标题： 碳化物MXene纳米片中的化学键合 显示英文标题

标题： Chemical bonding in carbide MXene nanosheets

摘要： 碳化物核心中的化学键合以及新型过渡金属碳化物 Tin+1Cn-Tx (n=1,2) 也就是 MXenes 的表面化学性质已通过表面敏感的价带 X 射线光电子能谱进行研究。 不同厚度的堆叠纳米片的带结构变化与影响弹性及输运性质的 TiC 和 TiO2 已知杂化区域相关联。 通过采用高激发能，价带底部的 C 2s - Ti 3d 杂化区域的光电子截面得到增强。 如本工作所示，O 2p 和 F 2p 带强烈依赖于与表面基团的键长以及吸附位点。 还讨论了表面氧化和 Ar+ 剥蚀对电子结构的影响。 显示英文摘要

摘要： The chemical bonding in the carbide core and the surface chemistry in a new group of transition-metal carbides Tin+1Cn-Tx (n=1,2) called MXenes have been investigated by surface-sensitive valence band X-ray photoelectron spectroscopy. Changes in band structures of stacked nano sheets of different thicknesses are analyzed in connection to known hybridization regions of TiC and TiO2 that affect elastic and transport properties. By employing high excitation energy, the photoelectron cross-section for the C 2s - Ti 3d hybridization region at the bottom of the valence band is enhanced. As shown in this work, the O 2p and F 2p bands are shown to strongly depend both on the bond lengths to the surface groups and the adsorption sites. The effect of surface oxidation and Ar+ sputtering on the electronic structure is also discussed.