Ultra-Micro Electrode Structure for Oxidation-Resistant SECM Probes
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Solution Overview
Problem
Existing ultra-micro electrodes for scanning electrochemical microscopes face issues with oxidation and brittleness when manufacturing smaller diameters, leading to difficulties in analyzing fine crystal grains and electrochemical reactions.
Innovation Solution
The method involves using a conductive wire with superior oxidation resistance, such as stainless steel containing nickel and chromium, inserted into an insulating member, and forming a groove with a filling layer through etching and plating to create an ultra-micro electrode suitable for electrochemical analysis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the diameter of the conductive wire is reduced to manufacture ultra-micro electrodes with smaller diameters, then the spatial resolution and measurement precision are improved, but the oxidation resistance deteriorates and the wire becomes brittle
Solution Approach 1:
The patent uses a composite structure consisting of a glass capillary tube and a conductive wire. The glass provides oxidation resistance and structural stability, while the conductive wire provides electrical conductivity. This composite approach allows the conductive wire to be made very thin (1-10 μm) for high spatial resolution without the wire being exposed to oxidation, as it is protected by the glass capillary.
Solution Approach 2:
The glass capillary tube creates a protected environment around the conductive wire, isolating it from oxidative conditions. The glass acts as a barrier that prevents oxygen and moisture from reaching the conductive wire surface, effectively creating an inert atmosphere that prevents oxidation even when the wire diameter is reduced to ultra-micro dimensions.
2Measurement precision
If the diameter of the conductive wire is reduced to manufacture ultra-micro electrodes with smaller diameters, then the spatial resolution is improved, but the mechanical strength deteriorates causing brittleness
Solution Approach 1:
The glass capillary tube provides mechanical strength and structural support to the ultra-thin conductive wire. The wire diameter can be reduced to 1-10 μm for high spatial resolution while the glass capillary maintains the overall structural integrity and prevents the wire from becoming brittle or breaking during handling and use.
Solution Approach 2:
The glass capillary tube acts as a protective shell that encloses and protects the ultra-thin conductive wire. This shell structure allows the wire to be extremely thin without compromising the mechanical strength of the overall electrode assembly, as the glass provides the necessary structural support and protection.
3Ease of manufacture
If heat is applied to the central portion of the glass tube to form a necking portion, then the manufacturing process is enabled, but coarse crystal grains are formed on the conductive wire surface
Solution Approach 1:
The glass capillary tube serves as an intermediary that protects the conductive wire during the heating process. When heat is applied to form the necking portion, the glass tube shields the conductive wire from direct thermal exposure and rapid cooling that would cause coarse crystal grain formation. The glass allows controlled heating while preventing the thermal shock that leads to poor crystal structure.
4Ease of manufacture
If heat is applied to the central portion of the glass tube to form a necking portion, then the manufacturing process is enabled, but oxidation of the conductive wire is intensified
Solution Approach 1:
The glass capillary tube creates a protected environment that prevents oxidation during the heating process. When heat is applied to form the necking portion, the glass tube acts as a barrier that isolates the conductive wire from atmospheric oxygen, preventing oxidation even at elevated temperatures. This allows the manufacturing process to proceed without compromising the oxidation resistance of the conductive wire.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution prevents oxidation and crumpling of the conductive wire, enabling precise electrochemical analysis and increased usability as a probe tip or specimen for scanning electrochemical microscopes.
Implementation Method 1
preparing a conductive wire formed of a conductive material which has an oxidation resistance that is greater than an oxidation resistance of copper
Implementation Method 2
manufacturing half-finished products by applying heat and an external force to the insulating member which has the conductive wire inserted therein to stretch the insulating member and the conductive wire
Implementation Method 3
applying tension forces to opposite ends of a glass tube having a conductive wire inserted therein, and a central portion of the glass tube is heated using, for example, a laser, etc. to form a necking portion at a central portion
Implementation Method 4
forming a filling layer by filling the groove with a conductive material by a plating process
Data Source
AI summary
An ultra-micro electrode that performs electrochemical analysis and a method of manufacturing the same is provided. The method includes preparing an insulating member having a capillary shape with a hollow region, preparing a conductive wire including a conductive material with an oxidation resistance greater than an oxidation resistance of copper, inserting the conductive wire into the hollow region of the insulating member, manufacturing half-finished products by applying heat and an external force to the insulating member having the conductive wire inserted therein to stretch the insulating member and the conductive wire so that a central portion of the insulating member is thin and the insulating member and the conductive wire are ruptured at central portions thereof, forming a groove by etching the conductive wire located on a ruptured surface of each half-finished product, and forming a filling layer by filling the groove with a conductive material by a plating process.