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F. Hennrich
Dr. Frank Hennrich
Project Leader
frank hennrichNrt1∂kit edu

Synthesis and Separation of Carbon Nanotubes


Our research is focused on synthesis (Chemical Vapor Decomposition (CVD), Pulse Laser Vaporization) and sorting (by length, diameter, (n, m)) of Single Wall Carbon Nanotubes (SWNTs). SWNTs exhibit outstanding physical and chemical properties, making them excellent candidate in a wide range of applications including electronics, photonic, sensors and energy conversion. Up to now, SWNT production processes are not selective in producing only one (n, m)-species. Their applications are deeply correlated to this issue as device performances are strongly affected by SWNTs purity. Therefore post-processing approach including sorting of SWNTs is compulsory for their integration as active component in devices. For sorting SWNTs e. g. polymer wrapping is a non-destructive selective method using non-covalent and specific interactions that allows an efficient and scalable process for sorting SWNTs (n, m)-species.

Separation of Double-Walled Carbon Nanotubes by Size Exclusion Column Chromatography


We demonstrate the separation of raw carbon nanotube material into fractions of double-walled (DWCNTs) and single-walled carbon nanotubes (SWCNTs). Our method utilizes size exclusion chromatography with Sephacryl gel S-200 and yielded two distinct fractions of single- and double-walled nanotubes with average diameters of 0.93 ± 0.03 and 1.64 ± 0.15 nm, respectively. The presented technique is easily scalable and offers an alternative to traditional density gradient ultracentrifugation methods.  ACS Nano 8, 6756 (2014).