Adsorption–desorption noise in QCM gas sensors

Sedlák, Petr; Šikula, Josef; Majzner, Jiří; Vrňata, Martin; Fitl, Přemysl; Kopecký, Dušan; Vyslouzil, Filip; Händel, Peter

doi:10.1016/j.snb.2012.02.058

Cited by 21 publications

(18 citation statements)

References 15 publications

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“…The fluctuation phenomena in chemical sensors might be divided into two groups [5,7,9]; the first one is directly related to sensor, and the second one is related to the chemical processes in/on a sensing layer.…”

Section: Intrinsic Noise In Amperometric Sensormentioning

confidence: 99%

“…The high-order statistics enables the extraction of non-conventional features and leads to significant improvements in sensor selectivity and sensitivity [5]. Theoretical description of these experimental results is based on an assumption that the adsorption-desorption process represents the dominant noise source in microsensors [7,9]. Gomri et al [6] proposed the model of adsorption-desorption noise in metal oxide gas sensors based on the free electron density fluctuation produced by the gas adsorption considering oxygen chemisorption being involved.…”

Section: Noise Due To Chemical Environmentmentioning

confidence: 99%

“…Gomri et al [6] proposed the model of adsorption-desorption noise in metal oxide gas sensors based on the free electron density fluctuation produced by the gas adsorption considering oxygen chemisorption being involved. In our paper on noise in QCM [9], another model of adsorption-desorption noise was proposed based on Kolmogorov equation for interaction between two reservoirs.…”

Section: Noise Due To Chemical Environmentmentioning

confidence: 99%

“…However, these fluctuation mechanisms may also contain useful information concerning the physical or chemical processes occurring in the sensor. Noise measurements might give us additional information about issues in suitable sensor design, used contact, applied manufacturing process etc [1][2][3], but also analyses of noise measurements represent the approach of extracting more selective response from the chemical sensors, such as conductometric sensors [4][5][6][7], surface acoustic wave sensors [8] and resonant sensors [9].…”

Section: Introductionmentioning

confidence: 99%

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Noise in amperometric NO2 sensor

Sedlák

Šikula

Sedláková

et al. 2013

2013 22nd International Conference on Noise and Fluctuations (ICNF)

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Nitrogen dioxide (NO2) is a highly toxic gas harmful to the environment, which can be threat to human health even at low concentrations. To overcome limitations of standard solid NO2 sensors based on inorganic materials, a new sensor with solid polymer electrolytes (SPE) was developed. Our study deals with investigation of fluctuation phenomena in the electrochemical NO2 sensor, which is based on three-electrode topology and solid polymer electrolyte. Experimental result shows that generation-recombination (G-R) noise seems to be main components of current fluctuations in this sensor. The concentration of detected matter affects noise spectral density of sensor. As the concentration increases, G-R noise rises and is supposed to be connected with chemical processes on active layer of sensor. The shift of G-R component is supposed to be caused by increased flux density between active layer and environment.

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Section: Intrinsic Noise In Amperometric Sensormentioning

confidence: 99%

Section: Noise Due To Chemical Environmentmentioning

confidence: 99%

Section: Noise Due To Chemical Environmentmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Noise in amperometric NO2 sensor

Sedlák

Šikula

Sedláková

et al. 2013

2013 22nd International Conference on Noise and Fluctuations (ICNF)

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“…An increased level of noise or unusual shape of the noise spectra usually indicate failure mechanisms in particular devices [14][15][16][17][18]. Several authors showed that fluctuation analysis enables to extract a more selective response from the chemical sensors, [19][20][21][22][23][24], surface acoustic wave sensors, and resonant sensors [25,26].…”

Section: Introductionmentioning

confidence: 99%

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

Sedlák

Kuberský

Škarvada

et al. 2016

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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