1. National Center for International Research on Photoelectric and Energy Materials, Yunnan Key Laboratory for Micro/nano Materials & Technology, School of Materials Science and Engineering, Yunnan University, Kunming 650091, China
2. Southwest United Graduate School, Kunming 650091, China
3. Walker Department of Mechanical Engineering, University of Texas at Austin, Austin, TX 78712, USA
4. Florida International University (FIU), Department of Chemistry and Biochemistry, Miami, FL, USA