BIOMEDICAL ENGINEERING CAPSTONE DESIGN

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Carbon Nanotubes
What are they? What are some useful
properties? How are they made? What are some
potential applications?
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Carbon Nanotubes
What are they? CNs are an extended, long form
(i.e, slender tubes), of the now famous C60
fullerene buckyball essentially CNs are
single molecules comprised of rolled graphite
sheets capped at each end
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Carbon Nanotubes

• What are some useful properties?
• CNs have extraordinary resilience and strength
• and other unusual properties gt
• they can abruptly and reversibly snap from
  one shape to another under load
• they can be formed into very strong ropes
• they exhibit electrical conductivity in a
  quantizedfashion that has led to research on
  
• tiny nanowires and nanoscale transistors

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Carbon Nanotubes
How are they made?
V e r y c a r e f u l l y !!!
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Carbon Nanotubes
What are some potential applications? very
strong wires novel composites microelectronics
(superior heat sinks) open-ended nanostraws
used for probing of cells novel probes
(NSOM) pure carbon metal-semiconductor
heterojunctions quantum wires gt core technology
for single- electron resistor components for
sub-MEMS systems
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Carbon Nanotubes
All CN applications face a common problem gt how
to properly implant a CN with desirable
properties into a large device or circuit
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Carbon Nanotubes
Three basic types of nanotubes possible armcha
ir zigzag chiral
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Carbon Nanotubes
CN Synthesis Method 1- laser vaporization of a
carbon target in a furnace _at_ 1200 0C A
cobalt -nickel catalyst facilitates growth of
CN (helps prevent premature capping of the
ends) during synthesis two pulsed lasers
(fired 50 ns apart) can help maintain CN growth
conditions over a larger volume and longer time
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Carbon Nanotubes
CN Synthesis Method 2 - alternative versions
which uses a carbon arc procedure, ionized
carbon plasma, and joule heating
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BME 417 - Biomedical Engineering Design
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Research Methods
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