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With the high integration and miniaturization of modern electronic devices, the heat dissipation of these devices has gradually become a key factor limiting their performance development. Today, with the discovery of two-dimensional nanomaterials such as graphene, two-dimensional materials with ultra-high in-plane thermal conductivity can be used as fillers to improve thermal conductivity. However, when a two-dimensional nanomaterial is used as a thermally conductive filler, its dispersibility in the material must also be considered. In 2011, a new two-dimensional transition metal compound (MXene) was discovered for the first time. Researchers found that MXene has excellent electrical, thermal, photothermal, and energy storage properties. MXene is also a potentially ideal thermally conductive filler because of its good dispersibility in polar solvents and ease of mixing and processing.

Recently, under the guidance of Professor Wu Peiyi, a master student of Fudan University, Huang Xianwu prepared a composite film with both high in-plane thermal conductivity and electrical insulation properties. As shown in Figure 1, by adding a small amount of MXene nanosheets, the in-plane thermal conductivity of the boron nitride-based composite film can reach a maximum of 52.4 W m-1 K-1, while still maintaining the electrical insulation resistivity. The addition also greatly improved the mechanical properties of the membrane.

Figure 1 Thermal conductivity, resistivity and mechanical properties of MXene-BNNS composite film

Through scanning electron microscope observation, as shown in Figure 2, the improvement in in-plane thermal conductivity can be attributed to two aspects: 1. MXene nanosheets serve as a thermally conductive "bridge" to connect adjacent boron nitride nanosheets, filling the gap between nanosheets Voids, thereby reducing the conduction thermal resistance between the interfaces; 2. MXene surface has a wealth of negatively charged functional groups, and through electrostatic repulsion, the boron nitride nanosheets can be better dispersed in water, so MXene also improves Effect of in-plane orientation of boron nitride nanosheets.

Fig.2 FESEM and EDX spectra of MXene-BNNS composite film

This work not only expands the application of MXene, but also provides inspiration for the design of highly thermally conductive composite films.

Source-WeChat public: MCF Materials Chemistry Frontiers