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Variation of Radial Elasticity in Multiwalled Carbon Nanotubes
 

Summary: Variation of Radial Elasticity in
Multiwalled Carbon Nanotubes
Lata Muthaswami, Yuegui Zheng, Robert Vajtai, G. Shehkawat,,|
Pulickel Ajayan, and Robert E. Geer*,
College of Nanoscale Science and Engineering, UniVersity at Albany,
Albany, New York 12203, and Rensselaer Nanotechnology Center, Department of
Materials Science and Engineering, Rensselaer Polytechnic Institute,
Troy, New York 12180
Received August 10, 2007; Revised Manuscript Received October 31, 2007
ABSTRACT
Correlations between the local diameter and local radial elastic modulus in multiwalled carbon nanotubes (MWNTs) were investigated via
ultrasonic force microscopy. Spatial cross-correlation analysis showed that local radial modulus variations were inversely correlated with
local diameter gradients ("bamboo" structures) in MWNTs grown via chemical vapor deposition (CVD). In contrast, uniform MWNTs grown via
arc discharge exhibited no such correlation, indicating that reductions of elastic modulus previously reported for CVD-grown MWNTs originated
from increased defect density associated with local increases in diameter.
Since their discovery1
carbon single-walled nanotubes
(SWNTs) and multiwalled nanotubes (MWNTs) have at-
tracted enormous scientific interest due to their unique
mechanical, electrical, and thermal properties. Theoretical

  

Source: Ajayan, Pulickel M. - Department of Mechanical Engineering and Materials Science, Rice University

 

Collections: Materials Science