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By using non-graphitizable and graphitizable carbons prepared from poly(furfulyl alcohol) and poly(vinyl chloride), respectively, an attempt is made to determine the number of carbon edge sites by analyzing their hydrogen content and the amounts of surface oxygen complexes and localized spins. It is found that, at the present preparation conditions, the number of hydrogen-terminated edges is much...
A combined electrochemical and in situ frequency modulation atomic force microscopy (FM-AFM) study of phenalenyl derivatives, tetra tert-butyl derivatives of s-indacenodiphenalene (TTB-IDPL), adsorbed on a highly oriented pyrolytic graphite (HOPG) electrode was investigated. The cyclic voltammetry (CV) showed stable and adsorption-type redox peaks from TTB-IDPL at the double-layer region of the HOPG...
The first- and second-order Raman spectra of carbon nano-onions (CNOs), produced via annealing of detonation nanodiamonds with a mean grain size of ∼5nm in the argon ambience at the maximal temperature of annealing process (T MAX ) varying from 1500 to 2150°C, are analyzed together with the high-resolution transmission electron microscopy (HRTEM) images. The combined analysis provides a deep...
We have studied the electronic structure of the surface of graphite irradiated by Ar+ ions with various kinetic energies using in situ near-edge X-ray absorption fine structure spectroscopy in order to verify the appearance of an edge state over a macroscopic area and the variation of the edge state feature by severely damaging a sample. The disruption of the π bonding network of graphite is manifested...
Interest in two-dimensional, sheet-like or flake-like carbon forms has expanded beyond monolayer graphene to include related materials with significant variations in layer number, lateral dimension, rotational faulting, and chemical modification. Describing this family of “graphene materials” has been causing confusion in the Carbon journal and in the scientific literature as a whole. The international...
The phenalenyl derivative molecules, diphenyl derivatives of 1,2-bis-(phenalen-1-ylidene) ethene (Ph2-BPLE) and tetra t-butyl derivatives of s-indacenodiphenalene (TTB-IDPL), casted on a highly oriented pyrolytic graphite (HOPG) electrode, were characterized by using cyclic voltammetry (CV) in aqueous electrolyte solution. Stable and adsorption type redox peaks at the double-layer region of a HOPG...
Edges of finite size graphene, particularly nanographene, play an important role in giving unconventional electronic structure owing to the massless Dirac fermion features. This emerges as the creation of nonbonding edge state localized in the zigzag-shaped edges and electron wave interference in the armchair-shaped ones. We fabricated zigzag-edged and armchair-edged graphene nanoribbons, and investigated...
Ferromagnetic buckypaper of carbon nanotubes filled with Fe nanowires (Fe-CNT) was in situ synthesized without using any surfactants or acid treatment. As-synthesized Fe-CNT buckypaper shows strong anisotropic behavior, which can be attributed to the different response of Fe-nanowires inside carbon nanotubes with high aspect ratio in different applied magnetic field.
Nanoporous activated carbon fibers (ACFs) feature 3D disordered networks of nanographite domains that consist of stacks of 3–4 nanographene sheets each. At the peripheries of the nanographene sheets, the localized spins of a nonbonding edge state are created. The magnetic properties of the edge-state spins in ACFs are investigated in relation to the interaction with acid molecules adsorbed in the...
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