1. Department of Applied Physics and Materials Research Center The Hong Kong Polytechnic University Hong Kong SAR China
2. College of Geography and Environmental Science, and Department of Physics Zhejiang Normal University Jinhua 321004 China
3. College of Environmental and Chemical Engineering Xi'an Polytechnic University Xi'an 710048 China
4. School of Science Xi'an University of Posts and Communications Xi'an 710121 China
5. School of Materials Science and Engineering Nanjing University of Science and Technology Nanjing 210094 China
6. Department of Physics Shanghai Normal University Shanghai 200235 China
7. College of Physics Optoelectronics and Energy, and Jiangsu Key Laboratory of Thin Films Soochow University Suzhou 215006 China
8. College of Environmental Science and Engineering State Key Laboratory for Modification of Chemical Fibers and Polymer Materials Donghua University Shanghai 201620 China