished Professor of the Department of Physics, Faculty of Humanities and Sciences, Virginia Commonwealth University, Dr. Puru Jena, Senior Writer of the paper, pointed out: "The carbon structures that have been discovered so far mainly include fullerenes, carbon nanotubes and graphene, each with its own unique characteristics. The structure of pentagon graphene belongs to this category."
A paper titled "Pentagon Graphene - A Novel Carbon Allotrope" will appear in the Proceedings of the National Academy of Sciences, based on a joint study between Peking University and the Virginia Commonwealth University. The authors include not only Jena and Wang, but also Dr. Zhang Shunhong from Peking University, Dr. Zhou Jian from Virginia Commonwealth University, Dr. Chen Xiaoshuang from Shanghai Academy of Sciences, and Dr. Yoshiyuki Kawazoe from Northeastern University in Sendai, Japan.
Professor of Peking University and associate professor of the Virginia Commonwealth University, Dr. Wang Qian noticed the work of depicting the pentagon tiles on the walls of Cairo on the restaurant wall while dining with her husband in a Beijing restaurant. After telling her husband that the work consisted only of a pentagon structure, Dr. Wang took the picture and sent it to the students and said to them: "I think our lab can also make this pentagon. The carbon structure, in theory, is structurally stable, but needs to be carefully examined." The student eventually made this pentagon carbon structure. It turns out that this pentagon's carbon structure is beautiful and simple.
The carbon structure is generally a hexagonal structure, sometimes doped with some pentagons, and the pentagonal graphene is a two-dimensional carbon structure composed entirely of pentagons. Pentagon graphene materials synthesized using computer simulation may be superior to graphene in certain applications. Because the pentagonal graphene has mechanical stability, high strength, and high temperature resistance up to 1000 Kelvin.
Jena said: "People say 'diamonds are long-lasting' because the conversion of diamonds back to graphite requires extremely high energy. Again, this is also applicable to pentagonal graphene. Pentagon graphene has some interesting Characteristics, pentagonal graphene is a semiconductor, and graphene is a conductor. When graphene is rolled up to form carbon nanotubes, it can be used as a metal or a semiconductor, but the pentagonal graphene is rolled up to form a nanotube. For the semiconductor."
The pentagonal graphene is also excellent in extensibility. Wang said: "When drawing graphene, the graphene stretches in the tensile direction while shrinking in the vertical direction. However, when the pentagonal graphene is stretched, the pentagonal graphene expands in both directions simultaneously. â€
The Poisson's ratio of pentagonal graphene is negative, and the mechanical properties of this material are rare and have potential applications.
In short, pentagonal graphene can be used in many fields such as electronics, biomedicine, and nanotechnology.
Jena said: "Our next step is to synthesize pentagonal graphene. The performance of pentagon graphene is very stable. The problem is how to synthesize pentagonal graphene. The article reflects some of our ideas. This idea is based on theoretical computer simulation results, but we have every reason to believe that such predictions can be achieved. Once the pentagon graphene is successfully synthesized, it will open up a whole new carbon field. Before that, two-dimensional The carbon structure is never completely made up of pentagons."
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