1. School of Physics and Materials Science Guangzhou University Guangzhou P. R. China
2. Institute of Semiconductors Guangdong Academy of Sciences Guangzhou P. R. China
3. School of Molecular Sciences and Center for Materials of Universe Arizona State University Tempe Arizona USA
4. Jewelry Institute Guangzhou Panyu Polytechnic Guangzhou P. R. China
5. Collaborative Innovation Center for Exploration of Nonferrous Metal Deposits and Efficient Utilization of Resources, College of Materials Science and Engineering Guilin University of Technology Guilin P. R. China
6. Shaanxi Province Key Laboratory for Electrical Materials and Infiltration Technology, School of Materials Science and Engineering Xi'an University of Technology Xi'an P. R. China