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The Effect of the Orientation Towards Analyte Flow on Electrochemical Sensor Performance and Current Fluctuations

1
Faculty of Electrical Engineering and Communications, Brno University of Technology, Technická 10, Brno 616 00, Czech Republic
2
Faculty of Electrical Engineering, Regional Innovation Centre for Electric Engineering, University of West Bohemia, Univerzitni 8, Plzen 301 00, Czech Republic
*
Author to whom correspondence should be addressed.
Sensors 2020, 20(4), 1038; https://doi.org/10.3390/s20041038
Received: 21 January 2020 / Revised: 7 February 2020 / Accepted: 13 February 2020 / Published: 14 February 2020
(This article belongs to the Section Chemical Sensors)
Analyte flow influences the performance of every gas sensor; thus, most of these sensors usually contain a diffusion barrier (layer, cover, inlet) that can prevent the negative impact of a sudden change of direction and/or the rate of analyte flow, as well as various unwanted impacts from the surrounding environment. However, several measurement techniques use the modulation of the flow rate to enhance sensor properties or to extract more information about the chemical processes that occur on a sensitive layer or a working electrode. The paper deals with the experimental study on how the analyte flow rate and the orientation of the electrochemical sensor towards the analyte flow direction influence sensor performance and current fluctuations. Experiments were carried out on a semi-planar, three-electrode topology that enabled a direct exposure of the working (sensing) electrode to the analyte without any artificial diffusion barrier. The sensor was tested within the flow rate range of 0.1–1 L/min and the orientation of the sensor towards the analyte flow direction was gradually set to the four angles 0°, 45°, 90° and 270° in the middle of the test chamber, while the sensor was also investigated in the standard position at the bottom of the chamber. View Full-Text
Keywords: analyte flow; current fluctuations; amperometric sensor; signal-to-noise ratio analyte flow; current fluctuations; amperometric sensor; signal-to-noise ratio
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Sedlák, P.; Kuberský, P. The Effect of the Orientation Towards Analyte Flow on Electrochemical Sensor Performance and Current Fluctuations. Sensors 2020, 20, 1038.

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