Department of Materials Science and Engineering, Drexel University, Philadelphia, Pennsylvania 19104, United States.
ACS Nano. 2012 Feb 28;6(2):1322-31. doi: 10.1021/nn204153h. Epub 2012 Feb 13.
Herein we report on the synthesis of two-dimensional transition metal carbides and carbonitrides by immersing select MAX phase powders in hydrofluoric acid, HF. The MAX phases represent a large (>60 members) family of ternary, layered, machinable transition metal carbides, nitrides, and carbonitrides. Herein we present evidence for the exfoliation of the following MAX phases: Ti(2)AlC, Ta(4)AlC(3), (Ti(0.5),Nb(0.5))(2)AlC, (V(0.5),Cr(0.5))(3)AlC(2), and Ti(3)AlCN by the simple immersion of their powders, at room temperature, in HF of varying concentrations for times varying between 10 and 72 h followed by sonication. The removal of the "A" group layer from the MAX phases results in 2-D layers that we are labeling MXenes to denote the loss of the A element and emphasize their structural similarities with graphene. The sheet resistances of the MXenes were found to be comparable to multilayer graphene. Contact angle measurements with water on pressed MXene surfaces showed hydrophilic behavior.
在此，我们报告了通过将选定的 MAX 相粉末浸入氢氟酸（HF）中来合成二维过渡金属碳化物和氮化物。MAX 相代表了一大类（超过 60 种成员）三元层状可加工过渡金属碳化物、氮化物和碳氮化物。在此，我们提出了以下 MAX 相的剥离证据：Ti(2)AlC、Ta(4)AlC(3)、(Ti(0.5),Nb(0.5))(2)AlC、(V(0.5),Cr(0.5))(3)AlC(2)和 Ti(3)AlCN，通过将它们的粉末在室温下简单地浸入不同浓度的 HF 中 10 至 72 小时，然后进行超声处理。从 MAX 相中去除“A”族层导致二维层，我们将其标记为 MXenes，以表示 A 元素的损失，并强调它们与石墨烯的结构相似性。MXenes 的片电阻与多层石墨烯相当。在压制的 MXene 表面上进行的水接触角测量显示出亲水性。
