Wieland Reis

Wieland Reis

06216092281
01624277179

extern
68159 Mannheim

More information

Membership Number

0030

Status

associated

Course of Studies

Materialwissenschaften

Department

Molecular Nanostructures

Head

Prof. Ralph Krupke

Beginning of PhD Thesis

01.07.2013

Topic of Thesis

Separation of carbon nanotubes and application in field-effect transistors

Abstract

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.

Methods

DGU, UV-Vis-NIR, Raman, AFM, SEM,

Project Funding

intern BASF

International Conferences

none so far

Major Research Facilities

BASF

Stay Abroad

not clarified

Publications

none as first author so far

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