FIB and CVD Fabrication of Carbon Nanostructures on Diamond and Quartz Substrates
Abstract
Electronic carbon nanostructures have been fabricated on diamond substrates by focused ion beam (FIB) irradiation. Fabrication of planar nanowire/nanodot structures at a scale below 10 nm (e.g. all-carbon single electron transistor with island size of 7 nm) has been shown. FIB-written carbon nanostructures may reveal non-linear conductivity, current injection trough insulating diamond, bistability of current flow, and coulomb blockade at room temperature. Also we developed methods of fabrication of large uniform areas of amorphous carbon and/or graphene films on diamond and quartz substrates using combination of graphitization/CVD deposition/plasma etching processes. Arrays of carbon nanowires/nanodots, amorphous carbon films on diamond and graphene films on quartz have been shown to possess remarkable electronic properties and selective chemical sensitivity. A model of continuum carbon phase transitions has been developed to explain the experimental data. The problem of two-dimensional (2D) nucleation has been approached theoretically using the concept of escape time (phase-transition time) and direct computer simulations. It is shown that the transition state of graphite/diamond phase system gains thermodynamic stability in a closed nano-volume and, in case of 2D nucleation, there is a critical thickness above which the growing layer manifests the stable phase.
Document Details
- Document Type
- Technical Report
- Publication Date
- Mar 29, 2011
- Accession Number
- ADA544759
Entities
People
- Alexander Umantsev
- Alexandra Bergman
- Alexandre M. Zaitsev
- Anshel A. Gorokhovsky
- Searhei Samsonau
- Vivek Kumar
- Yuri A. Dziashko
- Zinovy Akkerman
Organizations
- City University of New York