Transport Properties of Carbon Nanotubes

The exceptional electrical, thermal and mechanical properties of carbon nanotubes (CNTs) can be used for many applications. The electrical transport properties enables applications in transistors, in  spin electronic devices or in molecular electronics. The high conductivity and aspect ratio of the CNTs were utilized in polymer carbon nanotubes composites for antistatic coatings and electromagnetic shielding materials. The electrical transport properties of multiwalled carbon nanotubes (MWCNT) depend on the chemical vapour deposition method (CVD), which has been used to synthesized the CNT.

We contacted individual MWCNT with different methods and materials. The transport properties were studied depending on the preparation process, the filling, the structural configuration and the contact materials.

Methods

• Fabrication of contact pad arrays on silicon wafers with Photo- or Laser-lithography

• Transfer of the CNT using dielectrophoretic deposition or FIB techniques
• E-beam-lithography and lift-off-techniques to realize the contacts on the individual MWCNT
• TEM, REM, AFM for the structure characterization
• Electrical transport measurements at 50mK <T< 300K in magnetic fields up to 10T