The rapid progress of high-performance microelectronic devices underscores the urgent necessity to develop materials possessing superior thermal conductivity for effectively dissipating heat in cutting-edge electronics. Boron nitride nanosheets (BNNSs) have garnered significant attention due to their exceptional thermal conductivity, combined with electrical insulation and low thermal expansion coefficient, offering a promising solution to heat-related challenges in electronic devices. While BNNSs share some common thermal behaviors with other two-dimensional (2D) materials, they also exhibit unique characteristics. For instance, BNNSs exhibit larger isotope disorders compared to graphene, yet their isotope enhancement in thermal conductivity is lower than that of their carbon counterpart. This review provides an overview of the thermal transport properties and mechanisms of BNNSs explored over the past decade, beginning with a brief introduction to the basic of thermal conductivity. It then delves into the thermal transport mechanisms in BNNSs, highlighting factors impacting the in-plane thermal conductivity of BNNSs, as well as the cross-plane thermal conductivity and the factors influencing it. Finally, the review discusses challenges associated with BNNS thermal conductivity measurement and outlines potential future research avenues.

中文翻译：

---

氮化硼纳米片的热传输特性


高性能微电子器件的快速发展凸显了开发具有优异导热性的材料以有效散热尖端电子产品的迫切必要性。氮化硼纳米片 （BNNS） 因其出色的导热性、电绝缘性和低热膨胀系数而受到广泛关注，为电子设备中与热相关的挑战提供了有前途的解决方案。虽然 BNNS 与其他二维 （2D） 材料有一些共同的热行为，但它们也表现出独特的特性。例如，与石墨烯相比，BNNS 表现出更大的同位素紊乱，但它们在热导率方面的同位素增强低于碳对应物。本文概述了过去十年中探索的 BNNS 的热传输特性和机制，首先简要介绍了热导率的基础知识。然后，本文深入研究了 BNNS 中的热传输机制，强调了影响 BNNS 面内热导率的因素，以及跨面热导率及其影响因素。最后，综述讨论了与 BNNS 热导率测量相关的挑战，并概述了未来潜在的研究途径。