Strain engineering is one of the most efficient methods to continuously modulate the physical properties of materials. In this paper, the thermal conductivity of blue phosphorene with biaxial tensile strain is systematically investigated by means of phonon Boltzmann transport equation based on first-principles calculations. The results show that the thermal conductivity of blue phosphorene increases firstly with strain, and then decreases dramatically as strain increases further, presenting a abnormal no-monotonic strain-dependence. Meanwhile, the turning range caused by the tensile strain is evidently, which could approach 5%–137% of the conductivity of unstrained case (300 K). The key factor for the abnormal thermal transport behavior in blue phosphorene is mainly originated from the competition between the phonon scattering phase space and strength of blue phosphorene. The findings in this paper are expected to deepen our understanding of the strain effect on the phonon transport properties of blue phosphorene, and also provide helpful guideline for the future thermoelectric and thermal management applications.

应变工程是连续调节材料物理特性的最有效方法之一。本文基于声子玻尔兹曼输运方程，基于第一性原理，系统地研究了具有双轴拉伸应变的蓝色磷光体的导热系数。结果表明，蓝色磷的热导率随应变先增大，然后随着应变的增大而急剧减小，呈现出非单调的应变依赖性。同时，由拉伸应变引起的转弯范围明显，可以达到无应变情况下（300 K）电导率的5％–137％。蓝色磷光体中异常热输运行为的关键因素主要来自声子散射相空间与蓝色磷光体强度之间的竞争。本文的研究结果有望加深我们对应变对蓝色磷的声子传输特性的影响的理解，并为将来的热电和热管理应用提供有用的指导。