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Sunday, February 7
Monday, February 8
Tuesday, February 9
Wednesday, February 10
Seminar 2/10/2016 - Michael S. Arnold, University of Wisconsin-Madison: Breakthroughs in the Materials Science of Carbon Nanotubes and ....
Title: Breakthroughs in the Materials Science of Carbon Nanotubes and Graphene Nanoribbons and their Application in Transistors and Photovoltaics

Abstract: Carbon nanotubes and graphene nanoribbons are among the best charge transport materials ever discovered. The transformative potential of these materials in electronics and optoelectronics has already been demonstrated, on a single nanostructure level. However, implementing them in scaled, macroscopic devices involving many nanostructures has been much more difficult. My work addresses challenges – in controlling the growth, processing, ordering, and heterogeneity of carbon nanomaterials and in understanding phenomena beyond the scale of single nanostructures – that must be overcome to exploit carbon nanomaterials in (opto)electronics technology.

In this talk, I will present on two recent breakthroughs from my lab: (1) We have perfected the purification of semiconducting carbon nanotubes from heterogeneous mixtures of semiconducting and metallic nanotubes and pioneered a scalable approach for assembling them into aligned arrays. These advances have allowed us to create the highest performance carbon nanotube field effect transistors (FETs) ever demonstrated in terms of on-state conductance, rivaling or exceeding the conductance of Si and III-V FETs for the first time. (2) We have discovered a new CVD-based synthesis for high aspect-ratio, self-orienting, semiconducting graphene nanoribbons that are < 10 nm in width but 100’s of nanometers in length, with smooth armchair edges. The nanoribbons are grown from the bottom-up by exploiting a giant anisotropy in crystal growth rate on a Ge(001) catalyst substrate. This advance overcomes the shortcomings of top-down lithographically defined nanoribbons, which are limited by their rough and disordered edges, and provides a promising route for integrating semiconducting graphene directly onto a conventional semiconductor wafer platform.

Bio: Michael S. Arnold is currently an Associate Professor of Materials Science and Engineering at the University of Wisconsin-Madison. There, he has directed the Advanced Materials for Energy and Electronics Group since 2008. Prof. Arnold graduated summa cum laude from the University of Illinois at Urbana-Champaign with a Bachelor of Science degree in Electrical Engineering in 2001. He earned his Doctor of Philosophy degree in 2006 from Northwestern University in Materials Science and Engineering under Professors Mark Hersam and Sam Stupp. Prof. Arnold conducted post-doctoral research at the University of Michigan at Ann Arbor from 2006-2008 with Professor Stephen Forrest. Arnold has been a recipient of the National Science Foundation CAREER award (2014); the American Chemical Society Arthur K. Doolittle Award in Polymeric Materials Science and Engineering (2012); the Presidential Early Career Award for Scientists and Engineers (PECASE) – nominated by the U.S. Department of Defense, Army Research Office (2011); the U.S. Department of Energy (DOE) Early Career Research Award (2011); and a 3M Non-Tenured Faculty Award (2011, 2012, 2013).

All seminars are held on Wednesdays from 12:00 noon-1:00 p.m. in the Bowen Hall Auditorium Room 222. A light lunch is provided at 11:30 a.m. in the Bowen Hall Atrium immediately prior to the seminar.
Bowen Hall Auditorium  ·  12:00 p.m. 1:00 p.m.
Thursday, February 11
Friday, February 12
Saturday, February 13