1. Department
of Chemical Engineering, School of Environmental and Chemical Engineering, Shanghai University, 99 Shangda Road, Shanghai, P. R. China 200444
2. Department
of Materials Engineering, Hanyang University, Ansan, Gyeonggi-do 426-791, Korea
3. Institute
of Physics, Martin-Luther-Universität Halle-Wittenberg, Halle 06099, Germany
4. Fraunhofer Institute for Microstructure of Materials and Systems (IMWS), Halle 06120, Germany