Graphene sheet, molecular structure

These properties are mainly originated from the molecular structures of CNTs, which consist of graphene sheets rolled to form hollow cylinders with an extremely high aspect ratio [5]. Moreover, CNTs can be ether metallic or semiconducting tubes, depending on their diameter and/or chirality [5]. There are two types of CNTs SWNTs and MWNTs. Details, such as structure, synthesis methods, application and properties, are well documented [4], [5], [6]. 

When CNTs were added to the solution, a rapid drop in the electrode potential and an increase in pH were observed in the first stage (stage 1). CNTs can be envisaged as roll-up graphene layer sheet, regarding their molecular structure. The basic sites, which consist of delocalized n electrons, on the surface of the CNTs are responsible for the rise in pH in the first stage, as they can act as Lewis bases capable of complexing protons to its jt structure. ... 

These n interactions can be equally critical in materials chemistry applications, including self-assembled supramolecular architectures.For example, molecular wires can be formed from stacks of aromatic macrocycles.The binding of small molecules to carbon nanotubes and attraction between graphene sheets are both determined by noncovalent n interactions. The crystal structure and charge-transport properties of 7t-conjugated organic materials are also largely determined by n-n interactions. ... 

Molecular structure of graphene sheet, SWCNTs and MWCNTs [17]. 

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