Abstract
The article presents the results of the detection of low-concentration C1–C4 alcohols using a planar sensor, in which a sepiolite filter was applied next to the gas-sensitive layer based on tin dioxide. The sepiolite layer is composed of tubes that have a length of several microns, and the diameter of the single tube ranges from several to tens of nanometers. The sepiolite layer itself demonstrated no chemical activity in the presence of volatile organic compounds (VOC), and the passive filter made of this material did not modify the chemical composition of the gaseous atmosphere diffusing to the gas-sensitive layer. The test results revealed that the structural remodelling of the sepiolite that occurs under the influence of temperature, as well as the effect of the filter (a compound with ionic bonds) with molecules of water, has a significant impact on the improvement of the sensitivity of the sensor in relation to volatile organic compounds when compared to the sensor without a filter.
Highlights
As is well known, chemical resistive gas sensors consist of two basic elements—a receptor part and an actuator part
The article presents the impact of the sepiolite layer, which was used as a physical filter, on the
The article presents the impact of the sepiolite layer, which was used as a physical filter, on the electrical parameters of the thick-layered resistive gas sensor
Summary
Chemical resistive gas sensors consist of two basic elements—a receptor part and an actuator part. Limitations in the of the surface resistive gas sensorscapacity that have and satisfactory performance characteristics result fromcan thebe complex area, a large adsorption a small channel diameter, thisalso compound successfully physical and chemical processes that are difficult to analyse and occur in these types of sensors. This article or presents theemergence studies on sensor thick-film technology, in which compounds, whose determination in exhaled air is important for people who suffer from halitosis a layer of sepiolite—a natural aluminosilicate—was printed on a layer of gas-sensitive material made [13]. 1 to 5 ppm was examined, and the first attempt to analyse the phenomena affecting the operational a layer of sepiolite—a natural aluminosilicate—was printed on a layer of gas-sensitive material made of tinof dioxide This physical filter significantly the parameters of the sensor. Of the developed sensors in atmospheres containing selected C1–C4 alcohols at a concentration of 1 to 5 ppm examined, and the first attempt to analyse the phenomena affecting the operational
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