Determination of surface amine groups on amorphous carbon nitride thin films using a one step covalent grafting of a redox probe

Autor(es)

Jribi, S. ^[1] ; Cordoba de Torresi, S. I. ^[2] ; Augusto, T. ^[2] ; Cachet, H. ^{[3, 1]} ; Debiemme-Chouvy, C. ^{[3, 1]} ; Deslouis, C. ^{[3, 1]} ; Pailleret, A. ^{[3, 1]}

Afiliação do(s) autor(es)

^[1] Jribi, Jr., S., LISE, CNRS, UMR 8235, F-75005 Paris - France

^[2] Univ Sao Paulo, Inst Quim, BR-05513970 Sao Paulo - Brazil

^[3] Jribi, Jr., S., Univ Paris 06, Univ Paris 04, UMR 8235, Lab Interfaces & Syst Electrochim, F-75005 Paris - France

• Tipo de documento: Artigo Científico
• Fonte: Electrochimica Acta; v. 136, p. 473-482, AUG 1 2014.
• Citações Web of Science: 3

Resumo

A fluorocarbonyl terminated ferrocene based redox probe was synthesized and characterized using infrared spectroscopy and nuclear magnetic resonance. It was then successfully grafted on various amorphous carbon nitride (a-CNx) samples (0.12 <= x <= 0.27) via the formation of a -CO-NH- type linkage with surface amine groups, whose spontaneous formation on the surface of a-CNx materials was thus proved and exploited. Cyclic voltammetry experiments were carried out in an acidic aqueous solution in the presence of this freely diffusing redox probe, in order to identify its electrochemical behavior. By comparison, CV experiments carried out on the modified a-CNx electrodes in the same blank electrolytic solution undoubtedly confirmed the presence of electroactive sub-monolayers, in spite of distortions of the resulting voltammograms. These latter were shown to reflect the influence of bulk atomic nitrogen content on the electrochemical reactivity of a-CNx materials. The grafted surface amine percentage deduced from the charge passed during oxidation of grafted ferrocene moieties was found to decrease from 6.5% for a-CN0.12 down to 1.1% for a-CN0.27. This trend is expected to reflect the trend in surface concentration of reactive amine groups as a function of bulk atomic nitrogen content. (C) 2014 Elsevier Ltd. All rights reserved. (AU)

• Processo FAPESP: 09/53199-3 - Reconhecimento molecular e armazenamento de energia: estudos fundamentais do efeito de geometria, tamanho e síntese na otimização das propriedades químicas de materiais eletroativos
• Beneficiário: Roberto Manuel Torresi
• Modalidade de apoio: Auxílio à Pesquisa - Temático