1. Department of Materials Engineering Federal University of Campina Grande Campina Grande Paraiba Brazil
2. Hydrogen Fuel Cells Center Nuclear and Energy Research Institute São Paulo São Paulo Brazil
3. Center for Technology in Nanomaterials and Graphene Federal University of Minas Gerais Belo Horizonte Minas Gerais Brazil
4. Department of Materials Engineering Federal University of Rio Grande do Norte Natal Rio Grande do Norte Brazil
5. Mackenzie Institute for Research in Graphene and Nanotechnologies ‐ MackGraphe, Mackenzie Presbyterian University São Paulo São Paulo Brazil