1. College of Chemistry and Chemical Engineering, Shandong Sino-Japanese Center for Collaborative Research of Carbon Nanomaterials, Instrumental Analysis Center of Qingdao University, Qingdao University, Qingdao 266071, PR China
2. Department of Chemistry and Biochemistry, University of Texas at El Paso, El Paso, Texas 79968, United States
3. Department of Physics, University of Texas at El Paso, El Paso, Texas 79968, United States
4. Environmental Science and Engineering, Material Science & Engineering, University of Texas at El Paso, El Paso, Texas 79968, United States
5. Border Biomedical Research Center, Forensic Science, University of Texas at El Paso, El Paso, Texas 79968, United States