1. Engineering Research Center of Mechanical Testing Technology and Equipment Ministry of Education Chongqing University of Technology Chongqing 400054 China
2. School of Mechanical and Electrical Engineering Guilin University of Electronic Technology Guilin 541004 China
3. Beijing Institute of Nanoenergy and Nanosystems Chinese Academy of Sciences Beijing 101400 China
4. Center on Nanoenergy Research School of Physical Science and Technology Guangxi University Nanning 530004 China
5. College of Nanoscience and Technology University of Chinese Academy of Sciences Beijing 100049 P. R. China
6. School of Materials Science and Engineering Georgia Institute of Technology Atlanta GA 30332‐0245 USA