ECE474S11_Lec07_26Jan11 - ECE 474 Principles of Electronic...

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ECE 474: Principles of Electronic Devices Prof. Virginia Ayres Electrical & Computer Engineering Michigan State University [email protected]
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V.M. Ayres, ECE474, Spring 2011 Lecture 07: Lectures: Hexagonal nanosystems: graphene and carbon nanotubes ¾ Introduction to graphene and CNTs ¾ The Basis Vectors: a 1 and a 2 ¾ Nearest neighbor distances ¾ The Chiral Vector: C h ¾ The CNT diameter d t ¾ The Translation Vector: T ¾ The Unit Cell of a CNT ¾ Number of hexagons N ¾ Number of atoms N/2 ( π electrons) ¾ Areal Density Examples of each Quantify physical structures of crystal systems that are important for devices:
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V.M. Ayres, ECE474, Spring 2011 Lecture 07: Lectures: Hexagonal nanosystems: graphene and carbon nanotubes ¾ Introduction to graphene and CNTs ¾ The Basis Vectors: a 1 and a 2 ¾ Nearest neighbor distances ¾ The Chiral Vector: C h ¾ The CNT diameter d t ¾ The Translation Vector: T ¾ The Unit Cell of a CNT ¾ Number of hexagons N ¾ Number of atoms N/2 ( π electrons) ¾ Areal Density Examples of each Quantify physical structures of crystal systems that are important for devices:
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V.M. Ayres, ECE474, Spring 2011 Introduction: Graphene: http://www.google.com/imgres?imgurl=http://math.uc r.edu/home/baez/graphene.jpg
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V.M. Ayres, ECE474, Spring 2011 Introduction: Carbon Nanotubes: A single wall Carbon Nanotube is a single graphene sheet wrapped into a cylinder. The endcaps are half-buckyballs. Note: different possible wrappings.
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