1. State Key Laboratory of Solidification Processing
2. Center for Nano Energy Materials
3. Northwestern Polytechnical University and Shaanxi Joint Laboratory of Graphene (NPU)
4. Xi'an 710072
5. China
6. University Research Facility in Materials Characterization and Device Fabrication
7. The Hong Kong Polytechnic University
8. Shaanxi Coal and Chemical Technology Institute Co., Ltd
9. Xi'an 710070