论文标题
一个最大阶段，不同的MXENES：了解蚀刻条件在ti $ _3 $ c $ _2 $ _2 $ t $ _x $表面化学的关键作用的指南
One MAX phase, different MXenes: a guideline to understand the crucial role of etching conditions on Ti$_3$C$_2$T$_x$ surface chemistry
论文作者
论文摘要
MXENES是一种新的且不断发展的2D材料家族，具有非常有希望的特性，可用于多种应用。从最大相的蚀刻获得，由于前体的化学丰富性，可以靶向许多特性。在此，我们强调了蚀刻代理如何控制Ti $ _3 $ c $ c $ _2 $ t $ t $ _X $的表面化学剂，这是迄今为止研究最广泛的MXENE。通过结合表征工具，例如X射线衍射，X射线光电子，拉曼和电子能量损失光谱，扫描和传输电子显微镜以及表面敏感的电化学反应 - 氢进化反应，她清楚地表明，蚀刻剂（HF，lf oh oh oh $ _3 $ _3 $ _3 $ _3 $ _3 $ _3 $ _3 $ _3 $ _3 $ _3 $ _3 $ _3 $ _3 $ _3 $ _3 $ _3 $ _3 $ _3） o），氧化敏感性，分层能力，插入物种的性质，街间化，缺陷浓度和薄片的大小。除了展示如何使用这些不同的特征工具分析MXENES外，这项工作还强调了MXENE合成路线可以影响目标应用程序。
MXenes are a new, and growing, family of 2D materials with very promising properties for a wide variety of applications. Obtained from the etching of MAX phases, numerous properties can be targeted thanks to the chemical richness of the precursors. Herein, we highlight how etching agents govern surface chemistries of Ti$_3$C$_2$T$_x$, the most widely studied MXene to date. By combining characterization tools such as X-ray diffraction, X-ray photoelectron, Raman and electron energy loss spectroscopies, scanning and transmission electron microscopies and a surface sensitive electrochemical reaction-the hydrogen evolution reaction, HER-we clearly demonstrate that the etching agent (HF, LiF/HCl or FeF$_3$/HCl) strongly modifies the nature of surface terminal groups (F, OH and/or O), oxidation sensitivity, delamination ability, nature of the inserted species, interstratification, concentration of defects and size of flakes. Beyond showing how using these different characterization tools to analyze MXenes, this work highlights that the MXene synthesis routes can influence targeted applications.
