Firestein Konstantin L, von Treifeldt Joel E, Kvashnin Dmitry G, Fernando Joseph F S, Zhang Chao, Kvashnin Alexander G, Podryabinkin Evgeny V, Shapeev Alexander V, Siriwardena Dumindu P, Sorokin Pavel B, Golberg Dmitri
Centre for Materials Science and School of Chemistry and Physics, Science and Engineering Faculty, Queensland University of Technology (QUT), 2 George Street, Brisbane, Queensland 4000, Australia.
Emanuel Institute of Biochemical Physics, Russian Academy of Sciences, Kosygina 4 Street, Moscow 119334, Russian Federation.
Nano Lett. 2020 Aug 12;20(8):5900-5908. doi: 10.1021/acs.nanolett.0c01861. Epub 2020 Jul 13.
Two-dimensional transition metal carbides, that is, MXenes and especially TiC, attract attention due to their excellent combination of properties. TiC nanosheets could be the material of choice for future flexible electronics, energy storage, and electromechanical nanodevices. There has been limited information available on the mechanical properties of TiC, which is essential for their utilization. We have fabricated TiC nanosheets and studied their mechanical properties using direct tensile tests inside a transmission electron microscope, quantitative nanomechanical mapping, and theoretical calculations employing machine-learning derived potentials. Young's modulus in the direction perpendicular to the TiC basal plane was found to be 80-100 GPa. The tensile strength of TiC nanosheets reached up to 670 MPa for ∼40 nm thin nanoflakes, while a strong dependence of tensile strength on nanosheet thickness was demonstrated. Theoretical calculations allowed us to study mechanical characteristics of TiC as a function of nanosheet geometrical parameters and structural defect concentration.
二维过渡金属碳化物，即MXenes，尤其是TiC，因其优异的性能组合而备受关注。TiC纳米片可能是未来柔性电子、能量存储和机电纳米器件的首选材料。关于TiC的机械性能，这对其应用至关重要，目前可用的信息有限。我们制备了TiC纳米片，并使用透射电子显微镜内的直接拉伸试验、定量纳米力学映射以及采用机器学习衍生势的理论计算来研究其机械性能。发现垂直于TiC基面方向的杨氏模量为80 - 100 GPa。对于约40 nm厚的纳米薄片，TiC纳米片的拉伸强度高达670 MPa，同时还证明了拉伸强度对纳米片厚度有很强的依赖性。理论计算使我们能够研究TiC的机械特性与纳米片几何参数和结构缺陷浓度的函数关系。
