The stop-flow mode of operation applied to a single chemiresistor

Szczurek, Andrzej; Maciejewska, Monika; Flisowska-Wiercik, B.; Bodzoj, L.

doi:10.1016/j.snb.2010.05.009

Cited by 12 publications

(9 citation statements)

References 20 publications

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“… 5 − 7 Multielement arrays can offer increased recognition capabilities in complex mixtures via the use of multiple cross-selective sensing materials (and multiple operational modes), and nanostructured materials have helped to provide higher target sensitivity within these microdevices. There have also been advances in enhancing signal information content for better performance through the use of modulation techniques for individual chemiresistors or e-nose elements, which can include, for example, operating-temperature modulation, 8 − 13 gas-delivery modulation, 14 , 15 and analysis of the resultant transient signals. 16 − 18 Considerably less attention has been focused, however, on increasing the speed with which microsensors can report on the introduction, presence, and concentration of analytes within a sampled volume.…”

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confidence: 99%

Demonstration of Fast and Accurate Discrimination and Quantification of Chemically Similar Species Utilizing a Single Cross-Selective Chemiresistor

et al. 2014

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Performance characteristics of gas-phase microsensors will determine the ultimate utility of these devices for a wide range of chemical monitoring applications. Commonly employed chemiresistor elements are quite sensitive to selected analytes, and relatively new methods have increased the selectivity to specific compounds, even in the presence of interfering species. Here, we have focused on determining whether purposefully driven temperature modulation can produce faster sensor-response characteristics, which could enable measurements for a broader range of applications involving dynamic compositional analysis. We investigated the response speed of a single chemiresitive In2O3 microhotplate sensor to four analytes (methanol, ethanol, acetone, 2-butanone) by systematically varying the oscillating frequency (semicycle periods of 20–120 ms) of a bilevel temperature cycle applied to the sensing element. It was determined that the fastest response (≈ 9 s), as indicated by a 98% signal-change metric, occurred for a period of 30 ms and that responses under such modulation were dramatically faster than for isothermal operation of the same device (>300 s). Rapid modulation between 150 and 450 °C exerts kinetic control over transient processes, including adsorption, desorption, diffusion, and reaction phenomena, which are important for charge transfer occurring in transduction processes and the observed response times. We also demonstrate that the fastest operation is accompanied by excellent discrimination within a challenging 16-category recognition problem (consisting of the four analytes at four separate concentrations). This critical finding demonstrates that both speed and high discriminatory capabilities can be realized through temperature modulation.

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confidence: 99%

Demonstration of Fast and Accurate Discrimination and Quantification of Chemically Similar Species Utilizing a Single Cross-Selective Chemiresistor

et al. 2014

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“…The responses of the all sensors, elements of the gas sensor array, were utilized. The employed approach to feature vector formation was based on the results of earlier works on gas sensor measurements using the dynamic mode of operation [ 37 , 38 , 39 , 55 ]. In particular, it was demonstrated by Szczurek et al [ 37 , 38 , 39 ] that the first several minutes of gas sensor exposure to beehive air were sufficient to attain the effective classification of V.d.…”

Section: Methodsmentioning

confidence: 99%

The Effectiveness of Varroa destructor Infestation Classification Using an E-Nose Depending on the Time of Day

Szczurek

Maciejewska

Zajiczek

et al. 2020

Sensors

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Honey bees are subject to a number of stressors. In recent years, there has been a worldwide decline in the population of these insects. Losses raise a serious concern, because bees have an indispensable role in the food supply of humankind. This work is focused on the method of assessment of honey bee colony infestation by Varroa destructor. The approach allows to detect several categories of infestation: “Low”, “Medium” and “High”. The method of detection consists of two components: (1) the measurements of beehive air using a gas sensor array and (2) classification, which is based on the measurement data. In this work, we indicate the sensitivity of the bee colony infestation assessment to the timing of measurement data collection. It was observed that the semiconductor gas sensor responses to the atmosphere of a defined beehive, collected during 24 h, displayed temporal variation. We demonstrated that the success rate of the bee colony infestation assessment also altered depending on the time of day when the gas sensor array measurement was done. Moreover, it was found that different times of day were the most favorable to detect the particular infestation category. This result could indicate that the representation of the disease in the beehive air may be confounded during the day, due to some interferences. More studies are needed to explain this fact and determine the best measurement periods. The problem addressed in this work is very important for scheduling the beekeeping practices aimed at Varroa destructor infestation assessment, using the proposed method.

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“…The detailed description of all elements of the experimental setup was presented in our earlier paper [8].…”

Section: Methodsmentioning

confidence: 99%

“…The two indicators were calculated for each combination of sensors at each time point of sensor array response in the stop-flow mode. For the detailed description of the applied discrimination and quantification methods the reader is referred to our earlier paper [8].…”

Section: Methods Of Discrimination and Quantificationmentioning

confidence: 99%

Sensor array and stop-flow mode applied to discrimination and quantification of gas mixtures

Maciejewska

Szczurek

Bodzoj

et al. 2010

Sensors and Actuators B: Chemical

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The stop-flow mode of operation applied to a single chemiresistor

Cited by 12 publications

References 20 publications

Demonstration of Fast and Accurate Discrimination and Quantification of Chemically Similar Species Utilizing a Single Cross-Selective Chemiresistor

Demonstration of Fast and Accurate Discrimination and Quantification of Chemically Similar Species Utilizing a Single Cross-Selective Chemiresistor

The Effectiveness of Varroa destructor Infestation Classification Using an E-Nose Depending on the Time of Day

Sensor array and stop-flow mode applied to discrimination and quantification of gas mixtures

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