Key Laboratory of Optoelectronic Technology of Jiangsu Province, School of Physics and Technology, Nanjing Normal University, Nanjing 210023, China.
Nanoscale. 2018 Dec 21;10(47):22448-22455. doi: 10.1039/c8nr06560h. Epub 2018 Nov 27.
Rolling up 2D atomic layered materials into 1D nanotubes gives rise to fascinating properties due to their lower dimension, higher anisotropy, and strain effects. In this work, the curving of 2D graphitic CN (g-CN) sheets into 1D nanotubes is demonstrated for the first time through simple and clean ultrasonic treatments. The steady-state optical transitions are slightly enhanced while the localized trapping of excited carriers is considerably suppressed after rolling up the planar sheets into nanotubes. The mechanical method to modulate the dimension scarcely changes the chemical structures, enabling the pure investigation on shape-induced physical effects. As a proof of principle, this work confirms the dynamics of excited carriers, and the photoelectronic properties of 2D semiconductors can be significantly engineered by a simple morphological evolution.
将二维原子层材料卷成一维纳米管会由于其较低的维度、更高的各向异性和应变效应而产生引人注目的性质。在这项工作中，首次通过简单而清洁的超声处理证明了二维石墨碳氮化物（g-CN）片卷曲成一维纳米管。在将平面片卷成纳米管后，稳态光学跃迁略有增强，而激子的局域俘获则得到了极大的抑制。通过机械方法来调节维度几乎不会改变化学结构，从而可以对形状诱导的物理效应进行纯研究。作为原理的证明，这项工作证实了激子载体的动力学，并且二维半导体的光电性质可以通过简单的形态演化得到显著的调控。
