Istituto per lo Studio dei Materiali Nanostrutturati (ISMN) - Consiglio Nazionale delle Ricerche (CNR), Via P. Gobetti 101, 40129 Bologna, Italy.
School of Physics and Astronomy, University of Nottingham, Nottingham NG7 2RD, UK.
Nanoscale. 2019 Oct 7;11(37):17252-17261. doi: 10.1039/c9nr01155b. Epub 2019 Jul 18.
Mechanically exfoliated two-dimensional (2D) black phosphorus (bP) is epitaxially terminated by monolayers and multilayers of tetracosane, a linear alkane, to form a weakly interacting van der Waals heterostructure. Atomic force microscopy (AFM) and computational modelling show that epitaxial domains of alkane chains are ordered in parallel lamellae along the principal crystalline axis of bP, and this order is extended over a few layers above the interface. Epitaxial alkane multilayers delay the oxidation of 2D bP in air by 18 hours, in comparison to 1 hour for bare 2D bP, and act as an electrical insulator, as demonstrated using electrostatic force microscopy. The presented heterostructure is a technologically relevant insulator-semiconductor model system that can open the way to the use of 2D bP in micro- and nanoelectronic, optoelectronic and photonic applications.
机械剥离的二维（2D）黑磷（bP）通过线性烷烃二十四烷的单层和多层外延终止，形成弱相互作用的范德华异质结构。原子力显微镜（AFM）和计算模型表明，烷烃链的外延畴沿 bP 的主晶轴平行排列成层状，这种有序状态在界面上方的几个层中延伸。与裸露的二维 bP 的 1 小时相比，外延烷烃多层将二维 bP 在空气中的氧化延迟了 18 小时，并且如静电力显微镜所示，作为电绝缘体。所提出的异质结构是一个与技术相关的绝缘体-半导体模型系统，可以为二维 bP 在微纳电子学、光电学和光子学应用中的应用开辟道路。
