Keywords: self–organisation, self–assembly, allotropic carbon, carbon nanotubes, CNT, carbon hybrids, hybrid nanostructures, planar graphite layer, PGL, CNT–PGL nanostacks, nanoelectronics, nanotechnology, nanoparticles
Self–organised hybrid nanostructures composed of the array of vertically aligned carbon nanotubes and planar graphene multi–layer
The hybrid carbon nanostructures composed of an array of vertically aligned carbon nanotubes (CNTs) and a self–organised planar graphene multi–layer (PGL) located at the top of the array (CNT–PGL nanostructures) have been obtained by the floating catalyst CVD method. The growth mechanism of CNT–PGL nanostructures is analysed. The fundamental characteristics (morphology, elemental composition and structure) of these nanostructures were characterised by Scanning and Transmission Electron Microscopy, Atomic Force Microscopy, Energy–Dispersive X–ray (EDX), Auger and Raman spectroscopy. It has been established that PGL grows by the typical epitaxial growth of multi–layer films and CNTs grow simultaneously both via root–growth mechanism (attached to the substrate) and tip–growth mechanism (attached to the planar layer). This planar layer is a layered–graphitic structure 'graphene multi–layer' and is connected with CNTs through the catalyst nanoparticles. It consists of disordered graphitic flakes with a size of several tens of nanometres randomly oriented and overlapping one another. These flakes have a crystallite grain of about 5.2 nm in size.