By Korotchenkov, G. S.
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3. BF4−-doped polythiophene (PTh). (Reprinted with permission from Mohammad 1998. ) 2009), and some other reducing gases (H2, NH3, liquefied petroleum gases or LPG) can be oxidized by surface-bound oxygen ions (O−, O2−, O2−) on the sensor surface, increasing the charge of the conduction band of an n-type semiconductor. Some gas sensors have been used to study this phenomenon (Biswas et al. 2008). 4. Partial redox CO sensor in which the conductivity of the PNA electrolyte increased with CO concentration as the CO/PAN interaction produced more charge carriers.
Many reviews have been written about the conductometric types of gas sensors (Potje-Kamloth 2008). 3. TYPES OF GASEOUS INTERACTIONS IN SENSING In this section, we will survey the electrochemical gas sensors from a new point of view: the specific interaction between the analyte gases and the sensors. As we are going to talking about specific interactions, we will not cover electronic noses or gas sensor arrays, where each single interaction might be more or less specific. The gas/sensor interactions in electrochemical sensors fall into two categories, depending on 8 CHEMICAL SENSORS.
CONDUCTIVITY/RESISTANCE AND CONDUCTOMETRY Conductometry is one of the most commonly used sensing methods for gases. , the conductivity of the active materials, in the presence and absence of analyte(s), are used to determine the components and concentrations. Therefore, the target analytes for a conductometric gas sensor will cause changes of charge carrier density or mobility in the active materials, leading to significant alterations in their conductivity. This process can be related to the surface reactions (Stetter 1978).
Chemical Sensors : Comprehensive Sensors Technologies by Korotchenkov, G. S.