Self‐assembled monolayers (SAMs) serve as convenient platform for fabricating carbon nanomembranes (CNMs) of extended lateral dimensions. Highly porous CNMs are emerging as interesting materials for membrane technologies as they exhibit selectivity for water permeation and, owing to their reduced dimensionality, promise increased energy efficiency compared to established systems. In the present study terphenylcarboxylate SAMs, prepared on silver underpotential deposited on Au and irradiated by 100 eV electrons, were successfully converted into free‐standing CNMs. Infrared and X‐ray photoelectron spectroscopy reveal pronounced chemical changes both of the anchoring carboxylate moiety and the aromatic backbone upon electron irradiation. Permeation studies showed high specificity for water as demonstrated by the separation from tetrahydrofuran. Compared to thiols on gold, the standard CNM precursor system, the carboxylic acid based SAM exhibits equivalent characteristics. This suggests that electron‐induced carbonization is insensitive to the particular choice of the anchor moiety and, therefore, the choice of precursor molecules can be extended to the versatile class of aromatic carboxylic acids.

中文翻译：

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来自芳香族羧酸盐前体的碳纳米膜。

自组装单层（SAM）是制造横向尺寸较大的碳纳米膜（CNM）的便捷平台。高孔隙度 CNM 正在成为膜技术领域有趣的材料，因为它们对水渗透具有选择性，并且由于其尺寸减小，与现有系统相比，有望提高能源效率。在本研究中，三联苯羧酸盐 SAM 是在 Au 上沉积银欠电势并用 100 eV 电子辐照制备的，已成功转化为独立式 CNM。红外和 X 射线光电子能谱揭示了电子辐照时锚定羧酸酯部分和芳香族主链发生显着的化学变化。渗透研究显示出对水的高度特异性，如与四氢呋喃的分离所证明的那样。与金上的硫醇（标准 CNM 前体系统）相比，基于羧酸的 SAM 表现出相同的特性。这表明电子诱导碳化对锚定部分的特定选择不敏感，因此前体分子的选择可以扩展到多种芳香族羧酸。