Two-Dimensional Transition Metal Carbides
Two-Dimensional Transition Metal Carbides
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DOI：
10.1021/nn204153h
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发表时间：
2012-02-01
期刊：
影响因子：
17.1
通讯作者：
Barsoum, Michel W.
中科院分区：
文献类型：
--
作者：
Naguib, Michael;Mashtalir, Olha;Barsoum, Michel W.
在此，我们报告了通过将选择的MAX相粉末浸入氢氟酸HF中来合成二维过渡金属碳化物和碳氮化物。MAX相代表三元、层状、可加工的过渡金属碳化物、氮化物和碳氮化物的大家族（>60个成员）。在此，我们提供了以下MAX相剥落的证据：Ti 2AlC、Ta 4AlC 3、（Ti-0.5，Nb-0.5）（2）AlC、（V-0.5，Cr-0.5）（3）AlC 2和Ti 3AlCN，方法是将其粉末简单浸入室温下，在不同浓度的HF中持续10至72小时，然后进行超声处理。从MAX相中去除“A”族层导致2-D层，我们将其标记为MXene以表示A元素的损失并强调其与石墨烯的结构相似性。发现MXene的薄层电阻与多层石墨烯相当。在压制的MXene表面上与水的接触角测量显示出亲水性行为。
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: Ti2AlC, Ta4AlC3, (Ti-0.5,Nb-0.5)(2)AlC, (V-0.5,Cr-0.5)(3)AlC2, and Ti3AlCN 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.