1. Department of Materials Science and Engineering, National Taiwan University, Taipei 106-17, Taiwan
2. Department of Applied and Environmental Chemistry, University of Szeged, 6720 Szeged, Rerrich Béla tér 1, Hungary
3. Technical Chemistry, Department of Chemistry, Chemical-Biological Center, Umeå University, SE-901 87 Umeå, Sweden
4. Industrial Chemistry and Reaction Engineering, Process Chemistry, Centre, Åbo Akademi University, Biskopsgata 8 FI-20500 Åbo-Turku, Finland
5. Department of Physics, National Taiwan University, Taipei, Taiwan
6. Department of Materials Science and Engineering, Rice University, Houston, Texas 77005, United States