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Experimental performance of the IDA electrode, with a small width (3 µm and 2 µm) is compared with the 10 um width IDA electrode.
Also, the collection efficiency was compared for the three types of the IDA electrodes.

  • IDA Electrode 3 µm
  • IDA Electrode 2 µm

More fine IDA (Pt/Au) Electrode has been developed. Its 3 µm pitch working electrodes significantly increase redox cycle and allow researchers to perform ultra-sensitive measurement.

IDA Au (3 µm)
IDA 3umIDA 3um

IDA Pt (3 µm)

We recommend to apply Ag/AgCl ink to a reference electrode in order to stabilize potential of the electrode.

Technical data concerning IDA Electrode 3 µm

Fig. 1 -- Accuracy

A CV curve obtained by 3 µm IDA Electrode Au [A] mirrored that of 3 µm IDA Electrode Au [B], which means both of the IDA Electrodes were produced very accurately.
IDA Electrode Au 3um CV Curves -- Single Mode

  • Left: 3 µm IDA Electrode Au [A]; Right: 3 µm IDA Electrode Au [B]
  • Sample: ferrocene methanol (1 mM/ 0.5 M NaCl solution)
  • Mode: Single
  • Sweep Rate: 30 mV/s

Fig. 2 -- CV by Dual mode

IDA Electrode 3um Au CV Curve -- Dual Mode

  • Mode: Dual
  • Sweep Rate at G-Electrodes: 10 mV/s
  • Applied Voltage to C-Electrodes: -0.2 V

Fig. 3 & 4 -- Comparison of 3 µm IDA Au with 10 µm by Dual Mode

For 3 µm electrode,　the limiting current of ferrocene methanol by CV Dual mode was 8 times as much as of the peak current by Single mode, while this ratio for 10 µm electrode was about 4.　This means large increase of the redox cycle.

IDA Electrode 3um CV Curve -- Dual Mode
Figure 3.
IDA Electrode: 3 µm Au
Sweep Rate: 10 mV/s		 IDA Electrode 10um CV Curve -- Dual Mode
Figure 4.
IDA Electrode: 10 µm Au
Sweep Rate: 10 mV/s
*Larger area in 10 µm IDA electrode gives the appearance as if its absolute current is larger than 3 µm of IDA


Fig. 5 -- Capture Efficiency

Figure 5 shows a result of LSV Dual mode measurement. Its collection efficiency was proved to be 96.4% by our calculation from limiting current of Collector electrodes and Generator electrodes.

IDA Electrode 3um LSV Curve -- Dual Mode

  • Method: LSV (Linear Sweep Voltammetry)
  • Mode: Dual
  • Sample: ferrocene methanol (1 mM/0.5 M NaCl solution)
  • Sweep Rate: 10 mV/s

Besides CV and LSV electrochemical techniques, our IDA electrode is available for various electrochemical measuring techniques such as chronoamperometry, normal pulse voltammetry, differential pulse voltammetry etc.
Researchers can obtain more insights by using IDA electrodes.

More fine IDA (Pt/Au) Electrode has been developed. Its 2 µm pitch working electrodes significantly increase redox cycle and allow researchers to perform high-ultra-sensitive measurement.
IDA(Interdigitated Array) Electrode Au 2 um

Technical data concerning IDA Electrode 2 µm

A CV curve obtained by 2 µm IDA Electrode Au.

CV by Single mode

CV (Single) Using Au 2 um

  • Sample: 1 mM ferrocene methanol (0.5 M NaCl solution)
  • Mode: Single
  • Sweep Rate: 10 mV/s

CV by Dual mode

CV (Dual) Using Au 2 um

  • Sample: 1 mM ferrocene methanol (0.5 M NaCl solution)
  • Mode: Dual
  • Sweep Rate at G-Electrodes: 10 mV/s
  • Applied Voltage to C-Electrodes: -0.05 V
    Its collection efficiency was proved to be 97% by our calculation from limiting current of Collector electrodes and Generator electrodes.

Capture Efficiency

Compared with IDA Au 10 µm and 3 µm, the capture efficiency of the 2 µm is higher, 93% for 10 µm and 95% for 3 µm.
For 2 µm electrode,　the limiting current of ferrocene methanol by CV Dual mode was 11 times as much as of the peak current by Single mode, while this ratio for 10 µm and 3 µm electrode were about 4 and 7.5, respectively.　This means large increase of the redox cycle.


IDA electrode line up

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∗
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.~

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