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Title: Modulating the thermal conductivity in hexagonal boron nitride via controlled boron isotope concentration

Journal Article · · Communications Physics

Hexagonal boron nitride (h-BN) has been predicted to exhibit an in-plane thermal conductivity as high as ~ 550 W m–1 K–1 at room temperature, making it a promising thermal management material. However, current experimental results (220–420 m–1 K–1) have been well below the prediction. Here, we report on the modulation of h-BN thermal conductivity by controlling the B isotope concentration. For monoisotopic 10B h-BN, an in-plane thermal conductivity as high as 585 W m–1 K–1 is measured at room temperature, ~ 80% higher than that of h-BN with a disordered isotope concentration (52%:48% mixture of 10B and 11B). The temperature-dependent thermal conductivities of monoisotopic h-BN agree well with first principles calculations including only intrinsic phonon-phonon scattering. Our results illustrate the potential to achieve high thermal conductivity in h-BN and control its thermal conductivity, opening avenues for the wide application of h-BN as a next-generation thin-film material for thermal management, metamaterials and metadevices.

Research Organization:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
1511942
Journal Information:
Communications Physics, Vol. 2, Issue 1; ISSN 2399-3650
Publisher:
Springer NatureCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 79 works
Citation information provided by
Web of Science

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Cited By (5)

Spherical filler‐promoting thermally conductive pathway in graphite‐containing polymer composites for high heat radiation journal January 2020
Photonics with hexagonal boron nitride journal July 2019
Nanosecond transient thermoreflectance method for characterizing anisotropic thermal conductivity journal November 2019
Simultaneous characterization of cross- and in-plane thermal transport in insulator patterned by directionally aligned nano-channels journal January 2020
Ultrahigh thermal conductivity in isotope-enriched cubic boron nitride journal January 2020

Figures / Tables (3)


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