State;
Key;
Laboratory;
of;
Solid;
Lubrication,;
Lanzhou;
Institute;
of;
Chemical;
Physics,;
Chinese;
Academy;
of;
Sciences,;
Lanzhou;
730000,;
China;
Graduate;
University;
of;
Chinese;
Academy;
of;
Sciences,;
Beijing;
100049,;
China;