Tuning the porosity of bimetallic nanostructures by a soft templating approach Auteur(s): Lehoux Anaïs, Ramos L., Beaunier Patricia, Uribe Daniel Bahena, Dieudonne-George P., Audonnet Fabrice, Etcheberry Arnaud, José-Yacaman Miguel, Remita Hynd (Article) Publié: Advanced Functional Materials, vol. 22 p.4900 (2012) Texte intégral en Openaccess : Ref HAL: hal-00762379_v1 Ref Arxiv: 1212.1064 DOI: 10.1002/adfm.201200666 WoS: 000312300600006 Ref. & Cit.: NASA ADS Exporter : BibTex | endNote 32 Citations Résumé: We use hexagonal mesophases made of oil-swollen surfactant-stabilized tubes arranged on a triangular lattice in water and doped with metallic salts as templates for the radiolytic synthesis of nanostructures. The nanostructures formed in this type of soft matrix are bimetallic palladium-platinum porous nanoballs composed of 3D-connected nanowires, of typical thickness 2.5 nm, forming hexagonal cells. We demonstrate using electron microscopy and small-angle X-ray scattering that the pore size of the nanoballs is directly determined by the diameter of the oil tube of the doped mesophases, which we have varied in a controlled fashion from 10 to 55 nm. Bimetallic nanostructures comprising various proportions of palladium and platinum can be synthesized. Their alloy structure was evidenced by X-ray photoelectron spectroscopy, energy-dispersive X-ray spectroscopy, and high-angular dark field scanning transmission electron microscopy experiments. Our templating approach allows therefore the synthesis of bimetallic nanoballs of tunable porosity and composition. Commentaires: Journal: Advanced Functional Materials 22, 4900 (2012) |