1. Chemistry Department, CDMF, LIEC, Federal University of São Carlos, P.O. Box 676, São Carlos, São Paulo 13565-905, Brazil
2. Instituto de Química de São Carlos, Universidade de São Paulo, P.O.
Box 780, São Carlos, São Paulo 13566-590,Brazil
3. CDMF, LIEC, Chemistry Institute of the Paulista State University, UNESP, P.O. Box 1680, Araraquara, São Paulo 14801903, Brazil
4. Department of Physical and Analytical Chemistry, University Jaume I, Castelló 12071, Spain
5. Physics Department, Federal University of São Carlos, P.O. Box 676, São Carlos, São Paulo 13565-905, Brazil
6. Brazilian Nanotechnology National Laboratory, Rua Giuseppe Maximo Scolfa no. 10000, Campinas, São Paulo BR-13083100, Brazil