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Published on: August 5, 2021
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Note: benign and reproducible preparation of titanium tips.
A Awez Mohammad1, Z L Arnott1, Y Wang1
1Department of Chemistry and Chemical Biology, McMaster University, 1280 Main St. W., Hamilton, Ontario L8S 4M1, Canada.
The Review of Scientific Instruments
|March 6, 2014
Summary
A novel one-step electrochemical etching method using a non-aqueous electrolyte simplifies titanium tip fabrication. This efficient process avoids oxide layer issues and eliminates pre/post-polishing, yielding tips below 100 nm.
Area of Science:
- Materials Science
- Electrochemistry
- Surface Engineering
Background:
- Titanium tip fabrication via electrochemical etching is often impeded by a persistent oxide layer.
- Existing methods may require multiple steps, including pre- and post-electropolishing, increasing complexity and time.
Purpose of the Study:
- To introduce a simplified, one-step electrochemical etching technique for fabricating titanium tips.
- To overcome the challenge of oxide layer formation during titanium tip etching.
- To demonstrate the electropolishing capability of a novel electrolyte system.
Main Methods:
- Utilizing a direct current (dc) etching process in a non-aqueous electrolyte.
- Employing a benign etchant solution of 1M sodium chloride (NaCl) in ethylene glycol.
- Operating the etching process at a controlled voltage of 20 V.
- Implementing current cut-off control for precise tip radius determination.
Main Results:
- Successfully fabricated titanium tips with radii below 100 nm using current cut-off control.
- Achieved tip radii approaching 150 nm without the use of current cut-off control.
- The NaCl-ethylene glycol electrolyte demonstrated inherent electropolishing capabilities, negating the need for separate electropolishing steps.
Conclusions:
- The presented one-step dc etching method offers a simple and efficient approach to titanium tip fabrication.
- The non-aqueous electrolyte system effectively prevents oxide layer formation and integrates electropolishing.
- This technique significantly streamlines the fabrication process, reducing complexity and enhancing efficiency for producing nano-scale titanium tips.
