Department of Organic and Nano Engineering, Hanyang University, Seoul04763, Republic of Korea.
Human-Tech Convergence Program, Hanyang University, Seoul04763, Republic of Korea.
Langmuir. 2023 Feb 14;39(6):2358-2367. doi: 10.1021/acs.langmuir.2c03094. Epub 2023 Feb 3.
Surface modification to improve the oxidation stability and dispersibility of MXene in diverse organic media is a facile strategy for broadening its application. Among the various ligands that can be grafted on the MXene surface, oleylamine (OAm), with amine functionalities, is an advantageous candidate owing to its strong interactions and commercial viability. OAms are grafted onto MXene through covalent bonds induced by nucleophilic reactions and H bonds in liquid interface reactions at room temperature. In addition, this grafting behavior of the ligand was characterized by a reduction in the slope with an increase in the ligand concentration (), confirming that the OAms were grafted via Langmuir-like behavior, and the monolayer of OAms was developed via two distinct steps (I: lying-down phase; II: ordered monolayer). MXene nanosheets modified by OAm (OAm-MX) are highly dispersible in a wide range of organic solvents owing to the alkyl chain of the OAms, which induces hydrophobic properties on the surface of MXene. The OAm-MX dispersion exhibits outstanding oxidation and dispersion stability and remarkable coating performance on a wide range of substrates owing to their excellent solution processability. Therefore, this study provides fundamental insights into the adsorption behavior and interaction between amine ligands and MXene nanosheets for the surface chemistry of MXene.
表面改性可以提高 MXene 在各种有机介质中的氧化稳定性和分散性，这是拓宽其应用的一种简便策略。在可以接枝到 MXene 表面的各种配体中，带有胺官能团的油胺 (OAm) 是一种很有优势的候选配体，因为它具有很强的相互作用和商业可行性。OAm 通过亲核反应诱导的共价键和室温下液体界面反应中的氢键接枝到 MXene 上。此外，这种配体的接枝行为的特征是随着配体浓度的增加，斜率减小（），这证实了 OAm 是通过类 Langmuir 行为接枝的，并且通过两个不同的步骤形成了 OAm 的单层（I：躺倒相；II：有序单层）。由于 OAm 的烷基链，OAm 修饰的 MXene 纳米片（OAm-MX）在很宽的有机溶剂范围内具有很高的分散性，这导致 MXene 表面具有疏水性。由于其出色的溶液加工性能，OAm-MX 分散体表现出出色的氧化和分散稳定性以及在广泛的基底上的出色涂覆性能。因此，这项研究为胺配体与 MXene 纳米片之间的吸附行为和相互作用提供了基本的见解，这对于 MXene 的表面化学具有重要意义。
