BIBLIOS

Tipo
Artigos em Revista

Tipo de Documento
Artigo Completo

Título
Attachment of Noble Metal Nanoparticles to Conducting Polymers containing Sulphur -preparation conditions for enhanced electrocatalytic activity

Participantes na publicação
Virginia C Ferreira (Author)
Dep. Química e Bioquímica
Dep. Química e Bioquímica
CQB
A.I. Melato (Author)
A.F. Silva (Author)
L.M. Abrantes (Author)

Resumo
Taking advantage of the spontaneous deposition of noble metals on polymers containing sulphur, the inclusion of gold and platinum in poly(3-methylthiophene) and poly(3,4-ehylenedioxythiophene) (PEDOTh) layers, achieved by immersion of the polymer into the metal nanoparticles suspension, is reported in the present work. Platinum and gold nanoparticles (NPs), with diameters between 3 and 17 nm, have been prepared from colloidal methods (citrate or borohydride reduction in the presence of citrate capping agent) and characterized by transmission electron microscopy, ultraviolet–visible spectrophotometry and X-ray diffraction (XRD). The electropolymerization was carried out under potentiostatic and potentiodynamic conditions, imparting distinct morphologies, as revealed by atomic force microscopy. After polymer films immersion in the colloidal solutions, evidence of the NPs confinement and distribution was provided by XRD analysis and scanning electron microscopy. For thin layers, the quantity of attached metal NPs could be estimated from quartz crystal microbalance data collected throughout the films immersion.The influence of the polymer type and morphology, NPs nature, size and incorporated amount on the electrocatalytic activity of the so-prepared modified electrodes towards the hydrazine oxidation, in phosphate buffer solution, has been investigated by cyclic voltammetry. The results clearly show the superior properties of potentiodynamically prepared PEDOTh films attaching very small (3 nm) freshly prepared Pt-NPs.


Instituição
FACULDADE DE CIÊNCIAS DA UNIVERSIDADE DE LISBOA

Suporte
ELECTROCHIMICA ACTA

Identificadores da Publicação
ISSN - 0013-4686



Identificadores do Documento
DOI - https://doi.org/10.1016/j.electacta.2010.11.033

Identificadores de Qualidade
SCIMAGO Q1 (2016) - 1.355 - Electrochemistry
SCOPUS Q1 (2011) - 1.621 - Electrochemistry
Web Of Science Q1 (2017) - 5.116 - ELECTROCHEMISTRY - SCIE

Keywords
Electrocatalytic oxidation Gold and platinum nanoparticles Electropolymerization Sulphur-containing polymers Hydrazine

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