By Korotchenkov, G. S.
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Additional info for Chemical Sensors : Comprehensive Sensors Technologies
The sensors are often able to be calibrated and provide useful sensing performance, but understanding the molecular and chemical reaction basis for the signal is more difficult. Interestingly, the amperometric sensor signal will get smaller with the size of the electrode because of the decreasing rate of analyte reaction at the electrode surface, while the potentiometric sensor has no such dependence on geometry. This situation becomes most interesting in nanostructures, in which the thermodynamic potential can be characteristic of aggregates of atoms and different from a bulk system of components.
POTENTIOMETRIC GAS SENSORS In the ideal condition, potentiometric sensors are sensors based on thermodynamic equilibrium for specific electrochemical reactions involving a redox reaction. Examples include ion sensors or ion-selective 20 CHEMICAL SENSORS. 10. Schematic diagram of the polymer/acid electrolyte AGS for hydrogen. (Reprinted with permission from Korotcenkov 2009. ) electrodes (ISEs) that are based on redox or ion-exchange reactions (Holzinger et al. 1997; Yamazoe and Miura 1998; Bobacka et al.
Each part of the sensor influences the overall performance and analytical characteristics of the sensor. Therefore, it is often the major goal of research efforts to find the link between the analytical performance of the electrochemical sensor and the construction/design and materials from which the sensor is made, as well as the many factors included in the testing of the sensor, such as mass transfer of the analyte to the electrode. Choosing appropriate materials for sensor construction and selecting an efficient sensor geometry is critical to obtaining optimal sensor operation and performance.
Chemical Sensors : Comprehensive Sensors Technologies by Korotchenkov, G. S.