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Russian and American scientists have figured out how to turn graphene into a nanometer-thick diamond film
Diamonds in the form of the thinnest films – in fact a two-dimensional analogue of diamond – are of practical interest as sources of single photons in quantum computers or as the basis for semiconductors with a wide band gap, which guarantees the highest efficiency. But thin-film diamonds with a thickness of several atomic layers are almost impossible to create using the traditional method. I had to develop a new.
Image source: NUST MISIS
As the press release of NUST MISIS informs us, Russian scientists, together with their colleagues from the United States, have developed a technique that makes it possible to transform multilayer graphene into the thinnest nanodiamond film.
Theoretically, the transformation of multilayer graphene into the thinnest nanodiamond film six years ago was substantiated by a group of scientists headed by Pavel Sorokin, Doctor of Physics and Mathematics NUST MISIS, and Professor B.AND. Jacobson from the USA. In theory, layers of graphene stacked on top of each other can be turned into so-called diaman, a two-dimensional analogue of diamond that will remain stable at normal pressure and room temperature.
In their work, scientists substantiated stacking up to 30 layers of graphene, but in practice, more than two layers could not be folded. It turned out that the formation of a “two-dimensional” diamond is prevented by the occurrence of strong mechanical stresses in the structure of multilayer graphene when hydrogen or fluorine atoms are deposited on its surface. And the more layers, the more the diamond nucleation is suppressed (the formation of embryonic structures for the transition to a new state).
The method proposed by a group of scientists for the production of nanometer-thick diamond films provides for the facilitation of the diamond formation process with the help of “small and only local pressure” on the structure during the deposition process. “. In addition, it is required to arrange the graphene layers in a special way. But the result justified the effort. The proposed technology turned out to be achievable in laboratory conditions and can be modified for commercial use in enterprises, which means the appearance of ultra-strong coatings and completely new electronics. Good and promising discovery. There would be more such.