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Needle-type ultra micro silver/silver chloride reference electrode for use in micro-electrochemistry
Tatsuya Kitade1, Keisuke Kitamura, Shigehiko Takegami
1Kyoto Pharmaceutical University, 5 Nakauchi-cho, Misasagi, Yamashina-ku, Kyoto 607-8414, Japan. kitade@mb.kyoto-phu.ac.jp
Summary
A novel micro silver/silver chloride reference electrode was developed for intracellular measurements. This stable and repeatable electrode is suitable for microscale electrochemical applications.
Area of Science:
- Electrochemistry
- Materials Science
- Nanotechnology
Background:
- Accurate electrochemical measurements in biological systems require stable reference electrodes.
- Existing microelectrodes often face challenges with stability and applicability in confined environments.
- Development of miniaturized reference electrodes is crucial for advanced analytical techniques.
Purpose of the Study:
- To construct and characterize a needle-type ultra-micro silver/silver chloride reference electrode.
- To evaluate the electrode's performance in small-volume electrochemical applications.
- To ensure stability and repeatability for reliable measurements.
Main Methods:
- Fabrication of a micro reference electrode with a micro capillary (0.5 +/- 0.2 microm inner diameter).
- Use of agar gel with 3.33 mol/L potassium chloride as a salt bridge.
- Electromagnetic shielding of the measurement cell and wire lead.
- Internal electrolyte solution: 3.3 mol/L potassium chloride aqueous solution with silver chloride.
Main Results:
- The micro reference electrode demonstrated excellent potential stability and repeatability.
- Stable potential was maintained for 7 days post-fabrication.
- Constant electrode potential and stability were observed across a pH range of 5-9.
- Measurements against a commercial pH glass electrode showed good accordance with the Nernst equation.
Conclusions:
- The developed ultra-micro silver/silver chloride reference electrode is suitable for intracellular and microscale electrochemical applications.
- The electrode offers excellent stability and repeatability, crucial for reliable measurements in confined environments.
- This technology advances electrochemical sensing in fields like electrochemical scanning tunneling microscopy and micro-Total Analysis Systems (micro-TAS).