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.

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.
Compared with single mode, dual mode measurement has increased in 30 times the current value.	Zoom

The voltammograms of ferrocene samples ((a),(c): 10 µL , (b),(d): 0.2 µL) using IDA electrode ((a),(b): Dual mode; (c),(d): Single Mode) are shown below. As they indicate, measuring mode makes obvious difference on their responses. Dual mode (a),(b) reinforce reduction current at collector electrodes with increase of oxidation current at generator electrodes, in addition, the current value is not affected by the sample volume, only depends on the concentration of the sample. At the measurement (d), comparing with (ｃ), the current response is scarcely obtained, because the sample was consumed during the experiment, indicating that electrode response current of single mode is greatly dependent on the amount of sample solution.

	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

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.

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.