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This work was supported by funds from FEDER (COMPETE 2020 Programme) and FCT-Portuguese Foundation for Science and Technology under the projects UID/CTM/50025/2013 and UID/ FIS/04564/2016.M. S. I. is grateful to the Fundac¸ao para a Ciencia e Tecnologia (FCT) for nancial support through the project “MATIS – Materiais e Tecnologias Industriais Sustent´aveis (CENTRO-01-0145-FEDER-000014). V. A. K. is grateful to FCT for nancial support through the FCT Investigator Programme (project IF/00819/2014/CP1223/CT0011). The authors are grateful to Dr A. L. Kholkin (University of Aveiro) for access to SPMfacility.