用于二维材料的通用且可扩展的气相蚀刻与转化平台
General and scalable vapor etching and transformation platform for two-dimensional materials
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中文总结 AI 辅助
研究利用气相蚀刻和转化平台制备二维碳化物等材料库，通过氯化氢等反应性蒸汽从MAX相制备MXenes，改变蒸汽环境可对MXenes进行工程设计及转化，为二维材料合成及应用开辟新途径。
中文摘要 AI 辅助
源自非范德华（non-vdW）固体的二维（2D）纳米材料具有优异的物理化学性质，但其合成受前体固有共价/金属键和高表面反应性阻碍。本文报道了一个通用的气相蚀刻和转化平台，可制备36种二维碳化物、氮化物和碳氮化物库，电导率跨越六个数量级。利用氯化氢等反应性蒸汽，从MAX相选择性去除A层以生成明确定义的层（MXenes），包括之前难以获得的半导体Hf2CTx。通过改变反应性蒸汽环境，可在X位点和表面终止位点对MXenes进行工程设计，甚至转化为非vdW层如二维MAX相。该通用且可扩展的气相平台重塑了二维材料合成，为各种应用开辟了新途径。
英文摘要
Two-dimensional (2D) nanomaterials derived from non-van der Waals (non-vdW) solids offer exceptional physicochemical properties, yet their synthesis is impeded by intrinsic covalent/metallic bonding and high surface reactivity of the precursors. Here, we report a general vapor-phase etching and transformation platform for producing a library of 36 2D carbides, nitrides, and carbonitrides, exhibiting electrical conductivities spanning six orders of magnitude. Using reactive vapors like hydrogen chloride, we selectively remove A-layers from MAX phases to yield well-defined layers (MXenes), including previously inaccessible semiconducting Hf2CTx. By varying the reactive vapor environment, MXenes can be engineered at X-site and surface-termination site and even be transformed into non-vdW layers such as 2D MAX phases. This general and scalable vapor-phase platform reframes 2D material synthesis, opening new avenues for various applications.
