1. Department of Physics, Laboratory of Nanostructured Multifunctional Materials, Federal University of São Carlos; Washington Luiz Road km 235 13565-905 São Carlos SP Brazil
2. LIEC, Department of Chemistry, Federal University of São Carlos; Washington Luiz Road km 235 13565-905 São Carlos SP Brazil
3. Institute of Physics of São Carlos, University of São Paulo; 400 Trabalhador São-Carlense Avenue 13566-590 São Carlos SP Brazil