graphene – Page 12 – TechConnect Briefs

Graphene and polymer composite using easy soluble expanded graphite

Lee J-H., Sungkyunkwan University, KR

ESEG was prepared from a fluorinated graphite intercalation compound (FGIC) - C2F∙nClF3 containing inorganic volatile intercalating agent ClF3. The severe expanded state, together with high specific surface area of the ESEG can give us essential [...]

Introduction to Raman Spectroscopy as a Characterization Tool for Carbon Nanotubes, Graphene, and other Carbon Nanostructures

Hodkiewicz J., Wall M., Thermo Fisher Scientific, US

While there have been many publications produced in which Raman spectroscopy has been used to characterize various aspects of carbon nanostructures, there have been few works published which provide an overview of what the technique [...]

Ab initio investigation of Graphene Based Systems

Virka N.S., Harrisonb N.M., Montanaric B., Imperial College London, UK

First-principles calculations employing the hybrid exchange functional B3LYP are used to determine the structural parameters, electronic structure and associated properties of a graphene sheet, graphane chair and graphane boat confirmations. Graphane is found to have [...]

Tuning the electronic and chemical surface properties of graphane combining alkali deposition and low-energy ion irradiation

Heim B., Allain J.P., Zemlyanov D., Taylor C.N., El-Atwani O., Purdue University, US

The presence of defects in graphene due to thin-film processing can lead to alterations of its electronic properties. Tuning of graphene’s electronic properties could be achieved through control of thermal deposition of alkaline dopants (e.g. [...]

Spin Dependent Transport in Carbon Nanostructures

Harrison N.M., Montanari B., Imperial College London, UK

A theoretical investigation of the electronic and magnetic structure in carbon nanoribbons, defective graphene and carbon peapod structures. The critical importance of electron correlation in the emergent behaviour will be demonstrated for; the generation of [...]

Advances in Helium Ion Microscopy for High Resolution Imaging and Material Modification

Thompson W., Notte J., Scipioni L., Ananth M., Stern L., Sijbrandij S., Sanford C., Carl Zeiss SMT, US

The helium ion microscope routinely obtains sub-nanometer resolution on uncoated soft materials with a high signal to damage ratio. In addition to its high resolution imaging capability, the microscope has been successful at sub-nanometer film [...]

Characterization of graphene segregated on Ni

Yu Q., Lian J., Chen Y-P, Li H., Lian J., Pei S-S, University of Houston, US

We report a surface segregation approach to synthesize high quality graphenes on Ni under ambient pressure. Graphenes were segregated from Ni surfaces by carbon dissolving at high temperature and cooling down with various cooling rates. [...]

OH Radical Oxidation of Ethylene Adsorbed on Graphene: A Quantum Chemistry Study

Iuga C., Vivier-Bunge A., Universidad Autónoma Metropolitana, MX

The functionalization of carbon based nanomaterials could have applications in atmospheric chemistry and contaminants removal. In this work, a quantum chemistry and computational kinetics study has been performed on the OH radical addition to ethylene [...]

Electronic Properties of Gaphitic Surfaces with Adsorbed Aromatic Amino Acids

Roman C., Ciontu F., Courtois B., Tima Laboratory, FR

The electronic properties of aromatic amino acids physisorbed on graphene are investigated in view of establishing if carbon nanotube transconductance sensors can respond to this type of chemical stimuli. Several conclusions are drawn regarding both [...]