College of Materials Science and Engineering, Hunan University, Changsha 410082, China;
College of Materials Science and Engineering, Hunan University, Changsha 410082, China;
College of Materials Science and Engineering, Hunan University, Changsha 410082, China;
College of Materials Science and Engineering, Hunan University, Changsha 410082, China;
molybdenum disulfide; wear; high-resistivity brushes; humidity;