Atomically Resolved Structural and Chemical Investigation of Single MXene Sheets

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• 作者：Linda H. Karlsson ; Jens Birch ; Joseph Halim ; Michel W. Barsoum ; Per O. 脜. Persson
• 刊名：Nano Letters
• 出版年：2015
• 出版时间：August 12, 2015
• 年：2015
• 卷：15
• 期：8
• 页码：4955-4960
• 全文大小：350K
• ISSN：1530-6992

文摘

The properties of two-dimensional (2D) materials depend strongly on the chemical and electrochemical activity of their surfaces. MXene, one of the most recent additions to 2D materials, shows great promise as an energy storage material. In the present investigation, the chemical and structural properties of individual Ti₃C₂ MXene sheets with associated surface groups are investigated at the atomic level by aberration corrected STEM-EELS. The MXene sheets are shown to exhibit a nonuniform coverage of O-based surface groups which locally affect the chemistry. Additionally, native point defects which are proposed to affect the local surface chemistry, such as oxidized titanium adatoms (TiO_x), are identified and found to be mobile.