Repositorio Institucional de la Universidad de Oviedo

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The authors want to thank to the Spanish Ministry of Economy and Competitiveness and the Foundation for the Promotion in Asturias of Applied Scientific Research and Technology (FICYT) for supporting the DPI2013-48348-C2-1-R and GRUPIN14-023 research projects, respectively. The Units of SEM-EDS and Photo-electron spectroscopy (Scientific–Technical Services) from the University of Oviedo are also acknowledged.