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Interdigitated Array (IDA) electrode

Description

Interdigitated Array (IDA) electrode is an electrode developed for electrochemical measurements to be performed in a very small quantity of the sample. IDA electrode could be applied for the detection and reaction analysis of the compounds in a small quantity of the sample. IDA electrode is a microelectrode pattern fabricated by using the lithography technology. The Electrodes are composed of 65 pairs. In each one of the pair has a function of the oxidation and reduction electrodes.

 

 

・High sensitivity CV measurement
・Very small sample quantity for EC measurement
・Small and integrated
・Fast response
・Conductivity measurement
Schematic diagram of the electrode

 

 

Application example

 

・HPLC measurement electrode
・Electrochemical measurement electrode
・Bio-sensor and chemical sensor electrode
・Chemically modified electrode
・Chemical reaction parameter monitoring electrode

Expanded diagram of the IDA electrode

 

 

 

 

CV measurement using Interdigitated Array Electrodes

IDA Electrode is a pair of band electrode combined and meshes with each other as a generator electrode and collector electrode, therefore it is possible to make an electrochemical redox cycle upon the electrode as showed in figure.
By occurring the redox cycle on electrode increasing electrolysis current to raise measurement sensitivity. In experiment using common electrodes to analyze a small quantity of sample solution, the sample will consumed and exhausted due to electrolysis. However using this Interdigitated array electrode, the oxidation-reduction reaction occur repeatedly so the sample solution will not exhausted.

redox-cycling reaction on IDA Electrode Redox cycle
keyword is diffusion and concentration slope

Substance to be oxidized/reduced into the sample solution is transported by diffusion to the electrode surface. Diffusion is the physical phenomenon of the molecular species transport from high to low concentrated region.

Interdigitated 65 pairs of generator/collector electrodes set off electrochemical RedOx cycling continuously as shown in Fig.1. This reaction significantly boosts sensitivity of the electrode. Furthermore, samples are preserved when Dual (Red-Ox) Mode is chosen - Not like as Single Mode eats up samples at measurements.

In single mode, the decrease of current response become very small　because of the samples substance consumption due to the electrolysis.		 Single mode
 
Compared with single mode, dual mode measurement has increased in 30 times the current value. Experimental data performed by using CHI820B 
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IDA(Interdigitated Array) Electrode substrate dimension
width 12.0±0.1 mm
length 20.0±0.1 mm
thickness 0.5 mm
electrode thickness
Au 90 nm
Pt
C 1.2±0.1 μm
ITO 100 nm
adhesive layer - passivation membrane thickness
Ti approximately 10 nm
（∗only for Au and Pt）
passivation membrane about 1 μm

 

IDA electrode expanded diagram

IDA(Interdigitated Array) Electrode
Catalog No. Description Width (µm) Interval (µm) Length (mm) Number of feet (pairs) Film thickness
012125 IDA electrode (Au) 10 5 2 65 90 nm∗
012126 IDA electrode (Pt) 10 5 2 65 90 nm∗
012127 IDA electrode (Carbon) 10 5 2 65 1.2 +/- 0.1 µm
012128 IDA electrode (ITO) 10 5 2 65 100 +/- 20 nm
012129 IDA electrode (Au) 3 3 2 65 90 nm∗
012130 IDA electrode (Pt) 3 3 2 65 90 nm∗
012257 IDA electrode (Au) 2 2 2 65 90 nm∗
012258 IDA electrode (Pt) 2 2 2 65 90 nm∗
w/o passivation membrane
012259 IDA electrode (Au) without passivation membrane 10 5 2.5 65 90 nm∗
012262 IDA electrode (Pt) without passivation membrane 10 5 2.5 65 90 nm∗
012266 IDA electrode (Carbon) without passivation membrane 10 5 2.5 65 1.2 +/- 0.1 µm
012265 IDA electrode (ITO) without passivation membrane 10 5 2.5 65 100 +/- 20 nm
012260 IDA electrode (Au) without passivation membrane 3 3 2.5 65 90 nm∗
012263 IDA electrode (Pt) without passivation membrane 3 3 2.5 65 90 nm∗
012261 IDA electrode (Au) without passivation membrane 2 2 2.5 65 90 nm∗
012264 IDA electrode (Pt) without passivation membrane 2 2 2.5 65 90 nm∗
OPTION
011066 Cable kit for IDA electrode
011464 Ag/AgCl Ink for reference electrode (2.0 mL)


∗ For Au and Pt, the thickness of the titanium adhesive layer is about 10 nm, resulting in a total thickness of 100 nm.

 

 

The handling of until measurement

For the high-sensitivity detection by redox cycle using IDA electrode, dual potentiostat is required.
In addition, CS-3A Cell stand to reduce the noise, and the coating of the reference electrode portion to have the stable reference potential, applying such as silver-silver chloride ink, are recommended.

 

Handling precautions of IDA electrode


The IDA electrode is a very sensitive product. Here, some advice for the preservation and handling of IDA electrode will be described.
 

Attention for receiving the product

After receiving the product, it is recommended to test the insulation between the working electrodes using a tester.
 

Attention for opening the package

  1. When you will take out the electrode from the package, catch with the fingers at the edge of the glass substrate or pinch the glass plate carefully with tweezers. Glass substrate could break easily, so keep away from excessive force and strain.
  2. Do not touch the pattern area of the electrode directly. If you touch the pattern area, it could be peeled or break out. 
 

Attention for cleaning before use

  1. Do not clean in ultrasonic cleaner.
  2. Do not clean the electrode with strong acid or base solution.
  3. Do not clean in ozone cleaner.
  4. Do not scratch the electrode surface to avoid the pattern area conductivity break down.
  5. If you want to clean the electrode with organic solvent, only rinse with acetone or ethanol. Do not immerse the electrode in an organic solvent for long time to avoid peeling of the electrode pattern and passivation membrane.
 

Attention in measurement

  1. The electrode can not be used in high and low temperature.
  2. Do not use the electrode in strong acid or base solution.
  3. Do not apply excessive oxidation or reduction potential.
  4. Physical or chemical modification of the electrode will be for your own responsibility. We do not guarantee the electrode characteristics after modification.
  5. This electrode is assumed as disposable. Reuse of the electrode is not recommended. 
 

Attention in storage

If long-term storage, put the electrode in the case. Store the case in clean space such as desiccator, away from heat and moisture. 

CAUTION

Any defects in the appearance (ex: pinhole on lead area, burr of glass) without any influence to the measurement, are not covered under warranty.