Kinetic Impact of Pt Seed Morphology on the Highly Controlled Growth of Ni-based Nanostructures

Carmen Vázquez-Vázquez, Marcos Sanlés-Sobrido, Benito Rodríguez-González, Miguel Spuch-Calvar, Manuel Bañobre-López, José Rivas, Moisés Pérez-Lorenzo, Verónica Salgueiriño, and Miguel A. Correa-Duarte

RSC Adv. 2015, 5, 52033‒52040

A Pt seed-mediated growth method for the synthesis of Ni/NiO and Ni/Ni(OH)2 nanocomposites has been designed so that the morphology and composition of the final materials can be kinetically tailored by a rational choice of the type of seed. Spherical and dendritic Pt nanoparticles provide rather different architectures depending on the different catalytic activity they can exert. Thus, the Pt nanoparticle initial morphology establishes the conditions for the initial nickel deposition and consequently determines the subsequent autocatalytic growth of the magnetic nanocomposite. Pt seed morphology and reaction conditions reveal the autocatalytic nickel deposition kinetics as a critical factor in the tunability of morphology and composition of nickel-based nanostructures, offering a great opportunity to modulate the final properties of these materials.