Electrodeposición de nanopartículas de cobre sobre hopg. Influencia del electrolito soporte
Avances en Ciencias e Ingeniería(2020)
Abstract
espanolSe estudio la influencia del electrolito soporte en las etapas iniciales de la electrodeposicion de cobre sobre grafito pirolitico altamente orientado, mediante tecnicas electroquimicas convencionales. Las tecnicas de microscopia SEM y AFM se emplearon para la caracterizacion de los depositos generados. El proceso de electrocristalizacion se evaluo a partir de soluciones de CuSO4 con distintos electrolitos soportes: Na2SO4, H2SO4, y la combinacion de ambos. Los resultados voltamperometricos indicaron la respuesta tipica de un proceso de nucleacion y crecimiento controlado por difusion. El mayor valor del coeficiente de difusion se encontro para la solucion conteniendo Na2SO4. Las imagenes SEM y AFM revelaron que el mecanismo de nucleacion del Cu es de tipo progresivo. La densidad de nucleos formados resulto menor para el electrolito combinado. Se evidencio, en el caso de la solucion con Na2SO4, la formacion de aglomerados de particulas, mientras que para la solucion con H2SO4, se observaron, ademas, estructuras dendriticas. EnglishThe influence of the supporting electrolyte on the initial stages of copper electrodeposition on high oriented pyrolytic graphite was studied, by means of conventional electrochemical techniques. SEM and AFM microscopy techniques were used for the characterization of the generated deposits. The electrocrystallization process was evaluated from CuSO4 solutions with different supporting electrolytes: Na2SO4, H2SO4, and the combination of both. The voltamperometric results indicated the typical response of a diffusion-controlled nucleation and growth process. The highest diffusion coefficient value was found for the Na2SO4 containing solution. SEM and AFM images revealed that the nucleation of Cu follows a progressive mechanism. The density of formed nuclei was lower for the combined electrolyte. In the case of the solution with Na2SO4, the formation of particle agglomerates was evidenced, while for the solution with H2SO4, dendritic structures were also observed.
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Key words
nanoparticles,electrodeposition,copper,supporting electrolyte
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