1. Brazilian Nanotechnology National Laboratory (LNNANO), Brazilian Center for Research in Energy and Materials (CNPEM), Campinas 13083-970, Brazil
2. Centro de Ciências Naturais e Humanas (CCNH), Federal University of ABC (UFABC), Santo André 09210580, Brazil
3. International Research Center for Renewable Energy (IRCRE), State Key Laboratory of Multiphase Flow in Power Engineering, School of Energy and Power Engineering, Xi'an Jiaotong University, Xi'an 710049, China
4. Nanomaterials and Devices Laboratory, Department of Physics, University of Houston, Houston, Texas 77204, USA