Elastic properties of 2D Ti(3)C(2)T (x) MXene monolayers and bilayers.
Elastic properties of 2D Ti(3)C(2)T (x) MXene monolayers and bilayers.
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DOI：
10.1126/sciadv.aat0491
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发表时间：
2018-06
期刊：
影响因子：
13.6
通讯作者：
Sinitskii A
中科院分区：
文献类型：
--
作者：
Lipatov A;Lu H;Alhabeb M;Anasori B;Gruverman A;Gogotsi Y;Sinitskii A
纳米压痕实验表明，Ti3C2Tx Mxenes具有比其他固溶处理的2D材料更高的弹性模量。二维(2D)过渡金属碳化物和氮化物，又称MXenes，是一大类材料，从储能和电磁干扰屏蔽到水净化和抗菌涂层，有着广泛的应用。然而，尽管已经合成了20多种不同的MXenes，但MXene单分子膜的力学性能还没有被实验研究。我们测量了迄今为止最重要的MXene材料Ti3C2Tx(Tx代表表面端接)的单层和双层的弹性性能。我们开发了一种制备应变良好的Ti3C2Tx单层和双层薄膜的方法，并用原子力显微镜的尖端进行了纳米压痕，记录力-位移曲线。单层Ti3C2Tx的有效杨氏模数为0.33±0.03 Tpa，是包括氧化石墨烯在内的其他溶液处理2D材料的纳米压痕实验中最高的。这项工作为研究其他MXenes的单层和双层的机械性能开辟了一条途径，并将MXenes本已广泛的应用范围扩展到结构复合材料、保护性涂层、纳米谐振器和薄膜，这些需要具有特殊机械性能的材料。
Nanoindentation experiments show that Ti3C2Tx MXenes have a higher elastic modulus than other solution-processed 2D materials. Two-dimensional (2D) transition metal carbides and nitrides, known as MXenes, are a large class of materials that are finding numerous applications ranging from energy storage and electromagnetic interference shielding to water purification and antibacterial coatings. Yet, despite the fact that more than 20 different MXenes have been synthesized, the mechanical properties of a MXene monolayer have not been experimentally studied. We measured the elastic properties of monolayers and bilayers of the most important MXene material to date, Ti3C2Tx (Tx stands for surface termination). We developed a method for preparing well-strained membranes of Ti3C2Tx monolayers and bilayers, and performed their nanoindentation with the tip of an atomic force microscope to record the force-displacement curves. The effective Young’s modulus of a single layer of Ti3C2Tx was found to be 0.33 ± 0.03 TPa, which is the highest among the mean values reported in nanoindentation experiments for other solution-processed 2D materials, including graphene oxide. This work opens a pathway for investigating the mechanical properties of monolayers and bilayers of other MXenes and extends the already broad range of MXenes’ applications to structural composites, protective coatings, nanoresonators, and membranes that require materials with exceptional mechanical properties.
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