Electrogenerated Chemiluminescence for Potentiometric Sensors
journal contributionposted on 22.02.2016, 09:17 by Gastón A. Crespo, Günter Mistlberger, Eric Bakker
We report here on a generic approach to read out potentiometric sensors with electrogenerated chemiluminescence (ECL). In a first example, a potassium ion-selective electrode acts as the reference electrode and is placed in contact with the sample solution. The working electrode of the three-electrode cell is responsible for ECL generation and placed in a detection solution containing tris(2,2′-bipyridyl)ruthenium(II) [Ru(bpy)32+] and the coreactant 2-(dibutylamino)ethanol (DBAE), physically separated from the sample by a bridge. Changes in the sample potassium concentration directly modulate the potential at the working electrode, and hence the ECL output, when a constant-potential pulse is applied between the two electrodes. A linear response of the ECL intensity to the logarithmic potassium concentration between 10 μm and 10 mM was found.
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electrogenerated chemiluminescenceECL outputsample potassium concentrationreference electrodeconstant-potential pulsethree-electrode cellDBAElogarithmic potassium concentrationElectrogenerated Chemiluminescencedetection solution10 mMsample solutionpotassium ion-selective electrode actsPotentiometric SensorsECL intensityECL generationpotentiometric sensors10 μ m