Abstract
Chemical sensing is part of an information-acquisition process in which an insight is obtained about the chemical composition of the system in real-time. In this process, an amplified electrical signal results from the interaction between some chemical species and the sensor. Generally, the interaction consists of two steps: recognition and amplification. One common example is the measurement of pH with a glass electrode electrode (Fig. 1.1).
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Abbreviations
- a :
-
Activity
- C :
-
Concentration
- \(E_{out}\) :
-
Output signal (voltage)
- F :
-
Faraday's constant \((96{,}485\,{\rm C\ mol}^{-1})\)
- f :
-
Activity coefficient
- \(\Delta G^0\) :
-
Standard free energy
- K :
-
Equilibrium constant
- \(K_{i}\) :
-
Binding constant for interferant i
- \(K_{i}^{\prime}\) :
-
Selectivity coefficient for interferent i
- k :
-
Reaction rate
- m :
-
Sensitivity
- n :
-
Number of moles
- R :
-
Gas constant \((8.314\,{\rm J\ K}^{-1}\ {\rm mol}^{-1})\)
- \(\Re_{\rm f}\) :
-
Transduction function
- T :
-
Temperature
- z :
-
The charge of a species
- μ:
-
Chemical potential
- σ:
-
Standard deviation of the response
- γ:
-
Analytical sensitivity
Reference
Barsan, N., Stetter, J., and Gopel, W. (1999) Anal. Chem. 71, 2512.
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© 2009 Springer Science+Business Media, LLC
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Janata, J. (2009). Introduction to Sensors. In: Principles of Chemical Sensors. Springer, Boston, MA. https://doi.org/10.1007/b136378_1
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DOI: https://doi.org/10.1007/b136378_1
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