The five shades of oleylamine in a morphological transition of cobalt nanospheres to nanorods - Sorbonne Université Accéder directement au contenu
Article Dans Une Revue Nanoscale Année : 2021

The five shades of oleylamine in a morphological transition of cobalt nanospheres to nanorods

Résumé

Understanding of cobalt nanorods’ (Co NRs) formation still remains challenging when it comes to enhancing their anisotropic properties applicable in magnetic or catalytic areas. Herein, we propose a mechanism for the morphological transition from spherical cobalt nanoparticles (NPs) to Co NRs over time (9 h) in a mixture of [CoCl(PPh3)3] and oleylamine (OAm). In the literature, we described how spherical Co NPs are synthesized via a disproportionation process. Based on in situ and pseudo in situ observations, two steps of this unique mechanism are characterized first by the dissolution of the spheres and then the regrowth in rods’ shape in the presence of an OAm template. Furthermore, ex situ experiments show that these steps are the result of interdependent reactions occurring between Co NPs, cobalt(II) and OAm. The latter plays numerous roles in this synthesis: as a surfactant, a disproportionation promoter, and a hydrogen source allowing the reduction of cobalt(II) complexes; its ammonium salt derivative is involved in oxidative etching of Co NPs and it promotes the anisotropic growth in NRs. These coupling actions of reduction and etching generate two cobalt reservoirs of nuclei under thermodynamic conditions.

Domaines

Matériaux
Fichier principal
Vignette du fichier
Moisset et al. - 2021 - The five shades of oleylamine in a morphological t.pdf (3.92 Mo) Télécharger le fichier
Origine : Fichiers produits par l'(les) auteur(s)

Dates et versions

hal-03269446 , version 1 (24-06-2021)

Identifiants

Citer

Arthur Moisset, Alexandre Sodreau, Anthony Vivien, Caroline Salzemann, Pascal Andreazza, et al.. The five shades of oleylamine in a morphological transition of cobalt nanospheres to nanorods. Nanoscale, 2021, 13, pp.11289-11297. ⟨10.1039/D1NR01502H⟩. ⟨hal-03269446⟩
181 Consultations
145 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More