Abstract
In this work it is reported, for the first time, the electrochemical modification of titanium dioxide (TiO2) nanotubes (NTs), previously formed onto a titanium metal surface (Ti/TiO2NTs) by anodization in an aqueous solution containing glycerol and ammonium fluoride, NH4F, with gold (AuNPs) or silver (AgNPs) nanoparticles (NPs) electrodeposited from their respective metallic ions dissolved in reline deep eutectic solvent. The nucleation and growth mechanism of these NPs and its corresponding kinetics were assessed from analysis of experimental potentiostatic current transients (i-t plots). In both cases, it was found that formation of the metal nanoparticles, MeNPs, occurs by multiple three-dimensional nucleation with diffusion-controlled growth. The surface of the MeNPs modified Ti/TiO2NTs were characterized by XRD, SEM and XPS that allowed to demonstrate the formation of quasi spherical MeNPs formed by metallic gold or metallic silver, that in general depicted 100 nm average diameter.
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