磷烯
单层
上部结构
扫描隧道显微镜
材料科学
外延
结晶学
基质(水族馆)
剥脱关节
二聚体
纳米技术
图层(电子)
化学
石墨烯
有机化学
物理
海洋学
地质学
热力学
作者
Tingting Zhang,Zuo Li,Kai Sun,Xia Yang,Min-Long Tao,Jiyong Yang,Jun‐Zhong Wang
摘要
As a promising two-dimensional (2D) material, phosphorene has attracted tremendous research interest in both fundamental research and potential applications. Up to now, black phosphorene, blue phosphorene, violet phosphorene, and ultrathin nanosheets of red phosphorus have been successfully synthesized by mechanical exfoliation or epitaxial growth, while the synthesis of 2D white phosphorus (WP) has not been achieved. Here, we report the epitaxial growth of monolayer WP on Cd(0001) by means of low temperature (90 K) deposition. Scanning tunneling microscopy observation and first-principles calculations demonstrate that the monolayer WP is comprised of parallel dimer rows of P4 molecules, resembling the a–c plane of γ-phase WP. The monolayer WP is semiconducting with a bandgap of 1.5 eV. Increasing the substrate temperature to 120 K leads to the formation of a quasi-3 × 3 superstructure with building blocks of P4 nonamers. Voltage pulses from STM tip result in the structural transition from the quasi-3 × 3 superstructure to a 3 × 1 superstructure, of which the latter consists of alternating dimer rows and polymerized monomer rows. These observations demonstrate the essential role of dimerization, trimerization, and polymerization of P4 molecules in the formation of 2D white phosphorus.
科研通智能强力驱动
Strongly Powered by AbleSci AI