1. School of Science, Xi’an Polytechnic University, Xi’an 710048, PR China
2. State Key Discipline Laboratory of Wide Bandgap Semiconductor Technology, School of Microelectronic, Xidian University, Xi’an 710071, PR China
3. Xi’an Key Laboratory of Nuclear Protection Textile Equipment Technology & Engineering Research Center of Flexible Radiation Protection Technology of Universities of Shaanxi Province, Xi’an Polytechnic University, Xi’an 710048, PR China