Jiaoli Li1,Yuwei Zhang1,Yanxiao Li2,Yuxiang Gan1,Risheng Wang1,Chenglin Wu1
MST1,NYU2
Jiaoli Li1,Yuwei Zhang1,Yanxiao Li2,Yuxiang Gan1,Risheng Wang1,Chenglin Wu1
MST1,NYU2
High entropy MXene (HE MXene) is a new frontier MXene that has great potential for solid lubricants due to its diverse composition, volatile physical and chemical features. Here we experimentally investigated the friction of two HE MXene (TiVNbMoC<sub>3</sub>T<sub>x</sub> and TiVCrMoC<sub>3</sub>T<sub>x</sub>) and compared their friction properties with Ti<sub>3</sub>C<sub>2</sub>T<sub>x</sub> MXene, Ti<sub>2</sub>CT<sub>x</sub> MXene, graphene, and MoSe<sub>2</sub> at the nanoscale via atomic force microscopy (AFM). Different scan distances (15nm and 1µm) and layers (1, 2, 3, 4, 5, 6, and more than 6 layers) were applied to obtain the corresponding friction properties of each of these 2D materials. Moreover, effect of the terminal groups on the friction behaviors at the nanoscale was also investigated by removing the -OH functional groups on HE, Ti<sub>3</sub>C<sub>2</sub>T<sub>x</sub> and Ti<sub>2</sub>CT<sub>x</sub> MXene surfaces using annealing treatment. Our preliminary result has shown that the friction properties of HE MXene are similar to Ti<sub>3</sub>C<sub>2</sub>T<sub>x</sub> and Ti<sub>2</sub>CT<sub>x</sub> MXene, and superior to graphene and MoSe<sub>2</sub>. Furthermore, decreasing the number of -OH groups could greatly improve the friction performance of all types of MXene. This study provides experimental basis for the application of modified MXene into solid lubrication.