Isotope effect on the thermal conductivity of boron nitride nanotubes.
We have measured the temperature-dependent thermal conductivity kappa(T) of individual multiwall boron nitride nanotubes using a microfabricated test fixture that allows direct transmission electron microscopy characterization of the tube being measured. kappa(T) is exceptionally sensitive to isotopic substitution, with a 50% enhancement in kappa(T) resulting for boron nitride nanotubes with 99.5% 11B. For isotopically pure boron nitride nanotubes, kappa rivals that of carbon nanotubes of similar diameter.
Chang
C W
CW
Department of Physics, University of California, Berkeley, California 94720, USA.
Fennimore
A M
AM
Afanasiev
A
A
Okawa
D
D
Ikuno
T
T
Garcia
H
H
Li
Deyu
D
Majumdar
A
A
Zettl
A
A