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Precise Electrochemical Sizing of Individual Electro-Inactive Particles

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All-Diamond Microelectrodes as Solid State Probes for Localized Electrochemical Sensing.

Eduardo L Silva¹, Cristol P Gouvêa², Marcela C Quevedo¹

¹†CICECO - Aveiro Institute of Materials, Department of Materials and Ceramic Engineering, University of Aveiro, 3810-193 Aveiro, Portugal.

Analytical Chemistry

|June 10, 2015

Summary

This study presents the first all-diamond microprobe for electrochemical sensing. Fabricated using chemical vapor deposition, it shows promise for localized corrosion studies.

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Published on: January 6, 2016

Area of Science:

Materials Science
Electrochemistry
Corrosion Science

Background:

Boron-doped diamond (BDD) shows potential as an electrochemical sensor material.
Undoped diamond offers superior chemical stability compared to conventional insulators.
Microelectrodes are crucial for localized electrochemical measurements.

Purpose of the Study:

To demonstrate the fabrication of a novel all-diamond microprobe.
To evaluate the electrochemical performance of the microprobe.
To assess the microprobe's applicability in studying localized corrosion.

Main Methods:

Fabrication of a microelectrode (ME) with inner BDD and outer undoped diamond layers via chemical vapor deposition (CVD).
Focused ion beam (FIB) cutting to expose the BDD disk.
Cyclic voltammetry to characterize the electrochemical response.
Scanning amperometry to map oxygen distribution during galvanic corrosion.

Main Results:

Successful fabrication of an all-diamond microprobe with distinct BDD and undoped diamond layers.
Demonstration of ferrocenemethanol redox reaction at the BDD microdisk.
Confirmation of the outer layer's insulating properties via boron diffusion barrier.
Successful application in mapping oxygen distribution above an Al-Cu-CFRP galvanic corrosion cell.

Conclusions:

The developed all-diamond microprobe is a viable tool for electrochemical sensing.
The microprobe exhibits excellent chemical stability and electrochemical activity.
This technology holds significant potential for advanced localized corrosion analysis.