1. Institute of Physics Gleb Wataghin (IFGW), Universidade Estadual de Campinas, Campinas, 13083-859 SP, Brazil
2. Department of Physical and Analytical Chemistry, University Jaume I (UJI), Castelló 12071, Spain
3. Laboratório Nacional de Nanotecnologia (LNNano), CNPEM, Campinas, 13083-970 SP, Brazil
4. LIEC-CDMF, Department of Chemistry, Universidade Federal de São Carlos, São Carlos, 13565-905 SP, Brazil
5. Department of Physical-Chemistry, Institute of Chemistry, Universidade Estadual de Campinas, Campinas, 13083-970 SP, Brazil