Browse/search for people

Publication - Dr Chao Yuan

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

    Citation

    Yuan, C, Li, J, Lindsay, L, Cherns, D, Pomeroy, J, Liu, S, Edgar, JH & Kuball, MHH, 2019, ‘Modulating the thermal conductivity in hexagonal boron nitride via controlled boron isotope concentration’. Communications Physics, vol 2.

    Abstract

    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 W 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.

    Full details in the University publications repository