As the demand for advanced thermal management materials continues to grow, high thermal conductivity materials, especially those with superior chemical stability and mechanical strength, are increasingly sought after from both theoretical and applied perspectives. Two-dimensional transition metal carbides (MXenes) meet these criteria and have been theoretically predicted to possess high thermal conductivity. However, experimental validation of their intrinsic transport properties—particularly the effects of surface terminations, lateral size, and thickness—remains limited due to the difficulty of obtaining clean, large-area samples. Here, we experimentally investigate single-flake Ti3C2Tx with thicknesses ranging from ~9 to 45 nm to reveal its thickness-dependent thermal behavior. Using the energy transport state-resolved Raman technique, we measured thermal conductivities ranging from 30.6 W m−1 K−1 to 105 W m−1 K−1, consistent with theoretical predictions. These results offer direct insight into intrinsic thermal transport in MXenes and underscore their promise for efficient thermal management applications. Experimental validation of the intrinsic transport properties of 2D MXenes is challenging due to difficulty in obtaining clean, large-area samples. This paper investigates single-flake Ti3C2Tx with thicknesses ranging from ~9 to 45 nm to reveal its thickness-dependent thermal behavior.
Liu et al. (Thu,) studied this question.