1. State Key Laboratory of Solid Lubrication Lanzhou Institute of Chemical Physics Chinese Academy of Sciences Lanzhou 730000 China
2. Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of Sciences Beijing 100049 China
3. Department of Engineering for Innovation Universitá del Salento Monteroni Lecce 73100 Italy
4. Department of Mechanical Engineering Imperial College London London SW7 2AZ UK
5. Istituto Italiano di Tecnologia (IIT) Center for Bio‐Molecular Nanotechnologies Arnesano Lecce 73010 Italy