1. CIQ-UP L4, Faculdade de Ciências, Universidade do Porto, Rua do Campo Alegre, 687, 4169-007 Porto, Portugal
2. Department of Science and Engineering of Oxide Materials and Nanomaterials, Faculty of Applied Chemistry and Materials, University Politehnica of Bucharest, Gh.Polizu street 1-7, 011061 Bucharest, Romania