ENGRI111_29_nanotubes2 - Carbon Nanotubes Composites B, 33,...

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Carbon Nanotubes Carbon Nanotubes Composites B, 33 , 263, 2002 Scientific American, 62, Dec. 2000
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Band Structure Band Structure Semimetal Band gap in nanotubes varies with circumference small diameter: fewer states: further apart: larger Eg Additional effects because of tube shape ~ 1/3 of nanotubes have the right diameter and twist
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Electrical Properties Electrical Properties Metallic If 2n + m = 3q, q is an integer n,m refer to diameter and folding direction Metallic if n=m Semiconductor
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Graphene: Folding Graphene: Folding O B A B’ n determines the tube diameter m determines twisting electrical properties
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zigzag armchair chiral
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Gallery Gallery
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Applications Applications Plastic parts containing nanotubes paint better FET Field emitters Diodes
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Nanotube Channel in FET Nanotube Channel in FET research.ibm.com Fast switching (Clock speeds: 1 THz) Less power Traditional lithography for electrodes AFM to locate and position CNT Long way from microchip fabrication
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This note was uploaded on 02/28/2008 for the course ENGRI 1110 taught by Professor Giannelis during the Fall '07 term at Cornell University (Engineering School).

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ENGRI111_29_nanotubes2 - Carbon Nanotubes Composites B, 33,...

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