1. Department of Physics, Durham University, South Road, Durham DH1 3LE, United Kingdom
2. Faculty of Chemistry, Silesian University of Technology, Ks. M. Strzody 9, Gliwice 44-100, Poland
3. S3 Center, CNR Institute of Nanoscience, Modena 41125, Italy
4. Institute of Physics, University of São Paulo, São Paulo 05508-090, Brazil
5. Centre of Polymer and Carbon Materials, Polish Academy of Sciences, M. Curie-Sklodowskiej 34, Zabrze 41-819, Poland