Symmetry-Breaking Triggered by Atomic Tungsten for Largely Enhanced Piezoelectric Response in Hexagonal Boron Nitride
Symmetry-Breaking Triggered by Atomic Tungsten for Largely Enhanced Piezoelectric Response in Hexagonal Boron Nitride
复制标题
DOI：
10.1016/j.nanoen.2022.107375
复制
发表时间：
2022-05
期刊：
影响因子：
17.6
通讯作者：
Zhang Tao;Yue Li;Lianhui Li;Xiaoming Dong;Peiyan Sun;Xinyang Mu;Xiuling Zha;Jian Chen
中科院分区：
文献类型：
--
作者：
Zhang Tao;Yue Li;Lianhui Li;Xiaoming Dong;Peiyan Sun;Xinyang Mu;Xiuling Zha;Jian Chen
晶体对称性的破坏导致了晶格畸变的出现，晶格畸变对材料的压电性能起着至关重要的作用。然而，针对对称性破坏的策略主要局限于传统的结晶学考虑，如掺杂或控制特定材料相的合成，这极大地限制了压电研究的范围。在这里，我们首次报告了一种“厚重的球压布”策略可以应用于具有显著增强的压电响应的广泛材料。例如，单原子钨(W)锚定在六方氮化硼(h-BN)纳米片中可以极大地提高压电响应，即使在相当小的W负载量(0.34at.%)下，也可以大约是母体h-BN纳米片的12倍。这归因于5d金属W在锚定到二维(2D)晶格中时可以起到“螺栓”的作用，导致显著的晶格扭曲，从而引入惊人的大的面外极化。我们的发现提供了与单原子金属相关的晶格动力学的洞察力，并展示了一种通用的实验技术，这将有助于对压电性能的管理。
The breakdown of crystal symmetry leads to the emergence of lattice distortions, which play an essential role in the piezoelectric properties. However, strategies aimed at symmetry breaking are mainly restricted to traditional crystallographic considerations, such as doping or control synthesis of particular material phases, which greatly limited the scope of piezoelectric investigations. Here, we report for the first time a “heavy ball-pressed-cloth” strategy can be applied to a wide range of materials with significantly enhanced piezoelectric response. For instance, the anchoring of single-atom tungsten (W) into hexagonal boron nitride (h-BN) nanosheets can greatly enhance the piezoelectric response, by approximately 12-fold that of the parent h-BN nanosheets even at a rather small W loading of 0.34 at.%. The boosted piezoelectric is ascribed to the fact that the 5dmetal W can act as a “bolt” in causing significant lattice distortions when anchoring into two-dimensional (2D) lattice, thus introducing a strikingly large out-of-plane polarization. Our findings provide insights into the lattice dynamics related with single-atom metals, and demonstrate a universal experimental technique that would be useful in the management about the piezoelectric properties.