Course of Studies
Prof. Ralph Krupke
Beginning of PhD Thesis
Topic of Thesis
Separation of carbon nanotubes and application in field-effect transistors
Semiconducting single-walled carbon nanotubes (SWCNTs) are attracting tremendous interest regarding their applications in nanoelectronics due to their outstanding electronic properties. Carbon nanotubes can exhibit either a semiconducting or metallic behavior based on their geometrical structure. Since momentary available production processes cannot selectively produce semiconducting SWCNTs, an eff ective way for the separation of semiconducting from metallic ones is needed. Density gradient ultracentrifugation is a separation based on chemically enhanced buoyant density di fferences.
The focus of this work is the creation of tailored density gradients for the separation of heterogeneous HiPco SWCNTs. isolated bands of nanotubes of nearly equal densities are extracted from the centrifuged tubes and characterized.
Enhanced semiconducting behavior, regarding the ON/OFF ratio and field-e ffect mobility, similar to benchmark samples are supposed to be observed for our purifi ed materials.
DGU, UV-Vis-NIR, Raman, AFM, SEM,
none so far
Major Research Facilities
none as first author so far