Isotope Effect on the Thermal Conductivity of Boron Nitride Nanotubes
Chih‐Wei Chang(University of California, Berkeley), Adam Fennimore(University of California, Berkeley), A. D. Afanasiev(University of California, Berkeley), David Okawa(University of California, Berkeley), Takashi Ikuno(University of California, Berkeley), H. Garcia(University of California, Berkeley), Deyu Li(Vanderbilt University), Arun Majumdar(University of California, Berkeley), Alex Zettl(University of California, Berkeley)
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Abstract
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.
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