Bioinspired Confined Anisotropic Thermally Conductive MXene Film for Efficient Thermal Management

ABSTRACT Anisotropic thermally conductive films (TCFs) capable of achieving efficient intra‐plane heat dissipation while suppressing inter‐plane thermal transfer have become essential components for next‐generation electronics thermal management. Inspired by nacre, we demonstrated an ultrahigh anisotropic thermally conductive MXene (Ti 3 C 2 T x ) films through a bioinspired confined strategy. The layer‐by‐layer blade coating is applied to prepare confined highly oriented layered structure of MXene and montmorillonite (MMT) nanosheets by interfacial bridging. The resultant MXene films exhibit exceptional intra‐plane thermal conductivity (63.4 W m −1 K −1 ) while creating substantial phonon scattering interfaces to minimize inter‐plane thermal conductivity (0.09 W m −1 K −1 ), thereby providing a thermal anisotropy factor that reaches 707. The resultant MXene films have superior cooling efficiency compared to commercial TCFs as thermal spreaders for next‐generation electronics. Our strategy provides an avenue for assembling other two‐dimensional (2D) nanosheets into high‐performance functional film.