Modulation mechanism of electron energy dissipation on superlubricity based on fluorinated 2D ZIFs  

作　　者：Yuxin Li Lei Liu Kunpeng Wang Yuhong Liu 

机构地区：[1]State Key Laboratory of Tribology in Advanced Equipment,Tsinghua University,Beijing 100084,China [2]School of Mechatronic Engineering,Shanghai University,Shanghai 200444,China

出　　处：《Nano Research》2024年第4期3198-3209,共12页纳米研究（英文版）

基　　金：supported by the National Natural Science Foundation of China(Nos.52350323 and 52105194);the National Postdoctoral Fellowship Program of China(No.GZB20230340);the Project was funded by the China Postdoctoral Science Foundation(Nos.2023TQ0184 and 2023M731941).

摘　　要：Electron energy dissipation is an important energy dissipation pathway that cannot be ignored in friction process.Two-dimensional zeolite imidazole frameworks(2D ZIFs)and fluorine doping strategies give 2D Zn-ZIF and 2D Co-ZIF unique electrical properties,making them ideal materials for studying electron energy dissipation mechanism.In this paper,based on the superlubricity modulation of 2D fluoridated ZIFs,the optimal tribological properties are obtained on the 2D F-Co-ZIF surface,with the friction coefficient as low as 0.0010.Electrical experiments,density functional theory(DFT)simulation,and fluorescence detection are used to explain the mechanism of fluorine doping regulation of tribological properties from the two stages,namely energy transfer and energy release.Specifically,the energy will transfer into the friction system through the generation of electron–hole pairs under an external excitation,and release by radiation and non-radiation energy dissipation channels.Fluorination reduces energy transfer by altering the electronic properties and band structures of ZIFs,and slows down the charge transfer by enhancing the shielding efficiency,thus slowing the non-radiative energy dissipation rate during the energy release stage.Our insights not only help us better understand the role of fluorine doping in improving tribological properties,but also provide a new way to further explore the electron energy dissipation pathway during friction.

关 键 词：SUPERLUBRICITY electron energy dissipation MODULATION two-dimensional zeolite imidazole frameworks(2D ZIFs) FLUORINATION 

分 类 号：TH117.2[机械工程—机械设计及理论]