Optimizing Carbon Nanotubes Dispersing Agents from the Point of View of Ion-selective Membrane Based Sensors Performance - Introducing Carboxymethylcellulose as Dispersing Agent for Carbon Nanotubes Based Solid Contacts

摘要

The influence of dispersing agent used to prepare carbon nanotubes solid-contact on the performance of all-solid state ion-selective electrodes has been evaluated. It is shown that excess of surfactant dispersing agent is leading to deterioration of sensor performance, however, removal of dispersing agent - a typically applied approach - is resulting in substantial change of transducer layer physical properties, which can influence sensor performance. As remedy we propose application of a polymeric dispersing agent - carboxymethylcellulose. Thus obtained ion-selective electrodes are characterized by high potential readings stability both within day and between days.