The rapid development of electronic equipment has led to stricter requirements for thermal management materials. Traditional polymeric composites cannot satisfy these demands due to their low thermal conductivity (TC). The rapid development of two-dimensional (2D) nanomaterials with high intrinsic TC provides us with a new avenue to prepare highly thermally conductive composites. In our work, small amounts of exfoliated Ti₃C₂T_x nanosheets were chosen to cooperate with boron nitride nanosheets to fabricate hierarchically layered composite films by vacuum-assisted filtration. We found that small amounts of Ti₃C₂T_x reform the in-plane TC of the composite film. Our experimental results show that when the mass content of Ti₃C₂T_x in the hybrid fillers is 5%, this composite film possesses an exceptionally high in-plane thermal conductivity up to 52.4 W m⁻¹ K⁻¹ and still maintains the favorable electrical insulating property. Besides, more interestingly, the small addition of Ti₃C₂T_x can simultaneously improve the tensile strength and the fracture strain of the film. We attribute the enhancement of thermal-conducting performance to the well-designed interface assembled by MXene. Therefore, this freestanding composite film has immense applied value in highly integrated electronic devices.

中文翻译：

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少量分层的Ti ₃ C ₂薄片通过组装设计良好的界面大大提高了氮化硼纸的导热性†

电子设备的飞速发展对热管理材料提出了更严格的要求。传统的聚合物复合材料由于其低热导率（TC）而不能满足这些要求。具有固有高TC的二维（2D）纳米材料的迅速发展为我们提供了制备高导热复合材料的新途径。在我们的工作中，选择了少量剥离的Ti ₃ C ₂ T _x纳米片与氮化硼纳米片配合，通过真空辅助过滤来制造分层的复合膜。我们发现少量的Ti ₃ C ₂ T _x改变复合膜的面内温度系数。我们的实验结果表明，当混合填料中Ti ₃ C ₂ T _x的质量含量为5％时，该复合膜具有极高的面内导热率，最高可达52.4 W m ^-1 K ^-1，并且仍保持良好的电绝缘性能。此外，更有趣的是，少量添加了Ti ₃ C ₂ T _x可以同时提高薄膜的拉伸强度和断裂应变。我们将导热性能的提高归功于MXene精心设计的界面。因此，这种独立的复合膜在高度集成的电子设备中具有巨大的应用价值。