| Nanotubes and nanowires are important materials for studies in nanometer scale. To study the electrical properties and characterize nanotubes and nanowires, it is necessary to make electrical contacts to these devices. Optical lithography alone cannot be used, as the resolution needed for making contacts to nanotubes/nanowires is beyond what optical lithography can provide. Electron Beam Lithography offers a versatile method for making contacts to nanotubes/nanowires. This thesis provides an insight into the fabrication of nanotubes/nanowire devices by a mixed lithography technique.; Experiments were done on the influence of bias and temperature on the tunneling conductance of multiwall nanotubes. Previous work in this area explains the tunneling conductance of MWNT by treating the nanotube as a Luttinger Liquid. However, this does not fully explain the results that we have observed. A plausible theoretical explanation that is in good agreement with our results is given.; We did the optical and electrical characterization of Gallium Arsenide nanowires. The Photoconductivity measurements show an effect that is significantly different from that of bulk Gallium Arsenide. |
