resumo
A novel diamond based solid-contact pH-selective microelectrode is reported in the paper for the first time. The diamond films were grown on top of sharp tungsten filaments by HFCVD (Hot Filament Chemical Vapor Deposition). The pH sensitivity of the electrode is achieved via oxygen-termination of the diamond surface with RF oxygen plasma. The MEs were calibrated by zero-current chronopotentiometry registering linearity in the pH 2-12 range. The performance of the diamond microelectrode was demonstrated mapping the pH distribution over corroding Zn-Fe model galvanic cell. (C) 2013 Elsevier B.V. All rights reserved.
palavras-chave
GALVANIC CORROSION; ZN/STEEL COUPLE; HIGH-RESOLUTION; FILMS; ZN2+
categoria
Electrochemistry
autores
Silva, EL; Bastos, AC; Neto, MA; Silva, RF; Ferreira, MGS; Zheludkevich, ML; Oliveira, FJ
nossos autores
António Alexandre Cunha Bastos
Investigador Auxiliar
Eduardo Luís Trindade da Silva
Bolseiro de pós-Doutoramento
Filipe José Alves de Oliveira
Investigador Principal
Mário Guerreiro Silva Ferreira
Professor(a) Jubilado(a)
Miguel Ângelo da Costa Neto
Investigador Principal
Mikhail Zheludkevich
Investigador Principal Convidado
Rui Ramos Ferreira e Silva
Professor associadoProjectos
Enhancing Scanning Ion-Selective Electrode Technique - SISET (SISET)
Corrosion adn corrosion protection in multi-material systems (PTDC/CTM/108446/2008)
agradecimentos
E.L. Silva and M.A. Neto would like to acknowledge FCT for the grants SFRH/BD/61675/2009, and SFRH/BPD/45610/2008, respectively. This work was supported by projects PTDC/CTM/108446/2008 and PTDC/CTM-MET/113645/2009, funded by FEDER/COMPETE programmme-Portuguese Science and Technology Foundation and by the SISET project (FP7-PEOPLE-2010-IRSES Reference 269282).