Belmonte, T (Reprint Author), Univ Lorraine, Inst Jean Lamour, UMR CNRS 7198, F-54042 Nancy, France. Saa, D. Kuete; Kosior, F.; Al Taweel, A.; Gries, T.; Belmonte, T., Univ Lorraine, Inst Jean Lamour, UMR CNRS 7198, F-54042 Nancy, France. Saa, D. Kuete; Laminsi, S., Univ Yaounde I, Lab Chim Minerale, Yaounde 812, Cameroon. Cardoso, R. P., Univ Fed Parana, BR-81531990 Curitiba, Parana, Brazil. Gries, T.; Belmonte, T., CNRS, Inst Jean Lamour, UMR CNRS 7198, F-54042 Nancy, France.
Mots clefs: RuO2; Nanostructuration; Localized growth; Micro-plasma; Afterglow
Resume: Various ruthenium dioxide nanostructures were grown locally by the oxidation of ruthenium samples with an Ar-O-2 microwave micro-afterglow operated at atmospheric pressure. A special attention was paid to the distribution of the surface temperature of the sample which evolves between 530 K and 820 K. Whatever the treatment time, the temperature and the gas composition set within the studied ranges, a general nanostructure, made of lamellae separated by 20-50 nm, is found. When the temperature rises, localized nano-sea urchins, nanotubes with square sections, nano-needles, and more complex structures are found spread over the surface. Treated surfaces were characterized by different surface diagnostics (SEM, XRD, SIMS, etc.) Finally, a growth mechanism is proposed emphasizing the role of emerging defects and stress on the appearance of localized nanostructures. (C) 2013 Elsevier B.V. All rights reserved.
Equipe: Centre de Compétences : ERMIONE informatique et calcul