The Effect of Carbon Nanotubes Solid Contact Dispersing Agent on the Parameters of Resulting Potentiometric Sensors
In this study potassium selective electrodes with CNTs solid contact were prepared. The CNTs transducer layers were obtained by drop casting, using suspensions stabilized with different agents – surafctants as well as complexing ligands. The effect of CNTs suspension stabilizing agent on performance of potentiometric sensors - analytical parameters (sensitivity, selectivity, detection limit) as well as stability of potentiometric responses in time were studied. Potentiometric (open circuit), chronopotentiometric and impedance studies have confirmed that the nature of dispersing agent used as well as its amount used affects performance of the sensor. Dispersing agent used can partition into sensor layers – e.g. ion-selective membrane - significantly altering their properties. Herein obtained results are potentially important for all applications in which CNTs layer are fabricated using stable dispersion of nanomaterial.
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