Amperometric Detection of Nitrogen Oxides by Means of Interdigitated Array Electrodes

Toda, Kei; Hashiguchi, Shuichi; Oguni, Seiki; Sanemasa, Isao

doi:10.2116/analsci.13.981

Cited by 13 publications

(13 citation statements)

References 28 publications

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“…In the first study of gas sensing using IDA electrodes 8 , the reaction system on the electrodes was complicated, because there were many reactions concerned with redox of the analytes (NO x ) and their products, and their standard potentials were similar to one another. In contrast, in this study, the hydrogen-sensing properties of the IDA electrodes were examined, and it was expected that simple redox cycles (Eq.…”

Section: Resultsmentioning

confidence: 99%

“…8 The amplification rate could be improved dramatically by miniaturizing the IDA electrodes. However, it is difficult to fabricate fine electrode patterns on a flexible and uneven membrane; at least this is the present situation.…”

Section: Hmentioning

confidence: 99%

“…2 Response characteristics of the Pt and Au IDA electrodes IDA electrodes made of Pt and Au were fabricated on a gas-permeable membrane and were set in the electrolyte system, as described before. 8 The response to hydrogen was measured through potentiostatic electrolysis. Potentials of the generator and the collector were -0. allowed the electrodes to be only slightly separated from the gas phase.…”

Section: Hmentioning

confidence: 99%

“…The generator current increases when a suitable potential is applied to the collector (a dual-mode), compared to a single-mode when the collector is electrically open. In a previous study 8 , IDA electrodes were applied to gas detection for the first time. The electrodes were fabricated on a gas-permeable membrane in order to obtain good response to the gases (NO x ) through improved conventional photolithography.…”

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confidence: 99%

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A Planar Gas Sensor Combined with Interdigitated Array Electrodes

et al. 1999

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Interdigitated array (IDA) electrodes are used for the determination of components contained in aqueous solutions with high sensitivity. [1][2][3][4][5][6][7] Redox cycles are generated between the two working electrodes; they are called the generator and the collector, and are placed close to each other. The generator current increases when a suitable potential is applied to the collector (a dual-mode), compared to a single-mode when the collector is electrically open. In a previous study 8 , IDA electrodes were applied to gas detection for the first time. The electrodes were fabricated on a gas-permeable membrane in order to obtain good response to the gases (NO x ) through improved conventional photolithography. It was confirmed that the IDA electrodes are useful in a gas-detection system, as well as in solution systems. Generally, the gap and width of the electrodes should be small in order to generate a large number of redox cycles. However, it was difficult to fabricate fine patterns on the gas-permeable membrane, because the membrane was flexible and its surface was not flat. On the other hand, it is already possible to fabricate fine IDA patterns on a hard and flat substrate and are already being marketed. However, if these electrodes fabricated on substrate are set in an electrolyte solution, they do not come into contact with the membrane. Therefore, it is said that the sensitivity and response speed are poor. Accordingly, we experimented with a new method of applying IDA electrodes to a gas-sensing system. We call it a planar IDA gas sensor. A piece of filter paper containing an electrolyte solution was put on IDA electrodes, which were fabricated on a glass substrate. This gas sensor was very easy to construct. A similar planar sensor had been reported for amperometric sensing of oxygen.9 It was developed as a low-cost and disposable sensor, and applied to glucose sensing. A planar sensor is expected to be more useful in complicated detection systems i.e. using IDA electrodes, which was confirmed after being used in a hydrogen-detection system. ExperimentalPropylene carbonate (PC) was purchased from Nacalai Tesque Inc. Tetraethylammonium perchlorate (TEAP) was prepared from tetraethylammonium bromide and perchloric acid, both of which were obtained from Wako Chemical Co. The precipitate of TEAP was purified by recrystallization from water and stored in an evacuated desiccator after baking at 100˚C. A PC solution containing 0.1 M TEAP was prepared as an electrolyte.A planar IDA gas sensor was prepared based on available IDA electrodes (No. 2047 from BAS). The width and gap of the electrodes were 10 µm and 5 µm, respectively. The valid length of the electrode was 2 mm, and the number of electrodes was 65 pairs. Keywords Interdigitated array electrodes, redox cycles, hydrogen gas sensor Fig. 1 Structures of planar gas sensors combined with IDA electrodes. The IDA electrodes used were fabricated on a glass substrate. The bandwidth of the generator and the collector were 10 µm, and the gap between them wa...

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Section: Resultsmentioning

confidence: 99%

Section: Hmentioning

confidence: 99%

Section: Hmentioning

confidence: 99%

mentioning

confidence: 99%

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A Planar Gas Sensor Combined with Interdigitated Array Electrodes

et al. 1999

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“…Such IDA electrodes have been applied for electrochemical detection of enzyme activity, [8][9][10][11][12][13] and have also been fabricated on a gas-permeable membrane to produce a gas-sensing system. 17 In the present study, IDA electrodes were incorporated into a flexible device for electrochemical detection in narrow spaces. An epoxy-based negative photoresist (SU-8) was chosen for the flexible substrate because it is a common material with wellknown properties.…”

Section: Introductionmentioning

confidence: 99%

SU-8-based Flexible Amperometric Device with IDA Electrodes to Regenerate Redox Species in Small Spaces

et al. 2014

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A flexible sensor based on SU-8 photoresist was fabricated and its electrochemical performance was investigated using cyclic voltammetry. The device consisted of interdigitated array (IDA) electrodes on an SU-8 layer. It exhibited a clear electrochemical response during redox cycling of ferrocenemethanol at the IDA electrodes. Since the device was flexible, it could be inserted into a narrow bent space to monitor electrochemical responses. The observed electrochemical behavior was found to be consistent with that predicted by simulations based on redox compound diffusion.

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Electrochemical Sensors for the Detection of Superoxide and Nitric Oxide — Two Biologically Important Radicals

Lisdat¹

2004

Ultrathin Electrochemical Chemo- And Biosensors

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Amperometric Detection of Nitrogen Oxides by Means of Interdigitated Array Electrodes

Cited by 13 publications

References 28 publications

A Planar Gas Sensor Combined with Interdigitated Array Electrodes

A Planar Gas Sensor Combined with Interdigitated Array Electrodes

SU-8-based Flexible Amperometric Device with IDA Electrodes to Regenerate Redox Species in Small Spaces

Electrochemical Sensors for the Detection of Superoxide and Nitric Oxide — Two Biologically Important Radicals

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