论文标题
氢和氘等离子体产生的石墨烯边缘的终止
Termination of Graphene Edges Created by Hydrogen and Deuterium Plasmas
论文作者
论文摘要
随着设备尺寸降低到纳米量表，边缘工程对于基本研究和应用都很重要。石墨烯尤其是这种情况，因为石墨烯边缘根据原子结构和终止表现出完全不同的电子特性。最近已经显示，可以使用氢（H）等离子体蚀刻石墨烯和石墨可以获得原子精确的曲折边缘。但是，边缘终止尚未直接研究。在这项研究中，通过高分辨率电子能量损耗光谱（HREELS）研究了由H plasma产生的边缘的终止，以表明边缘为$ \ mathrm {sp}^{2} $ bonged，而边缘碳原子仅由一个H原子终止。这表明，理想的曲折边缘不仅在原子上精确，而且还可以通过h-plasma蚀刻来获得。还通过扫描隧道显微镜（STM）研究了用不同同位素（d）的等离子体蚀刻石墨表面，以表明与H- plasma相比，D-plasma各向异性对石墨的效率较低，尽管它可以使缺陷更有效地使缺陷使缺陷效率更高。
Edge engineering is important for both fundamental research and applications as the device size decreases to nanometer scale. This is especially the case for graphene because a graphene edge shows totally different electronic properties depending on the atomic structure and the termination. It has recently been shown that an atomically precise zigzag edge can be obtained by etching graphene and graphite using hydrogen (H) plasma. However, edge termination had not been studied directly. In this study, termination of edges created by H-plasma is studied by high-resolution electron energy loss spectroscopy (HREELS) to show that the edge is $\mathrm{sp}^{2}$ bonded and the edge carbon atom is terminated by only one H atom. This suggests that an ideal zigzag edge, which is not only atomically precise but also $\mathrm{sp}^{2}$ bonding, can be obtained by H-plasma etching. Etching of the graphite surface with plasma of a different isotope, deuterium (D), is also studied by scanning tunneling microscopy (STM) to show that D-plasma anisotropically etches graphite less efficiently, although it can make defects more efficiently, than H-plasma.
