Showing papers on "Graphene published in 1992"

Handbook of carbon, graphite, diamond, and fullerenes

Abstract: The performance of a single-crystal diamond detector, grown by chemical vapour deposition, as an energy (2) Pierson H. O., Handbook of Carbon, Graphite. Diamonds and Fullerenes: Processing, Properties. Applications. Handbook of carbon, graphite, diamond and fullerenes 1993 Pierson.pdf 4.72 MB Handbook of preparative inorganic chemistry 1963 Vol 1,2 Brauer.pdf. but in other areas, less-ordered graphitic or amorphous carbon shells were also Pierson, H. O. in Handbook of Carbon, Graphite, Diamond and Fullerenes:. At high temperature, Mg can reduce not only carbon in the oxidation state of +4 in Pierson, H. O. Handbook of carbon, graphite, diamonds and fullerenes:. nanotoxicity of carbon nanotubes and graphene in biomedicine. Pierson, H.O. Handbook of Carbon, Graphite, Diamond, and Fullerenes: Properties. Section 4 of the article is devoted towards discussing the role of carbon and its (7) H O Pierson, Handbook of carbon, graphite, diamonds and fullerenes:. The main forms are diamond and graphite, and they exhibit markedly di erent Books Handbook of Carbon, Graphite, Diamond and Fullerenes Properties. Four different forms of carbon namely, Graphite, Activated H. O. Pierson, Handbook of Carbon, Graphite, Diamonds and Fullerenes: Processing, Properties. The growth of multi-walled carbon nanotube (MWCNT) and carbon nano (13) H. O. Pierson, Handbook of Carbon, Graphite, Diamond and Fullerenes:.

Tight-binding density of electronic states of pregraphitic carbon.

Abstract: The density of states of pregraphitic (disordered) carbon has been investigated using a tight-binding description of the electronic structure. The tight-binding Hamiltonian has been diagonalized using the recursion method for different stackings of graphene layers. The density of states of pi-electrons in a disordered stacking usually called "turbostratic" graphite and the resulting behavior near the Fermi level are compared to the results obtained for the Bernal structure, for the rhombohedral structure, and for the simple hexagonal structure.

New evidence for supported metals in the reaction of KC8 with metal chlorides

Abstract: The evolution of the reaction between the binary graphitide KC8 and CoCl2 dissolved in anhydrous tetrahydrofuran (THF) has been investigated by in situ x-ray diffraction (XRD). During the reaction and whatever the host graphite (powder or HOPG), the first stage graphite intercalation compounds K(THF)2.5C24 and K(THF)1.7C24 are first formed and then transformed into higher stages. Finally the matrix is exfoliated and the phases identified are graphite, metallic cobalt, and KCl. Analyses by Scanning Electron Microscopy (SEM) and Energy Dispersive X-ray (EDX) clearly show that the products are mainly located at the edge planes of the graphite, indicating that the electronic exchange occurs at the edge of the graphene layers. It is now clear that graphite-cobalt intercalation compounds cannot be obtained by this method.

Electron microscopy study of graphitic particles produced in arc-discharge experiments

Abstract: We present a high resolution transmission electron microscopy investigation of carbon soot deposited on the surface of contact between carbon electrodes; the high spatial resolution of this technique being an especially powerful tool to directly visualize the atomic structures of small particles. We find a wide variety of shapes and structures, among which, most strikingly, concentric-shelled particles and coaxial graphene tubes. These tubes may present lengths longer than one micron, and diameters as small as one nanometer. Strong electron bombardment of the soot generates, as a final result, concentric-shelled, graphitic particles, with a remarkable spherical shape.