Acid-assisted polymerization: the novel synthetic route of sensing layers based on PANI films and chelating agents protected by non-biofouling layer for Fe2+ or Fe3+ potentiometric detection. Issue 7 (24th January 2023)

• Record Type: Journal Article
• Authors: Ismail, Rimeh; Šeděnková, Ivana; Svoboda, Jan; Lukešová, Miroslava; Walterová, Zuzana; Tomšík, Elena
• Is Part Of: Journal of materials chemistry. Volume 11:Issue 7(2023)
• Page Start: 1545
• Page End: 1556
• Publication Date: 2023-01-24
• Subjects: Materials -- Periodicals; Chemistry, Analytic -- Periodicals; Biomedical materials -- Research -- Periodicals; 543.0284
• DOI: 10.1039/d2tb02450k
• Languages: English
• ISSNs: 2050-750X

Abstract

Abstract : It is shown for the first time that PANI could be synthesized by acid-assisted polymerization, which gives the stable PANI suspension. PANI suspension can be deposited on any surface with the formation of reproducible and stable film for biosensor application. Abstract : A new synthetic method for the fabrication of a sensing layer is presented. PANI films as an ion-to-electron transducer were prepared via acid-assisted polymerization in concentrated formic acid (HCOOH) in the presence of ethanol and ammonium persulfate (APS, as the initiator). The ratio of monomer to ammonium persulfate was 1 : 0.1. 2, 2-Bipyridyl, 1, 10-phenanthrolin-5-amine, and 8-hydroxyquinoline were used as chelating agents that can complex Fe 2+ or Fe 3+ ions. The proposed sensors demonstrated an appropriate reproducibility with a rapid response to the presence of Fe 2+ or Fe 3+ ions, even at T ∼ 37 °C. It was revealed that the method of deposition of a chelating molecule affects the response of sensors. The in situ deposition during acid-assisted polymerization leads to a fast response compared to the layer-by-layer deposition. PMeOx/X1 -PANI@FTO and PMeOx/Z1 -PANI@FTO sensors exhibit rapid response and are considered a promising detection layer for Fe 2+ or Fe 3+ ions respectively. We envision that this system can contribute to the next generation of advanced bio-sensors for the potentiometric detection of iron.