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 language | English |
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Pages (from-to) | 22-29 |
Number of pages | 8 |
Journal | Electrochimica Acta |
Volume | 110 |
Issue number | 22-29 |
DOIs | |
Publication status | Published - 1 Nov 2013 |
MoE publication type | A1 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