1. School of Materials Science and Engineering, Shenyang University of Technology, Shenyang 110870, China
2. Experimental Teaching Center, Shenyang Normal University, Shenyang 110034, China
3. Department of Basic Teaching, Shenyang Institute of Science and Technology, Shenyang 110167, China
4. College of Physics Science and Technology, Shenyang Normal University, Shenyang 110034, China