Torsional Oscillators

1
Torsional Oscillators

• Torsional Oscillators for Fundamental properties
  and as devices
• Torsion (shear_) moduli, Internal Friction (Q)
• Transport vs. Torsional Angle within nantube
• Transport across CNT interfaces

G (shear modulus)? GCNT 10 GSi ?
2
Torsional Oscillators

• Ebeam Lithography on placed/manipulated CNT
• RT/ Comp Sci.

Double Paddles released
Single Paddles released
3
Torsional Oscillators

• Ebeam Lithography on placed/manipulated CNT
• RT/ Comp Sci.

Torsional k 10-15 Nm Spring Constant .02
Nm Frequency 1 100MHz
Paddles Au 500nm x 750 nm (sized for optical
characterization) CNT torsional bars 5-30 nm
diameter, 200-700nm long
4
Torsional Oscillators

• Ebeam Lithography on placed/manipulated CNT
• RT/ Comp Sci.
• Place AFM tip on Paddle
• Move paddles and Acquire force curves