Bimetallic Au/Ag Metal Superstructures From Macromolecular Metal Complexes in Solid-State

Abstract

Novel bimetallic Au/Ag superstructures have been prepared from solid-state pyrolysis of the macromolecular complexes Chitosan(MLn/M'Ln) n y PSP-4-PVP×( MLn/M'Ln)n with MLn = AuCl 3 and M'Ln = Ag(CF 3 SO 3 ).The characterization was made from XRD (X-ray diffraction of powder), SEM and EDS analysis. Morphologies are influenced by both the nature of the polymer and the metal/polymer, molar ratio of the polymer precursor. EDS analysis suggests a core/shell Au/Ag structure for the materials. A probable mechanism of the formation of these superstructures is discussed. Although separated reports of metallic superstructures of Au or Ag have been recently described, the here reported are the first bimetallic Au/Ag.

Bimetallic Au//Ag Alloys Inside SiO2 Using a Solid-State Method

“…In a typical synthesis [7], the respective metallic salts AuCl 3 and Ag(CF 3 SO 3 ) were added in a Schlenk tube using CH 2 Cl 2 as solvent under magnetic stirring and then the respective Chitosan amount was added according to the 1:1 (1) or 1:5 (2) molar ratio.…”

“…In a typical synthesis [7] the respective metallic salts AuCl 3 and Ag(CF 3 SO 3 ) were added in a Schlenk tube using CH 2 Cl 2 as solvent under magnetic stirring and then the respective Poly(styrene-co-4-vinylpyridine) amount was added according to the 1:1 (3) or 1:5 (4) molar ratio. After about 6 days the supernatant solution (provided the solid decanted) was extracted with a syringe and the solid dried under reduced pressure to give a solid with diverse colors.…”

“…This normally involves the evaporation of the solvent leading to agglomeration of the nanoparticles [3][4][5][6]. However, solid-state methods to prepare bimetallic Au/Ag NPs are scarce [1,7],as normally such applications involve the incorporation of the bimetallic Au/Ag NPs into a solid matrix [8]. Over all the known methods of preparation of bimetallic Au/Ag NPs [1], only one was reported to use a solid state route [9].…”

Bimetallic Chitosanstabilized Nanoparticles Ag/Cu, Ag/Co with Fungicidal Properties

“…The morphology of bimetallic complexes in the presence of polymers depends on various factors. For example, it was shown that the morphology of "foamy" complexes with chitosan and polystyrene block (4-vinylpyridine)] PSP-4-PVP in the presence of Au/Ag depends on both the nature of the polymer and the molar ratio of the polymer / metal salt [20][21][22]. Polymer PSP-4-PVP in a 1:1 ratio form the most porous morphologies.…”

OXIDATION FACILITY BY A TEMPERATURE DEPENDENCE ON THE METAL NOBLE NANOSTRUCTURED M°/MxOy PHASE PRODUCTS USING A SOLID STATE METHOD: THE CASE OF Pd

“…The application of nanostructured materials to electronic solidsate devices or to high temperature technology requires, however, adequate solid-state methods for obtaining nanostructured materials [15][16][17][18][19][20]. Recent studies reported that the evaporation of solvent to obtain Au nanoparticles in solid-state, for an adequate incorporation to a solid-state device -for instance-, results in 3D Au superstructures with properties different to those of Au nanostructures [21][22][23][24]. Then, the development of new solid state methods to prepare metallic nanostructured materials is a constant challenge.…”