1. Functional Materials Laboratory, Institute of Chemistry, University of Campinas (UNICAMP), 13083-970 Campinas, São Paulo, Brazil
2. Brazilian Nanotechnology National Laboratory, Brazilian Center for Research in Energy and Materials, 13083-100 Campinas, São Paulo, Brazil
3. “Gleb Wataghin” Institute of Physics, University of Campinas (UNICAMP), 13083-859 Campinas, São Paulo, Brazil