The performance of carbon nanotube field-effect transistors is analyzed, using the nonequilibrium Green’s function formalism. The role of the inelastic electron-phonon interaction on the both on-current and gate delay time of these devices is studied. For the calculation of the gate delay time the quasi-static approximation is assumed. The results confirm experimental data of carbon nanotube tr...

Electrical properties of carbon nanotube depend strongly on its lattice structure, which is specified by the chiral and translational vectors. Toroidal shape of nanotube admits various twisted structures along the axis direction. Kinematics for the conducting electrons, and the persistent currents in toroidal carbon nanotube are investigated theoretically. We show that waveform of the persisten...

We use numerical simulations to investigate the effect of electrostatics on the source and drain contacts of carbon nanotube field‐effect transistors. We find that unscreened charge on the nanotube at the contact‐channel interface leads to a potential barrier that can significantly hamper transport through the device. This effect is largest for intermediate gate voltages and for contacts near t...

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Single-walled carbon nanotubes are uniquely identified by a pair of chirality indices (n,m), which dictate the physical structures and electronic properties of each species. Carbon nanotube research is currently facing two outstanding challenges: achieving chirality-controlled growth and understanding chirality-dependent device physics. Addressing these challenges requires, respectively, high-t...

Molecular dynamics simulations based on a novel polarizable nanotube model were performed to study the dynamics in translocation of a single-stranded deoxyribonucleic acid oligonucleotide through a polarized carbon nanotube membrane by an applied electric field. The study revealed a nonlinear dependence of translocation velocity and an inverse quadratic dependence of translocation time on the e...

Title of Document: DEVELOPMENT OF CARBON NANOTUBE FIELD-EFFECT TRANSISTOR ARRAYS FOR DETECTION OF HER2 OVEREXPRESSION IN BREAST CANCER Konrad Hsu Aschenbach, Ph.D., 2011 Directed By: Professor Romel D. Gomez, Department of Electrical and Computer Engineering We developed a carbon nanotube biosensor platform that was deployed at the National Cancer Institute and successfully detected the HER2 on...

The field emission of individual multiwall carbon nanotubes grown by chemical vapor deposition was measured in a scanning electron microscope. By using a sharp anode, we were able to select one nanotube for measurements in carefully controlled conditions. Single nanotubes follow the Fowler-Nordheim law, and the dependence of the field enhancement with interelectrode distance and nanotube radius...

In-situ three terminal electron field emission characterisation of an isolated multiwalled carbon nanotube has been performed. Both anode and gate electrodes are attached to high precision piezo-drivers allowing for the characterisation of single emitters. All measurements are performed in a scanning electron microscope allowing accurate knowledge of the local environment of the nanotube to be ...

Field emission of electrons from individually mounted carbon nanotubes has been found to be dramatically enhanced when the nanotube tips are opened by laser evaporation or oxidative etching. Emission currents of 0.1 to 1 microampere were readily obtained at room temperature with bias voltages of less than 80 volts. The emitting structures are concluded to be linear chains of carbon atoms, Cn, (...