1. School of Materials Science and Engineering Ocean University of China 238 Songling Road Qingdao 266100 P. R. China
2. Department of Chemistry & Biochemistry Utah State University Logan UT 84322 USA
3. Department of Chemistry University of North Carolina at Chapel Hill Chapel Hill NC 27599 USA
4. Institute of Optoelectronic Materials and Devices College of Optical and Electronic Technology China Jiliang University 256 Xueyuan Street Hangzhou 310018 P. R. China
5. Department of Mechanical and Aerospace Engineering Benjamin M. Statler College of Engineering and Mineral Resources West Virginia University Morgantown WV 26506 USA