Chinese doctrine synthesized record solid thin films based on graphene. Mixing graphene with layered black phosphorus (fostream) and an organic substance, a molecule which contains two flat aromatic fragment, the authors were able to obtain films with record energy value of the ultimate strain in 52 megajoules per cubic meter and twice improved properties electrical and thermal conductivity. The results of a study published in the journal Proceedings of the National Academy of Sciences.
Graphene, a layer of carbon atoms with thickness of one atom, has unique electronic and mechanical properties, potentially making it popular in a large number of fields of science and technology. Many methods of creating thin films based on graphene does not allow to specify the type of interactions between the planes of the sheets, resulting in strain in the structure is allocated inefficiently, and the tapes are not very durable. Similarly, three-dimensional, two-dimensional strength-of-materials can be improved by preventing the formation and growth of cracks, or creating a plastically deformable materials.
Recently, scientists have shownthat various relationships between planes, such as hydrogen bonds, ionic bonds, π-π interactions and covalent bonds improves the strength of graphene. Such interlayer effects can not only prevent the formation of cracks in the film, but also to improve properties related to plastic deformation.
Graphene is often compared with fosforera — layered two-dimensional material, black phosphorus. Unlike graphene, have fosforera a prohibited area, the width of which can be changed by modifying the structure of the material than it is with 2014 interested scientists.
Inspired by the structure of nacre, which is composed of hexagonal platelets of calcium carbonate crystals located parallel layers and connected by elastic biopolymers, Tianzhu, Zhou (Zhou Tianzhu) with colleagues from the University of Bachinskogo synthesized solid film of graphene phosphorane and the binder polymer. They mixed suspension of graphene oxide and fosforera, the mixture was filtered under vacuum and dried for 12 hours at a temperature of 50 degrees Celsius. Then, to get rid of oxidized functional groups, restored yodovidona and washed with ethanol. The obtained film was placed in a solution of organic substances (1-aminopyrene disuccinimidyl of suberate), whose molecules contain two linked flat aromatic peredovyh of the site, which resemble a part of the graphene sheet.