Substrate-induced strain in carbon nanodisks

Abstract

Abstract:Graphitic nanodisks of typically 20 -50 nm in thickness, produced by the so-called Kvaerner Carbon Black and Hydrogen Process were dispersed on gold substrate and investigated by atomic force microscopy (AFM), field emission scanning electron microscopy (FE-SEM), and confocal Raman spectroscopy. The roughness of the gold surface was drastically changed by annealing at 400 o C. AFM measurements show that this change in the surface roughness induces changes also in the topography of the nanodisks, as they closely follow the corrugation of the gold substrate. This leads to strained nanodisks, which is confirmed also by confocal Raman microscopy. We found that the FE-SEM contrast obtained from the disks depends on the working distance used during the image acquisition by In-lens detection, a phenomenon which we explain by the decrease in the amount of electrons reaching the detector due to diffraction. This process may affect the image contrast in the case of other layered materials, like hexagonal boron nitride, and other planar hybrid nanostructures, too.

Synthesis, characterization and assessment of hydrophilic oxidized carbon nanodiscs in bio-related applications

“…35 Up to day, and due to their unique combination of morphological and structural characteristics, CNDs have been proposed as very attractive candidate nanomaterials for applications relative to electrochemistry, 26 improvement of friction properties, 36 magnetic properties 28 and llers for composite materials. 37 The particular size of these disc-like carbon nanoakes is crucial for maintaining important properties, such as electrical conductivity and on the other hand, small enough or even ideal in some cases, for application in bionanotechnology, nanomedicine and drug delivery, micromanipulation, nanochemistry etc. Like all other carbon structures, CNDs are insoluble in polar solvents, and thus industrial processing is signicantly hampered.…”

Carbon Nanodisks Decorated with Guanidinylated Hyperbranched Polyethyleneimine Derivatives as Efficient Antibacterial Agents

“…The resulting oxidized CNDs contain various oxygen-containing groups such as carboxyl, epoxy and hydroxyl groups on their surfaces, as graphene oxide has [ 28 ]. Comparing the structural characteristics of oxCNDs with those of GO, oxCNDs show a significantly more narrow size distribution combined with a well-defined disk-like shape [ 29 , 30 ], a lower ratio of C:O atoms due to the larger number of oxygen-containing groups on its surface and a higher content of functional groups located mainly at the discs edges that can be further modified [ 28 ]. Another crucial advantage is the low toxicity of oxCNDs, probably due to their disk-like structure [ 28 ], unlike GO, which is known to exhibit cytotoxicity against mammalian cells [ 31 , 32 , 33 , 34 ].…”