Guanjun Xu1, Hanyun Cheng1, Robin Jones2, Yiqing Feng1, Kedong Gong1, Kejian Li1, Xiaozhong Fang1, Muhammad Ali Tahir1, Ventsislav Kolev Valev2, and Liwu Zhang1,3,*
1 Shanghai Key Laboratory of Atmospheric Particle Pollution and Prevention, Department of Environmental Science & Engineering, Fudan University, Shanghai 200433, Peoples'Republic of China
2 Centre for Photonics and Photonic Materials and Centre for Nanoscience and Nanotechnology, Department of Physics, University of Bath, Claverton Down, Bath BA2 7AY, U.K.
3 Shanghai Institute of Pollution Control and Ecological Security, Shanghai 200092, Peoples'Republic of China