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A. A. Green and M. C. Hersam , Advanced Materials , 23 , 2185 (2011).

Single- Chirality Single-Walled Carbon Nanotubes Mark C. Hersam , Northwestern University, DMR 1006391.

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A. A. Green and M. C. Hersam , Advanced Materials , 23 , 2185 (2011).

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  1. Single-Chirality Single-Walled Carbon NanotubesMark C. Hersam, Northwestern University, DMR 1006391 Current synthetic methods for single-walled carbon nanotubes (SWCNTs) lack control over critical structural parameters including diameter and chirality. Since this structural polydispersity implies inhomogeneity in electronic properties, devices and circuits based on thin-films of as-produced SWCNTs suffer from sub-optimal and irreproducible performance. In this work, orthogonal iterative density gradient ultracentrifugation was employed to sort SWCNTs first by diameter and then by electronic properties, ultimately yielding samples that were highly enriched in one chirality. These single-chirality SWCNTs were subsequently used to fabricate field-effect transistors with unprecedented device characteristics. Schematic representation of a field-effect transistor fabricated from a network of single-chirality single-walled carbon nanotubes. A. A. Green and M. C. Hersam, Advanced Materials, 23, 2185 (2011).

  2. Carbon Nanomaterials for Space Applications Mark C. Hersam, Northwestern University, DMR 1006391 Carbon nanomaterials, including carbon nanotubes and graphene, are believed to be strong candidate materials for space applications due to their low interaction cross-sections with ionizing radiation. In an industrial collaboration with Dr. Liam Pingree at The Boeing Company, thin films of carbon nanotubes and graphene were delivered to the International Space Station (ISS) for radiation testing by the final voyage of the Space Shuttle Endeavour in May, 2011. An identical set of terrestrial control samples are being stored in the Hersam Laboratory at Northwestern University for comparative evaluation once the ISS samples return to Earth. Successful verification of radiation hardness will enable the development of satellite electronics and/or solar cells based on carbon nanotubes and graphene. Graduate student LailaJaber-Ansari performs charge transport measurements on thin films of carbon nanotubes and graphene.

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