Flexural vibration spectra of carbon nanotubes measured using laser Doppler vibrometry

Laura Biedermann, Purdue University - Main Campus
Ryan C. Tung, Purdue University - Main Campus
Arvind Raman, Birck Nanotechnology Center, Purdue University
R. Reifenberger, Birck Nanotechnology Center, Purdue University

Date of this Version


This document has been peer-reviewed.



Laser Doppler vibrometry is used to measure the thermal vibration spectra of individual multiwalled carbon nanotubes (MWNTs) under ambient conditions. Since the entire vibration spectrum is measured with high frequency resolution, the resonant frequencies and quality factors of the MWNTs are accurately determined, allowing for estimates of their elastic moduli. Because the diameters of the MWNTs studied are smaller than the wavelength of the vibrometer's laser, Mie scattering is used to estimate values for the smallest diameter nanotube or nanowire whose vibration can be measured in this way.


Nanoscience and Nanotechnology