Zhang Zhixun, Zhou Ming, Zhang Taohong, Yang Mingyang, Yang Qingfeng, Yu Jianwen, Zhang Yibo
State Key Laboratory of Tribology, School of Mechanical Engineering, Tsinghua University, Beijing 100084, China.
Key Laboratory for Advanced Materials Processing Technology, Ministry of Education, Beijing 100084, China.
ACS Appl Mater Interfaces. 2020 Apr 29;12(17):19746-19754. doi: 10.1021/acsami.9b19407. Epub 2020 Apr 17.
Once two-dimensional boron-based materials were forecasted, their excellent physical and chemical properties have realized attractive application value in the field of materials science. However, borophene could not exist independently and stably in nature. Molecular beam epitaxy is the only way being used currently for the preparation of borophene, which has low yield and harsh experimental installation conditions. Here, we propose the theory that few-layer borophene supported by silver nanoparticles can exist stably and large-scale preparation of few-layer borophene can be performed by mechanical resonance first. We have revealed that the structure of the prepared borophene is α-sheet and its thickness is less than 4 nm. The oxidation rate of borophene from the experiment is about 0.19, which indicates that the few-layer borophene possesses good structure stability. We have also studied the structure stability of borophene on silver nanoparticles by first principles calculation. The calculation proves that few-layer borophene can exist stably supported with silver nanoparticles. Furthermore, the terahertz shielding and stealth performance of the few-layer borophene have been explored. The maximum terahertz shielding effectiveness value of the prepared material could reach up to 50 and 21.5 dB for the reflection loss value in the broadband range of 0.1-2.7 THz. The large-scale preparation of few-layer borophene through the mechanical method makes it possible to study the properties of borophene and achieve low-cost large-scale applications, such as the study of terahertz shielding and stealth performance in the article, which facilitates the lightweight material design for terahertz shielding and stealth.
自从二维硼基材料被预测以来，其优异的物理和化学性质在材料科学领域实现了诱人的应用价值。然而，硼烯在自然界中不能独立且稳定地存在。分子束外延是目前用于制备硼烯的唯一方法，但其产率低且实验装置条件苛刻。在此，我们提出了由银纳米颗粒支撑的少层硼烯可以稳定存在且可首先通过机械共振进行少层硼烯大规模制备的理论。我们已经揭示所制备的硼烯结构为α-片层且其厚度小于4nm。实验测得硼烯的氧化速率约为0.19，这表明少层硼烯具有良好的结构稳定性。我们还通过第一性原理计算研究了硼烯在银纳米颗粒上的结构稳定性。计算证明少层硼烯在银纳米颗粒支撑下可以稳定存在。此外，还探索了少层硼烯的太赫兹屏蔽和隐身性能。所制备材料在0.1 - 2.7THz宽带范围内的反射损耗值，其最大太赫兹屏蔽效能值可达50dB和21.5dB。通过机械方法大规模制备少层硼烯使得研究硼烯的性质并实现低成本大规模应用成为可能，如本文中对太赫兹屏蔽和隐身性能的研究，这有利于太赫兹屏蔽和隐身的轻质材料设计。
