These systems have been investigated experimentally and theoretically with a view towards application in transistor or waveguiding devices. Periodically perforated graphene sheets (antidot lattices) are predicted to have such a gap. Nanostructuring of graphene is in part motivated by the requirement to open a gap in the electronic band structure of graphene. He joined University of Bergen in May 2008 as PhD research fellow and his research area includes synthesis of carbon nanotubes and surface functionalization of nano carbon for fuel cell applications and has expertise in the operations of thin film systems (thermal evaporation, sputtering, chemical vapor deposition and electron beam evaporation) and different material characterization methods includes Scanning electron microscope, Transmission electron microscope, High-resolution transmission electron microscope, Particle size analyzer, Zeta potential measurements, surface area analyzer, Raman and UV/IR Spectroscopy, Electrochemical impedance spectroscopy. degree in Applied Sciences from Coimbatore Institute of Technology, India (2004), MSc degree in Materials Science from PSG College of Technology (2006), India. He is primarily interested in the synthesis and characterization of nanomaterials, thin films. Vijayshankar Asokan is currently a PhD research student at University of Bergen, Norway. Electron microscopes (Scanning, transmission and high-resolution transmission), Raman spectroscopy, Thermal gravimetry analysis, X-ray diffraction methods are used for the characterization of these samples. Process of transformation of CB particles is studied with respect to temperature, inert gas, metal catalysts (Ni, Fe) and their weight ratios with respect to CB taken during experiment. Further, this works studied the possibilities of transformation CB into a nano-onions and nanofibers using microwave energy with and without use of any metal catalysts respectively. In this work, an easy, economical and single-step process for the transformation of CB into a large quantities of metal-encapsulated multi-walled carbon nanobeads (MWNB) and multi-walled carbon nanotubes (MWNT) is carried out. The degree of transformation and morphology of resulting nanostructure depends on many factors which this project takes into consideration and studied. Many bent and faceted layer planes and few closed-shell structures could be obtained when CB was treated at high temperature and however carbon undergoes structural transformation when it comes in contact with metal catalysts at high temperature. It lies in the category of non-graphitizable carbon. B 89, 081405(R), 2014.ĬB is a well-known type of amorphous carbon which exists in the form of aggregated spheres. Brandbyge "Efficient calculation of inelastic vibration signals in electron transport: Beyond the wide-band approximation", Phys. We use non-equilibrium Greens functions in combination with DFT calculations to calculate all parameters from first principles. On this poster we present the modeling of IETS signals for GNRs with a selection of relevant defects. This method also enable studies of IETS on gated graphene. Contrary to metallic contacts, for the carbon systems the electronic states vary on the energy scale of the vibrational frequencies necessitating calculations which go beyond the otherwise successful LOE-WBA. In order to interpret experiments, theoretical modelling of the inelastic signals, as a consequence of electron–phonon scattering, in the electronic current is of interest. Inelastic electron tunneling spectroscopy(IETS), serves as a way of preforming nondestructive characterization yielding vibrational fingerprints of a range of defects. However, characterization of edge passivation or structural/chemical defects is challenging especially after device fabrication.
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Graphene Nano-ribbons(GNR) are a potential candidate for molecular wires with tailored conductance properties.