Quantitative fluctuation-enhanced sensing in amperometric NO2 sensors

Kuberský, Petr; Sedlák, Petr; Hamáček, Aleš; Nešpůrek, S.; Kuparowitz, Tomáš; Šikula, Josef; Majzner, Jiří; Sedláková, Vlasta; Grmela, Lubomír; Syrový, Tomáš

doi:10.1016/j.chemphys.2014.10.021

Cited by 14 publications

(17 citation statements)

References 51 publications

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“…Thereafter, a layer of solid polymer electrolyte (SPE) consisting of 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl) imide, poly(vinylidene fluoride), 1-methyl-2-pyrrolidone, and dimethylformamide (1:1:1:5, weight) was deposited with the screen printing technique. After the drying process (24 hours at 298 K), the working electrode was printed using graphite ink for screen printing (C10903P14, Gwent Group) [6]. These sensors are referred to as "ceramics Pt/SPE/C".…”

Section: Fabrication Processes Of Our Amperometric No2 Sensorsmentioning

confidence: 99%

“…Several approaches to the measurement circuitry scheme were made in our study of current fluctuations in an amperometric sensor in either a neutral (zero NO2 concentrations) or chemical (non-zero NO2 concentrations) environment [6,30,31]. Generally, an amperometric sensor is the core component of a potentiostat circuit [27,35,36], which provides two main functions [27]: (i) controlling the voltage between the working and reference electrodes, and (ii) measuring the current flowing through the sensor, i.e.…”

Section: Measurement Circuitmentioning

confidence: 99%

“…Since a particular sensor is meant to be the part of potentiostat circuit based on an operation amplifier, we focused only on the simplest version of potentiostat based on the grounded WE configuration [27]. To minimize noise generated by other electronic components and to exclude influence of the operational amplifier, the measurement circuit consisted only of a battery, a potentiometer, a sensor and a loading resistance [6]. Fig.…”

Section: Measurement Circuitmentioning

confidence: 99%

“…Current fluctuations of a particular sensor were determined by measurement of voltage fluctuations across the loading resistor. This time-consuming technique revealed an influence of higher NO2 concentration on the power spectra of current fluctuations, It is the technique of measuring − at a minimal background noise level − the amperometric sensor fabricated by the cooperating laboratory [6].…”

Section: Measurement Circuitmentioning

confidence: 99%

“…Among various approaches, electrochemical principles show advantages over other techniques. As a part of a large and important class [3], the electrochemical amperometric gas sensors provide high sensitivity at low cost, and are versatile devices with good stability, short response/recovery time and low power consumption [4][5][6]. Moreover, they operate at room temperature which is required in many applications.…”

Section: Introductionmentioning

confidence: 99%

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Current Fluctuation Measurements of Amperometric Gas Sensors Constructed with Three Different Technology Procedures

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Metrology and Measurement Systems

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Electrochemical amperometric gas sensors represent a well-established and versatile type of devices with unique features: good sensitivity and stability, short response/recovery times, and low power consumption. These sensors operate at room temperature, and therefore have been applied in monitoring air pollutants and detection of toxic and hazardous gases in a number of areas . Some drawbacks of classical electrochemical sensors are overcome by the solid polymer electrolyte (SPE) based on ionic liquids. This work presents evaluation of an SPE-based amperometric sensor from the point of view of current fluctuations. The sensor is based on a novel three-electrode sensor platform with solid polymer electrolytes containing ionic liquid for detection of nitrogen dioxide − a highly toxic gas that is harmful to the environment and presenting a possible threat to human health even at low concentrations. The paper focuses on using noise measurement (electric current fluctuation measurement) for evaluation of electrochemical sensors which were constructed by different fabrication processes: (i) lift-off and drop-casting technology, (ii) screen printing technology on a ceramic substrate and (iii) screen printing on a flexible substrate.

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Section: Fabrication Processes Of Our Amperometric No2 Sensorsmentioning

confidence: 99%