1. Inorganic Chemistry and Centre of Nanointegration Duisburg-Essen (CENIDE), University of Duisburg-Essen, Universitaetsstr. 5–7, Essen 45117, Germany
2. Department of Chemical and Materials Engineering, Chang Gung University, Kwei-San, Taoyuan 33302, Taiwan
3. Ernst Ruska Centre for Microscopy and Spectroscopy with Electrons, Forschungszentrum Jülich, Jülich 52428, Germany
4. Institute of Physics, University of São Paulo, São Paulo 05508-090, Brazil
5. Department of Neurosurgery, Chang Gung Memorial Hospital, Linkou, Kwei-San, Taoyuan 33305, Taiwan