Parylene C coated microelectrodes for scanning electrochemical microscopy

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

*Corresponding author for this work

    Research output: Contribution to journalArticleScientificpeer-review

    11 Citations (Scopus)

    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.

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

    Keywords

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

    Cite this