1. Functional Materials Development Center (CDMF), Federal University of São Carlos─UFSCar, 13565-905São Carlos, São Paulo, Brazil
2. Department of Physical and Analytical Chemistry, University Jaume I─UJI, 12071Castelló de la Plana, Spain
3. Nanox Tecnologia S/A, 13562-400São Carlos, São Paulo, Brazil
4. Department of Natural Science, Minas Gerais State University─UEMG, Av. Paraná, 3001, CEP, 35501-170Divinópolis, Minas Gerais, Brazil