Since the development of potentiometric ion-selective electrodes, remarkable steps have been taken towards progressive simplification and improved robustness of pH sensing probes. In particular, the design of compact sensing architectures using solid-state components holds great potential for portable and wearable applications. Here we report the development of an electrochemically gated device for pH detection, combining the robustness of potentiometric-like transduction with an extremely simple and integrated geometry requiring no reference. The sensor is a two-point probe device comprising two thin polymeric films, i.e. a charge transport layer and a pH-sensitive layer, and exhibits a sensitivity of (8.3 ± 0.2) × 10−3 pH unit−1 in the pH range from 2 to 7. Thanks to the versatility and robustness of the optimised design, a textile pH sensor was fabricated whose performance is comparable with that of glass sensors.
Design of an electrochemically gated organic semiconductor for pH sensing / Federica Mariani, Isacco Gualandi, Domenica Tonelli, Francesco Decataldo, Luca Possanzini, Beatrice Fraboni, Erika Scavetta. - In: ELECTROCHEMISTRY COMMUNICATIONS. - ISSN 1388-2481. - ELETTRONICO. - 116:(2020), pp. 106763.1-106763.8. [10.1016/j.elecom.2020.106763]
Design of an electrochemically gated organic semiconductor for pH sensing
Federica Mariani;Isacco Gualandi;Domenica Tonelli;Francesco Decataldo;Luca Possanzini;Beatrice Fraboni;Erika Scavetta
2020
Abstract
Since the development of potentiometric ion-selective electrodes, remarkable steps have been taken towards progressive simplification and improved robustness of pH sensing probes. In particular, the design of compact sensing architectures using solid-state components holds great potential for portable and wearable applications. Here we report the development of an electrochemically gated device for pH detection, combining the robustness of potentiometric-like transduction with an extremely simple and integrated geometry requiring no reference. The sensor is a two-point probe device comprising two thin polymeric films, i.e. a charge transport layer and a pH-sensitive layer, and exhibits a sensitivity of (8.3 ± 0.2) × 10−3 pH unit−1 in the pH range from 2 to 7. Thanks to the versatility and robustness of the optimised design, a textile pH sensor was fabricated whose performance is comparable with that of glass sensors.File | Dimensione | Formato | |
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