Controlled synthesis, efficient purification, and electrochemical characterization of arc-discharge carbon nano-onions

Reactive Carbon Nano-Onion Modified Glassy Carbon Surfaces as DNA Sensors for Human Papillomavirus Oncogene Detection with Enhanced Sensitivity

“…In addition, the CV response shows a marked displacement (-90 mV) towards less positive potentials with respect to the GC-only system, indicating a faster electron transfer, in accord with the results obtained on the GC/CNO/PM/Fc surface. In our case, this favored electron transfer effect is larger than that recently observed for catechol-based neurotransmitters, 31 which were ascribed to the semi-metal properties and to the presence of structural defects on the CNOs that enhance electron transfer properties. 32 Thus, the combination of the unique morphological and electronic properties provided by the CNOs to the GC surfaces enhance the sensitivity of the assay and opens the way for further applications of CNO-based surfaces for the detection of other biomolecules.…”

Raman spectroscopy of polyhedral carbon nano-onions

“…They are the kind of material obtained in several experimental methods of preparation of nano-onions, as for example, the one based on a submerged arc discharge of graphite electrodes in water [19], a technique used to obtain nano-onions in the present work and a method frequently utilized for producing high-purity materials [17]. To the best of our knowledge, there is no systematic study of PCO using Raman spectroscopy.…”

“…After the mentioned seminal papers [12][13][14], Raman spectroscopy has been used systematically as a tool for characterization of nano-onions mainly to distinguish the [15][16][17], but in these papers there is no information about the fine structure of the spectra neither on their relation with the structure of the nano-onions. It is important to remark that most of the information about Raman spectra of closed-shell carbon nanostructures refers to spherical nano-onions.…”

Perylenetetracarboxylic anhydride as a precursor of fluorescent carbon nanoonion rings

“…Similar nanoonions have also been characterised in experiments performing graphite melting at ultrahigh pressure and temperature (5-30 GPa, 5000-6000 ºC), or in flame or by high power laser pulse. [25][26][27] It seems that the thermal treatment in PEG performed here causes an assembling process resulting in analogous nanoobjects, but taking place under our much milder conditions. One of the most interesting properties of C-dots and other carbon nanoforms is the observation for these nanoparticles of an intense photoluminescence.…”