也因此,算它们的相互作用的时候不需要刻意考虑单体的变形能。优化后的结构的xyz文件可以在http://sobereva.com/attach/615/C18-graphene.xyz下载。 之后笔者计算了石墨烯片段与18碳环的高精度结合能,结果是-27.4 kcal/mol(-114.6 kJ/mol),这已经是很大的数值了,说明18碳环与石墨烯之间的pi-pi堆积作用相当强,能...
Graphene is a substance made of pure carbon, with atoms arranged in a regular hexagonal pattern similar to graphite, but in a one-atom thick sheet. It is an allotrope of carbon whose structure is a single planar sheet of sp 2 -bonded carbon atoms that are densely packed in a honeycomb ...
A. Silicon atoms. B. Carbon atoms. C. Oxygen atoms. D. Hydrogen atoms. 相关知识点: 试题来源: 解析 B。解析:文章中明确提到“Graphene is an extremely thin and strong material. It is made up of a single layer of carbon atoms arranged in a hexagonal lattice.”,石墨烯是由一层碳原子组成...
Glassy carbon is a graphene-rich form of elemental carbon obtained from pyrolysis of polymers, which is composed of three-dimensionally arranged, curved graphene fragments alongside fractions of disordered carbon and voids. Pyrolysis encompasses gradual heating of polymers at ≥ 900 °C under inert ...
Blue and gray spheres represent nitrogen and carbon atoms, respectively. Structural analysis shows that, g-C3N4 possesses a stacked two-dimensional structure. This indicates that incorporation of two-dimensional graphene sheet (GS) into the g-C3N4 will result in a homogeneous composite (GSCN) which...
(x) of less than 1.0, in which the principal phases are carbon wherenitrogen atomsare either substituted for carbon atoms or attached as nitrogen-containing functional groups. The materials having CNxwith x > 1.0 are often called nitrogen-rich carbonnitridesin the literatures. In the present...
2a–c, it is found that the N atoms are uniformly distributed in the NG sheet, indicating that uniformly distributed vacancies were generated after the thermal defluorination of FG. It is known that, as carbon monofluoride is unstable at a high temperature, thermal defluorination of FG can ...
Uptake of CO2on pyridinic-N-substituted graphene. Schematic illustration of pyridinic N at pore edge and -NH2near pore edge and binding of these groups with CO2. In the schematic, the graphene lattice consists of carbon atoms shown in brown, with pyridinic nitrogen (blue atoms) substituted at ...
Carbon Sheets an Atom Thick Give Rise to Graphene Dreams. The article discusses the material graphene, a single layer of carbon atoms laterally arranged as hexagons. It refers to widespread interest in graphene in... SERVICE,E Robert - 《Science》 ...
Carbon’s small size allows it to form multiple bonds with many other small atoms, including carbon atoms, and is prevalent in a large number of chemical compounds. Carbon-based compounds are the basis for all living systems and comprise the structure of fossil fuels in the form of ...