1. CAS Key Laboratory of Carbon MaterialsInstitute of Coal ChemistryChinese Academy of Sciences 27 Taoyuan South Road Taiyuan 030001 China
2. University of Chinese Academy of Sciences Beijing 100049 China
3. Center of Materials Science and Optoelectronics EngineeringUniversity of Chinese Academy of Sciences Beijing 100049 China
4. National Engineering Laboratory for Carbon Fiber TechnologyInstitute of Coal ChemistryChinese Academy of Sciences 27 Taoyuan South Road Taiyuan 030001 China