*Ying Song1, Zong Wei Xu1, Tao Liu1, Mathias Rommel2, Hong Wang3, Feng Zhou Fang1
(1. State Key Lab. of Precision Measuring Tech. & Instruments, Centre of Micro/Nano Manufacturing Tech. Tianjin Univ. (China), 2. Fraunhofer Inst. for Integrated Systems and Device Tech.(Germany), 3. State Key Lab. of Separation Membranes and Membrane Processes, School of Materials Sci. and Engineering, Tianjin Polytechnic Univ.(China))