1. Institute of Physics, University of Brasília, Brasília, DF, 70910-900, Brazil
2. Department of Energy Conversion and Storage, Technical University of Denmark, Anker Engelunds Vej 301, 2800 Kongens Lyngby, Denmark
3. Laboratory of Research on Polymers and Nanomaterials, Institute of Chemistry, University of Brasília, Brasília, DF, 70910-900, Brazil