Spray-Coated All-Solid-State Potentiometric Sensors

Abstract

Recent reports on application of nanostructurized materials for potentiometric sensing purposes point out advantages of novel structures [1]. Here a methods of ions-selective electrodes preparation using solely spray coating method was reported [2]. As an electrical lead support and transducer spray coated CNT layers were used. The ion-selective membrane was coated also by spraying membrane cocktail over a part of a CNTs layer. This method offers significant advantages compared to screen-printed electrodes used also for potentiometric applications [3]. The benefits of the herein-proposed approach include fully automatic sensor preparation and minimized use of chemicals allowing for the production of low-cost sensors that can be applied as disposables. The obtained sensors (as the model system potassium-selective sensors were prepared) are characterized with analytical parameters well comparable with that of conventional, all-solid-state, ion-selective electrodes. In addition, the applicability of the herein-proposed approach to prepare other ion-selective electrodes was tested on examples of H+ and Cl- sensors. REFERENCES 1. A. Düzgün, G.A. Zelada-Guillén, G.A. Crespo, S. Macho, J. Riu, F.X. Rius, Anal. Bioanal. Chem., 2010, 399, 171-181. 2. E. Jaworska, M. Schmidt, G. Scarpa, K. Maksymiuk, A. Michalska, Analyst 2014, 139, 6010-6015. 3. R. Koncki, Ł. Tymecki, E. Zwierkowska and S. Głab, Fresenius. J. Anal. Chem., 2000, 367, 393.