Parylene C coated microelectrodes for scanning electrochemical microscopy

Research output: Contribution to journalArticleScientificpeer-review

Researchers

  • Fernando Cortes-Salazar
  • Haiqiang Deng
  • Pekka Peljo
  • Carlos M. Pereira
  • Kyösti Kontturi
  • Hubert H. Girault

Research units

  • Swiss Federal Institute of Technology Lausanne
  • University of Porto

Abstract

Herein, we present a simple microelectrode preparation methodology consisting in coating a platinum wire or a carbon fiber with a thin insulating Parylene C film (e.g. 1-10 mu m), to produce SECM probes with a small and constant probe RG (i.e. ratio between the radius of the insulating sheath and the radius of the active electrode area). After exposition of a fresh active electrode area by blade cutting, a disc shaped electrode is obtained thanks to a protective hot mounting wax layer that avoids Parylene C coating deformation and is easily removed with acetone. Stiffness and straightness of the probe can be tuned by modifying the Parylene C coating thickness and the length of the carbon fiber or platinum wire. This simple electrode preparation method is highly reproducible (c.a. > 90%). The prepared Parylene C coated microelectrodes were characterized by optical microscopy, cyclic voltammetry, scanning electrochemical microscopy (SECM) approach curves and finally applied to SECM imaging of Pt band structures in contact-less and contact mode. (C) 2013 Elsevier Ltd. All rights reserved.

Details

Original languageEnglish
Pages (from-to)22-29
Number of pages8
JournalElectrochimica Acta
Volume110
Issue number22-29
Publication statusPublished - 1 Nov 2013
MoE publication typeA1 Journal article-refereed

    Research areas

  • Parylene C coating, Microelectrode fabrication, Scanning electrochemical microscopy, ATOMIC-FORCE MICROSCOPY, SELF-ASSEMBLED MONOLAYERS, AIR/WATER INTERFACE, SECM, FABRICATION, PROBES, ULTRAMICROELECTRODES, MODE, TIP, ELECTRODES

ID: 10377306